JPH069286B2 - Laser device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dye laser using a dye as a laser substance, and more particularly to a laser device which performs multi-wavelength laser oscillation.

[Conventional technology]

FIG. 6 shows, for example, Optics Communications Unications 19
Volume 73, page 233 (Optics Communications vo
FIG. 17 is a diagram showing a conventional multi-wavelength oscillation laser device shown in 1723 (1973)). In the figure, 101 is a dye solution 101 composed of a dye as a laser substance and a solvent.
A transparent dye container containing A, 102 has a wavelength λ ′ ₁ ,
An output mirror for outputting each laser beam of λ ′ ₂ and used for an optical resonance system, 103 is an output mirror for the dye container 101.
Is a beam splitter disposed on the side opposite to the side on which is disposed. Reference numeral 104 is a diffractive outer element disposed at a position where the light wave reflected by the beam splitter 103 is incident and diffracted and reflected with high reflectance. , 105 are beam splitters 10.
3 is a diffraction grating arranged at a position where the light wave transmitted through 3 is incident and diffracted and reflected with a high reflectance. If necessary,
A polarizer, an ND filter or a beam expander is arranged between the beam splitter 103 and the diffraction grating 104 and between the beam splitter 103 and the diffraction grating 105. A dye container 101 containing the dye solution 101A,
The output mirror 102, the bead splitter 103, and the dye container 104 constitute an optical resonator for a light wave of wavelength λ ′ ₁ .
Dye container 101 containing dye solution 101A, output mirror 10
2, the optical resonator is configured for light waves having a wavelength lambda _'2 between the beam splitter 103 and the diffraction grating 105.

Next, the operation will be described. The pumping light 106 output from the pumping light source (not shown) and focused by the optical system (not shown) is the dye container 101 in the dye container 101.
Irradiate A. As a result, the dye in the dye solution 101A is in an inverted distribution state, and a light wave in a specific wavelength region is generated from the dye. Here, the diffraction grating 104 is rotationally adjusted so that the reflectance of the light wave having the wavelength λ ′ ₁ becomes maximum with respect to the light wave incident on the diffraction grating 104. Further, the diffraction grating 105 is rotationally adjusted so that the reflection mirror of the light wave having the wavelength λ ′ ₂ becomes maximum with respect to the light wave incident on the diffraction grating 105. Wavelength λ ′
The light wave of ₁ is laser-oscillated by the above-mentioned optical resonator composed of the components from the output mirror 102 to the diffraction grating 104, and the light wave of wavelength λ ′ _{2 is} the light composed of the constituent components from the output mirror 102 to the diffraction grating 105. Laser oscillation is generated by the resonator.
Wavelength λ _'1, λ' wavelengths λ _'1, λ' is a part of the light wave ₂ emitted from the output mirror 102 of ₂ as a laser beam having respectively.

[Problems to be solved by the invention]

Since the conventional laser device that oscillates light waves of multiple wavelengths is configured as described above, the wavelength region of the oscillating light wave is determined by a single dye solution in a single dye container, and the region up to 80 nanometers (80 nm) approximately has the disadvantage (the difference between the wavelength lambda _'1 the same lambda' ₂ is approximately within 80 nm) only possible, also in order to multi-wavelength oscillation at the same dye solution, oscillation lightwave by retraction phenomenon like The interaction between them is strong,
There is a problem that the output power, output wavelength, oscillation timing, etc. cannot be stabilized, and because the beam splitter is used, the loss of the oscillation light wave is large and a laser beam of sufficient intensity cannot be obtained.

The present invention has been made to solve the above-mentioned problems, and a plurality of wavelengths having wavelength intervals exceeding wavelength regions of light waves obtained by pumping a single dye having a single concentration. It is an object of the present invention to obtain a laser device capable of performing laser oscillation of the above-mentioned light waves, weakening the interaction between the respective oscillation light waves, performing stable laser oscillation, and obtaining laser light of sufficient intensity.

