JPH0797695B2 - Laser equipment - Google Patents
Laser equipmentInfo
- Publication number
- JPH0797695B2 JPH0797695B2 JP63107948A JP10794888A JPH0797695B2 JP H0797695 B2 JPH0797695 B2 JP H0797695B2 JP 63107948 A JP63107948 A JP 63107948A JP 10794888 A JP10794888 A JP 10794888A JP H0797695 B2 JPH0797695 B2 JP H0797695B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- laser
- frequency
- raman
- stokes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Description
【発明の詳細な説明】 （イ）産業上の利用分野 本発明はレーザーショウ等の芸術表現や分光測定等種々
の目的に利用できるレーザー装置（レーザー光源）に関
する。The present invention relates to a laser device (laser light source) which can be used for various purposes such as artistic expression such as laser show and spectroscopic measurement.
（ロ）従来の技術 ラマン効果を起こす物質にレーザー光線（周波数ω１）
を入射せしめると、誘導ラマン効果によって物質固有の
周波数ωsrだけ変化した周波数、 ω＝ω１−ωsr の光（ストークス光）、及び周波数 ω＝ω１＋ωsr の光（反ストークス光）が発生する。このストークス光
と物質との作用によってさらに物質の振動が励起され、
周波数が ω＝ω１±ｍωsr の高次のストークス光，反ストークス光が同時発生す
る。(B) Conventional technology Laser light (frequency ω 1 ) is applied to the substance that causes the Raman effect.
When incident light is incident, light having a frequency ω = ω 1 −ωsr (Stokes light) changed by the frequency ωsr peculiar to the substance due to the stimulated Raman effect and light having a frequency ω = ω 1 + ωsr (anti-Stokes light) are generated. The action of the Stokes light and the substance further excites the vibration of the substance,
High-order Stokes light and anti-Stokes light with a frequency of ω = ω 1 ± mωsr are simultaneously generated.
このような誘導ラマン効果を利用したレーザーはラマン
レーザーと称され、よく知られているものである。スト
ークス光及び反ストークス光は単色性のよいコヒーレン
ト光で、鋭い指向性をもって放射される。A laser utilizing such a stimulated Raman effect is called a Raman laser and is well known. Stokes light and anti-Stokes light are coherent light with good monochromaticity and are emitted with a sharp directivity.
第３図はその波長特性を例示したもので、特定の波長の
所に鋭いピークを持つ光が得られる。しかしながらこれ
らの光は図でも判るように特定の波長の所に数本しか得
られないので、これを例えば波長走査を必要とする分光
器の光源として利用するには問題が多かった。FIG. 3 exemplifies the wavelength characteristic, and light having a sharp peak at a specific wavelength can be obtained. However, as can be seen from the figure, only a few of these lights can be obtained at specific wavelengths, so there were many problems in using this light as the light source of a spectroscope that requires wavelength scanning, for example.
（ハ）解決すべき課題 発明者はレーザーによる上記誘導ラマン光の実験をして
いるときに、入射レーザー光に或る種の条件を与えるこ
とにより通常の誘導ラマン光（ストークス光及び反スト
ークス光）以外に多数のスペクトル線が現れることを見
出だした。本発明はこのようなスペクトル線が発生した
原因を解明して、この現象を利用した新規なレーザー装
置を開発することを課題とする。(C) Problems to be Solved During the experiment of the stimulated Raman light by the laser, the inventor gives a certain condition to the incident laser light so that the ordinary stimulated Raman light (Stokes light and anti-Stokes light) ) Other than that, it was found that many spectral lines appeared. An object of the present invention is to elucidate the cause of generation of such a spectral line and develop a new laser device utilizing this phenomenon.
（ニ）課題を解決するための手段 本発明のレーザー装置においては、回転（振動）遷移に
伴ってラマン効果を起こす物質に周波数ω１のレーザ光
線と周波数ω２のレーザ光線とを同軸上に同時入射せし
め、 ω＝（ω１±ｍωsr）±ｎ（ω１−ω２） なる周波数ωのレーザ光線を発生させることを特徴とす
る。(D) Means for Solving the Problems In the laser device of the present invention, a laser beam having a frequency ω 1 and a laser beam having a frequency ω 2 are coaxially placed on a substance that causes a Raman effect with a rotation (vibration) transition. It is characterized in that the laser beams having a frequency ω of ω = (ω 1 ± mωsr) ± n (ω 1 −ω 2 ) are generated by simultaneous incidence.
ｍ及びｎは正の整数（ｍ＝ｎ＝１を除く）である。m and n are positive integers (excluding m = n = 1).
（ホ）作用 ラマン効果を起こす物質に周波数ω１のレーザー光線と
周波数ω２のレーザー光線とを同軸上に同時入射せしめ
ることにより、２色誘導ラマン効果と命名した作用によ
ってω１とω２の差だけ周波数が異なる多数のスペクト
ル線が発生する。(E) Action By simultaneously injecting a laser beam of frequency ω 1 and a laser beam of frequency ω 2 coaxially into a substance that causes the Raman effect, only the difference between ω 1 and ω 2 can be obtained by the action named 2-color induced Raman effect. A large number of spectral lines with different frequencies are generated.