[Means for solving problems]

In the laser device according to the present invention, a plurality of dye containers are arranged in series at intervals, and a semi-transparent mirror-like output mirror is arranged on one side of the dye container group to emit laser light and used for laser oscillation. A reflecting mirror having a window in the portion is disposed so as to be inclined between the dye containers, and the first wavelength selecting means selectively directs light having a specific wavelength of light reflected by the reflecting mirror to the reflecting mirror side with high reflectance. The second wavelength selecting means, which is arranged at a reflecting position and is arranged on the other side of the dye container group, selectively outputs the light having a specific wavelength of the light passing through all the windows of the reflecting mirror to the output mirror by the high reflecting mirror. Reflected toward, the dye solution consisting of a dye and a solvent is housed in the dye container and arranged so as to generate a light wave light having a short laser oscillation wavelength by pumping in the order close to the output mirror,
A pumping means is arranged at a position where each dye solution is irradiated with pumping light.

A laser device according to another invention of the present invention is provided with an output mirror for emitting a laser beam and for oscillating a laser, and a reflecting mirror having a light-transmissive window in a central portion is tilted at a distance from the output mirror. And a transparent first dye container having a through hole provided corresponding to the window of the reflecting mirror is arranged next to and adjacent to the output mirror as seen from the reflecting mirror. A second dye container having an optical property is arranged at a position sandwiching the reflecting mirror with the output mirror,
The first wavelength selecting means is arranged so as to selectively reflect the light of a specific wavelength of the light reflected by the reflecting mirror with a high reflectance,
Second wavelength selecting means for selectively reflecting light having a specific wavelength of light passing through all windows of the reflecting mirror with high reflectance is arranged at a position sandwiching the second dye container with the output mirror, and pumping is performed. A dye solution containing a dye and a solvent that generate excitation light is stored in each of the first and second dye containers, and the pumping means is arranged at a position for irradiating each dye solution with the pumping light.

[Action]

Since each of the dyes in the plurality of dye containers in the present invention is arranged at a position closer to the output mirror as the laser oscillation wavelength is closer to the short wavelength side in the wavelength region of the excitation light generated by pumping, Since the wavelength of the oscillating light wave exists on the longer wavelength side than the wavelength region where the dye in the preceding stage has high light absorption, this allows the oscillating light wave to pass without being absorbed, so the width of the multi-wavelength existence region of the oscillating light wave is extremely large. It can be made large, weakens the interaction between the oscillated light waves, enables stable laser oscillation of multiple wavelengths, and the windowed reflector in this invention does not weaken the intensity of light passing through the reflector. It is possible to obtain a laser beam having a sufficient intensity.

Further, the through-hole of the dye container and the window of the reflecting mirror in the other invention of this invention are made independent of the dye solution of the preceding stage by passing the oscillation light wave by the dye solution of the latter stage, and what kind of laser dye solution Even when placed in a dye container, it is possible to stably oscillate multiple wavelengths using the same central axis, and there is no absorption loss of the oscillated light wave by the dye solution or transmission loss due to the window, so that a laser of sufficient intensity can be obtained, Moreover, since the dye solution can be arbitrarily selected, the wavelength difference between the laser beams can be increased by increasing the wavelength difference between the light waves.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
The figure shows the configuration of the laser device of the present invention.
Reference numeral 1 is a translucent first dye container containing a first dye solution 1A composed of a well-known first dye as a laser material for generating a first light wave having a wavelength λ ₁ and a solvent, and 2 is a wavelength λ ₂ Well-known second dye as a laser substance for generating the second light wave of
A second translucent second dye container containing a second dye solution 2A from a solvent (not the first dye) and a solvent, and the first and second dye containers 1 and 2 are arranged in series at intervals. ing. It should be noted that a combination of dyes such that the wavelength λ ₁ of the first light wave is shorter than the wavelength λ ₂ of the second light wave is housed in the first and second dye containers 1 and 2, respectively, and the wavelengths λ ₁ and λ ₂ Is larger than the maximum wavelength difference between the laser beams emitted by the multi-wavelength laser by a single solution of a single dye. Reference numeral 3 is a semi-transparent mirror-shaped output mirror that is arranged to face the first dye container 1.
It emits laser light corresponding to the first and second light waves having wavelength input ₁ and wavelength λ ₂ , respectively, and is used for laser oscillation of these light waves. Reference numeral 4 denotes a windowed reflecting mirror having a window 4A made of a hole or a translucent member in the central portion.
It is arranged between the second dye container 1 and the second dye container 1, and its reflection surface faces the reflection surface of the output mirror 3 with an inclination.
Reference numeral 5 is a _first position arranged to selectively enter / reflect the light wave of wavelength λ ₁ reflected by the window reflection mirror 4 with high reflectance.
In this embodiment, the Littrow type first diffraction grating is used. Reference numeral 6 is a second wavelength selection position arranged at a position for selectively entering / reflecting the light wave reflectance of the wavelength λ ₂ reflected by the output mirror 3 and passing through the window 4A and adjacent to the second dye container 2. In this embodiment, the Littrow type second diffraction grating is used. 7
a and 7b are the first in the first and second dye containers 1 and 2.
And pumping light that pumps the second dye respectively,
The pumping light 7a is incident on the first dye solution 1A from the side as shown, and the pumping light 7b is incident on the second dye solution 2A from the side as shown.

The laser device configured to oscillate a multi-wavelength light wave as described above includes a first mirror including the output mirror 3 and the first dye solution 1A.
The dye container 1, the reflecting surface of the windowed reflecting mirror 4 and the first diffraction grating 5 constitute a first optical-wave resonator 8 for oscillating a light wave having a wavelength λ ₁ , and an output mirror 3 and a first dye solution 1A are included. The dye container 1, the window 4A of the dense reflection mirror 4, the second dye container 2 containing the second dye solution 2A, and the diffraction grating 6 constitute the second optical resonator 9 for oscillating wavelength λ ₂ . .

FIG. 2 shows pumping means of the laser device for generating the pumping lights 7a and 7b shown in FIG. In FIG. 2 (A), reference numeral 10 denotes any of a flash lamp, a Q-switched ruby laser, a second harmonic generation source thereof, a second ultraviolet generation source of a molecular ultraviolet laser and a YAG laser, etc. which generate pumping light 7. One of them is a pumping light source, 11 is a beam splitter that splits the pumping light 7 emitted from the pumping light source 10 into pumping lights 7a and 7b, and 12 is a pumping light 7b that is reflected by the beam splitter 11 and is split. Total reflection mirrors directed in the same direction as the pumping light 7a, and 13a and 13b are cylindrical lenses that linearly collect the pumping light 7a transmitted through the beam splitter 11 and the pumping light 7b reflected by the total reflection mirror 12, respectively. . The first and second dye solutions 1A and 2 shown in FIG. 1 are placed at the respective focusing positions of the pumping lights 7a and 7b by the cylindrical lenses 13a and 13b.
The first and second dyes of A are arranged. Fig. 2 (B)
10, 10 is a first pumping light source, 14 is a second pumping light source, and 15 is that the first pumping light source 10 and the second pumping light source 14 emit the pumping lights 7a and 7c in synchronization with each other. The connection lines for synchronization used for the cylindrical lenses 13a and 13b are the pumping light 7
Collect a and 7c respectively. In the case of this embodiment, the pumping means shown in FIG. 2 (A) is used, but when the pumping means shown in FIG. 2 (B) is applied to FIG. Pumping light 7b pumping light 7c
You can replace it with. When a helical flash lamp is used as the pumping light source, the cylindrical lens 1
3a and 13b are unnecessary. Of course, the dye containers 1 and 2 are arranged in the helical flash lamp. Further, the flash lamp may be of a helical type whose number corresponds to the number of dye containers.

Next, the operation of the present invention will be described. Pumping light source 10
The pumping light 7 emitted from is split into two pumping lights 7a and 7b by the beam splitter 11. The pumping light 7a is condensed by the cylindrical lens 13a, and at the same time, the pumping light 7b is totally reflected by the total reflection mirror 12 and condensed by the cylindrical lens 13b. These collected pumping lights 7a and 7b are used as the first and second dye solutions 1A,
Each dye of 2A is simultaneously irradiated. This makes the first
The first and second dyes of the second dye solutions 1A and 2A are in a population inversion distribution, and the first and second dyes emit excitation light in their respective wavelength regions. The first dye of the first solution 1A generates a light wave including the first light wave of the wavelength λ ₁ , and the second dye of the second solution 2A generates a light wave including the second light wave of the wavelength λ ₂ . The first light wave of wavelength λ ₁ is selectively reflected by the diffraction grating 5 and laser-oscillates in the first light wave oscillation optical resonator 8, and a part of the light is emitted from the output mirror 3 as laser light of wavelength λ _1. To do. The second light wave having the wavelength λ ₂ is selectively reflected by the diffraction grating 6 and then the second light wave oscillation optical resonator 9
Laser oscillation occurs inside, and a part of the light is emitted from the output mirror 2 as laser light having a wavelength λ ₂ . It should be noted that the first wavelength λ ₁
The light wave is output mirror 3 first dye solution 1A and first dye container 1 reflection surface of pumping window reflection mirror 4 first diffraction grating 5
The laser is oscillated by repeatedly passing between the paths. Also, the wavelength λ
_2nd light wave of 2 is output mirror 3 1st dye solution 1A and 1st dye solution
Dye container 1 Window 4A of reflecting mirror 4 with window Second dye solution 2
Laser oscillation is caused by repeatedly passing between the paths of A and the second diffraction grating 6 of the second dye container.

Here, the absorption spectrum and the fluorescence spectrum of the singlet of the dye as the laser substance generally have the characteristics as shown in FIG. 3, and the wavelength range near the peak of the fluorescence spectrum for laser oscillation is shorter than the wavelength range. There is an absorption spectrum.
Therefore, assuming that the spectral characteristics shown in FIG. 3 are the characteristics of the second dye of the second dye solution 2A, the absorption and fluorescence spectra of the first dye of the first dye solution 1A show the spectrum curve of FIG. It is similar to the characteristic curve moved to the side.
Therefore, the laser oscillation wavelength λ of the second light wave obtained by oscillating the excitation light of the second dye of the second dye solution 2A within the wavelength region of the portion of the first dye solution 1A where the first dye has a high light absorption rate.
₂ never enters. Therefore, the second light wave of the wavelength λ ₂ reaches the output mirror 3 without being absorbed by the first dye of the first dye solution 1A, is partially reflected, and is partially reflected between the diffraction gratings 6 to generate the second light wave oscillation light. A resonance system is formed, and the oscillation operation is performed as if the first dye solution 1A in the first dye container 1 does not exist.

Thus, the first optical wave and a respective separate the second light wave first and second dye solution 1A, the first and second dye 2A because as each occurs, the wavelength lambda ₁ of the first light wave first Two
A large difference from the wavelength λ ₂ of the light wave can be taken, and the interaction between the oscillating light waves can be weakened. Therefore, the output mirror 3
It is possible to realize an optical resonance system that can generate light waves of different wavelengths on the same axis independently of each other in common, and stably perform multi-wavelength laser oscillation.

As described above, laser oscillation is performed with different dyes in the first and second dye containers 1 and 2 in an inverted distribution state, so that a laser beam having a large difference between the two wavelengths λ ₁ and λ ₂ is output. Can simultaneously emit light from the same central axis.

Although different dye solutions are used in the above-mentioned embodiments, different dyes of the same kind are used in different solvents or different concentrations to obtain laser light with a large difference between the wavelengths λ ₁ and λ _2. You can also

FIG. 4 shows another embodiment of the present invention. In FIG.
Reference numeral 6 denotes a first dye container having a double-cylinder shape and having a through hole 17 in the center thereof. The first dye solution 1A is annularly formed between the double cylinders.
Are housed. The difference from the laser device shown in FIG.
The point is that a first dye container 16 is arranged in place of the first dye container 1 at the position of the first dye container 1 shown in the figure. The through hole 17, the window 4A and the second dye solution 2A are arranged so that the same light can pass therethrough. Reference numeral 18 denotes a first lightwave oscillation light having a wavelength λ ₁ , which is composed of the output mirror 3, the first dye container 16 containing the first dye solution 1A, the reflecting surface of the windowed reflecting mirror 4 and the first diffraction grating 5. Resonator, 19 is output mirror 3,
Through hole 17 of first dye container 16, window 4 of reflecting mirror 4 with window
A, the second dye container 2 containing the second dye solution 2A and the second
It is an optical resonator for second light wave oscillation having a wavelength λ ₂ configured with a diffraction grating 6.

In this embodiment, the second light wave of wavelength λ ₂ oscillated by the optical resonator 19 passes through the through hole 17 and does not pass through the first dye solution 1A.
The effect of A on the second light wave of the first dye need not be taken into consideration at all. In addition, the first and second dye solutions 1A and 2A
Even if the same dye is used for the above, it is possible to oscillate the first and second light waves having a large wavelength interval by making each concentration of the solution and / or the solvent different.

Regarding the operation of this embodiment, the pumping light 7a, 7b is simultaneously applied to the first and second solutions 1A, 2A by the pumping means shown in FIG. 2 (A). As a result, within the excitation light generated from the first dye of the first solution 1A, the light wave of wavelength λ ₁ laser-oscillates in the optical resonator 18, and within the excitation light generated from the second dye of the second solution 2A. The light wave of wavelength λ ₂ oscillates in the optical resonator 19, and the laser light of wavelength λ _{2 and} the laser light of wavelength λ ₁ are simultaneously emitted from the output mirror 3 on the same central axis.

FIG. 5 shows another embodiment of the present invention.
20 is a window 20A having a hole or a transparent member in the center
And a concave mirror with a window 21 disposed between the first dye container 1 and the second dye container 2 such that the axis of the output mirror 3 is obliquely entered with respect to the plane reflection surface of the output mirror 3. Concave mirror 2
A concave lens is arranged near the position where the light reflected by 0 converges and makes the light incident into parallel light. Reference numeral 22 denotes a light highly reflective by selectively diffracting the light emitted from the concave lens 21 at a specific wavelength. It is a diffraction grating as a wavelength selection means arranged at a position where it is reflected toward the concave lens 21 at a high index. Other components having the same reference numerals as those in FIG. 1 are configured in the same manner as in the conventional example. In addition, 23 is an output mirror, the 1st dye solution 1
A and the first dye container 1, the reflection surface of the concave mirror 20, the concave lens 21 and the diffraction grating 22 for the optical resonator for the light wave of the wavelength λ ₁ , 24 is the output mirror, the first dye solution 1A and the first dye container 1. An optical resonator for a light wave having a wavelength λ ₂ composed of a window 20A of a concave mirror 20, a second dye solution 2A, a second dye solution 2 and a diffraction grating 6, and in the case of this embodiment, a reflecting surface of the concave mirror 20 The light flux reflected by is narrowed down and is incident on the small concave lens 20, and the concave lens 21 is emitted as parallel light to the small diffraction grating 22. Therefore, it is possible to realize a small laser device as compared with the laser device shown in FIG. You can Further, instead of the first dye container 1 shown in FIG. 5, the first dye container 16 shown in FIG.
It is of course possible to apply

Although a diffraction grating is used as the wavelength selection means in each of the above-mentioned embodiments, instead of this, the light of a specific wavelength directed in a specific direction from the prism is reflected to the prism side again by the total reflection mirror by utilizing the spectrum by the prism. It goes without saying that the wavelength selecting means may be configured such that the wavelength selecting means is returned. Also, in FIG.
Also in each of the embodiments shown in FIG. 5, a polarizer, N, etc. may be provided at a position corresponding to the position shown by the alternate long and short dash line in the embodiment of FIG.
A D filter or a beam expander may be arranged and used.

〔The invention's effect〕

As described above, according to the present invention, dyes that generate excitation light corresponding to laser wavelengths that oscillate with a plurality of dye containers are individually used, and pumps with short laser oscillation wavelengths are arranged in order from the output mirror to the dye containers. Since a dye solution that generates light is added and a separate optical resonator is configured for each dye container, and the reflecting mirror in the optical resonator is configured to be a reflecting mirror with window, The wavelength difference can be greatly increased, the interaction between the laser waves that are oscillating can be eliminated, and laser waves of multiple wavelengths can be stably lased, and there is no loss of light waves when transmitting through the reflecting mirror due to the window. It has the effect of being able to obtain laser light of various intensities.

Further, another invention of the present invention, the dye container arranged on the output mirror side of the reflecting mirror, so that the dye does not enter the region on the optical axis including the size of the window of the reflecting mirror, What kind of laser dye solution is put into the dye container, laser light of multiple wavelengths can be stably generated on the same central axis, and laser light of sufficient intensity can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
(A) and (B) are configuration diagrams showing pumping means for generating pumping light, FIG. 3 is a characteristic diagram showing absorption spectrum of dye capable of laser oscillation and fluorescence spectrum of laser oscillation, and FIG.
FIG. 6 is a sectional view showing another embodiment of the present invention, FIG. 5 is a sectional view showing another embodiment of the present invention, and FIG. 6 is a view showing a conventional multi-wavelength oscillation laser device. is there. In the figure, 1, 2 and 16 are dye containers, 3 are output mirrors, 4 are windowed reflecting mirrors, 5 is a first wavelength selection mechanism (first diffraction grating), 6 is a wavelength selection mechanism (second diffraction grating), and 7a. , 7b
Is a pumping light, 10 is a pumping light source, 11 is a beam splitter, 12 is a total reflection mirror, 13a and 13b are cylindrical lenses, 17 is a through hole, 20 is a concave mirror with a window, 21 is a concave lens, and 22 is a diffraction grating. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (20)

[Claims] 1. A plurality of dye containers arranged in series at intervals, a semi-transparent mirror-like output mirror arranged on one side of the dye container group for emitting laser light and used for laser oscillation, A reflecting mirror having a window in the center and arranged to be inclined between the containers, and arranged at a position that selectively reflects light of a specific wavelength of the light reflected by the reflecting mirror to the reflecting mirror side with high reflectance. And a first wavelength selecting means and the other end of the dye container group, the light having a specific wavelength of the light passing through all windows of the reflecting mirror is selectively directed to the output mirror side with high reflectance. A second wavelength selecting means for reflecting the light and a dye solution containing the dye and a solvent for the dye, the light solution being contained in the dye container and generating a light wave having a short laser oscillation wavelength by pumping in the order close to the output mirror; It was arranged at a position for irradiating each of the dye solutions with pumping light. Laser device and a Npingu means. 2. The laser device according to claim 1, wherein said pumping means irradiates said plurality of dye solutions with said pumping light at the same time. 3. The laser device according to claim 1, wherein a flash lamp is used as the pumping means. 4. The laser device according to claim 3, wherein the flash lamp is single and has a plurality of helical shapes. 5. The laser device according to claim 3, wherein a plurality of the flash lamps are synchronized with each other to output the flash lamp light. 6. The at least one wavelength selecting means and / or the second wavelength selecting means of the first wavelength selecting means is a diffraction grating. Laser device. 7. The at least one wavelength selecting means and / or the second wavelength selecting means of the first wavelength selecting means is a combination of a prism and a total reflection mirror. The laser device according to item 1. 8. The laser device according to claim 1, wherein at least one of the reflecting mirrors is a plane reflecting mirror. 9. The laser device according to claim 1, wherein at least one of the reflecting mirrors is a concave reflecting mirror. 10. The laser device according to claim 9, further comprising a concave lens arranged at a position where the light reflected by the concave reflecting mirror becomes parallel light. 11. An output mirror for emitting a laser beam and for oscillating a laser, and a reflecting mirror having a light-transmitting window in a central portion and inclined at one side of the output mirror with a space therebetween. And a translucent first dye container having a through hole which is adjacent to the reflecting mirror and near the output boundary and which is provided corresponding to the window of the reflecting mirror, and the reflecting mirror. A second dye container having a light-transmitting property, which is adjacent to each other when viewed from the side farther from the output boundary, and a light having a specific wavelength of the light reflected by the reflecting mirror are selectively reflected at high reflectance. And a first wavelength selecting means arranged at a position where the light is reflected to the reflecting mirror side, and light having a specific wavelength of light passing through a light-transmitting window of the reflecting mirror is selectively reflected with high reflectance. A second wavelength selecting unit that is disposed at a position sandwiching the second dye container with the output mirror, which is reflected to the side; A dye solution containing a dye that emits excitation light by pumping and contained in the first and second dye containers and a solvent for the dye; and a pumping means arranged at a position for irradiating each dye solution with the pumping light. Equipped laser device. 12. The laser device according to claim 11, wherein the pumping means irradiates the plurality of dye solutions with the pumping light at the same time. 13. The laser device according to claim 1 or 12, wherein a flash lamp is used as the pumping means. 14. The laser device according to claim 13, wherein the flash lamp is single and has a plurality of helical shapes. 15. The laser device according to claim 13, wherein a plurality of the flash lamps outputs the flash lamp light in synchronization with each other. 16. The at least one wavelength selecting means and / or the second wavelength selecting means of the first wavelength selecting means is a diffraction grating. Laser device. 17. At least one of the first wavelength selecting means and / or the second wavelength selecting means is a combination of a prism and a total reflection mirror. Item 11. The laser device according to item 11. 18. The laser device according to claim 11, wherein at least one of the reflecting mirrors is a plane reflecting mirror. 19. The laser device according to claim 11, wherein at least one of the reflecting mirrors is a concave reflecting mirror. 20. A concave lens disposed at a position where the light reflected by the concave reflecting mirror becomes parallel light.
20. A laser device according to claim 19, which is characterized.