２色誘導ラマン効果はω１の光子とω２の光子により周
波数が R1＝ω１＋（ω１−ω２） の光がまず発生し、引続きカスケード過程によって周波
数が Rn＝ω１＋ｎ（ω１−ω２） の高次の光が発生するような四光子過程により発生する
と考えられる。In the two-color stimulated Raman effect, light with a frequency of R 1 = ω 1 + (ω 1 −ω 2 ) is first generated by a photon of ω 1 and a photon of ω 2 , and then the frequency is Rn = ω 1 + n (by a cascade process. It is considered to be generated by a four-photon process in which higher-order light of ω 1 −ω 2 ) is generated.
（ヘ）実施例 第１図は本発明のレーザー装置の一実施例を示す構成図
である。本図において1,2はエキシマレーザーで励起し
たBBQ色素レーザー光源（シンチレーター系の色素BBQを
用いた色素レーザー）でその出力光の周波数は各々ω1,
ω２である。３はハーフミラー、４はラマンセルであ
る。(F) Embodiment FIG. 1 is a block diagram showing an embodiment of the laser device of the present invention. In this figure, 1 and 2 are BBQ dye laser light sources excited by excimer lasers (dye lasers using scintillator dye BBQ), whose output light frequencies are ω 1 and
It is ω 2 . 3 is a half mirror and 4 is a Raman cell.
このように構成するとセル４の出射側８には前述の２色
誘導ラマン光が得られる。ラマンセル４にはラマン媒体
として水素ガスH2を入れたが、重水素D2,窒素N2,酸素O2
等の等核２原子分子のガスやメタンCH4,重メタンDH4等
でも２色誘導ラマン効果の発生が予測される。２色誘導
ラマン光は水素ガスの場合、ガス圧２〜14kg/平方cmで
最も強かった。With this structure, the above-described two-color stimulated Raman light can be obtained on the emission side 8 of the cell 4. Hydrogen gas H 2 was introduced into the Raman cell 4 as a Raman medium, but deuterium D 2 , nitrogen N 2 , oxygen O 2
The occurrence of the two-color stimulated Raman effect is also predicted for gases such as homonuclear diatomic molecules such as methane, CH 4 and heavy methane DH 4 . In the case of hydrogen gas, the two-color stimulated Raman light was strongest at a gas pressure of 2 to 14 kg / cm 2.
本実施例の構成において、色素レーザー光源1,2からの
レーザー光線5,6は、ハーフミラー３によって１本の光
線７となりラマンセル４の中心軸上に同時に入射する。
入射した周波数ω1,ω２の光はラマン媒体の作用により
周波数が ωs1＝ω１±ｍωsr ωs2＝ω２±ｍωsr の通常のラマン光を発生するが、その他にω１とω２の
差周波数に関係する周波数 ω＝（ω１±ｍωsr）±ｎ（ω１−ω２） のレーザー光（２色誘導ラマン光）が多数（の整数ｎの
値について）出現する。In the configuration of the present embodiment, the laser beams 5 and 6 from the dye laser light sources 1 and 2 become one beam 7 by the half mirror 3 and are incident on the central axis of the Raman cell 4 at the same time.
The incident lights of frequencies ω 1 and ω 2 generate normal Raman light of frequency ωs1 = ω 1 ± mωsr ωs2 = ω 2 ± mωsr due to the action of the Raman medium, but in addition, the difference frequency between ω 1 and ω 2 A large number (about the value of integer n) of laser light (two-color stimulated Raman light) of frequency ω = (ω 1 ± mωsr) ± n (ω 1 −ω 2 ) related to
ラマンセル４からはこのような多数のスペクトル線を有
する出力光８が得られるのでこれをプリズム９で分ける
と、虹色に輝く多数のレーザー光10となる。Since the output light 8 having such a large number of spectral lines is obtained from the Raman cell 4, when this is divided by the prism 9, a large number of rainbow-colored laser lights 10 are obtained.
以上の実施例では２つのレーザー光源1,2を用いたが、
単一のレーザー光源を用い、通常の発振波長の他の比較
的単色な自然放出増幅光（Amplified Spontaneous Em
ission,以下ASEという）を生じさせこれを利用すること
もできる。ASEは色素レーザー等で自然放出光が増幅さ
れて出現したものである。Although two laser light sources 1 and 2 are used in the above embodiment,
A single laser light source is used and other relatively monochromatic spontaneous emission amplified light (Amplified Spontaneous Em
ission, hereinafter referred to as ASE) can be generated and used. ASE is a spontaneous emission of light amplified by a dye laser or the like.
第２図はASEを用いた場合に本発明により得られたレー
ザー光を分光したスペクトルの一例を示すグラフであ
る。この第２図のスペクトルと第３図に示す従来の色素
レーザーの誘導ラマンスペクトルとを比較すると、第３
図の場合、レーザーの発振スペクトル線Ｆと通常のラマ
ン光（ストークス光S1,S2,S3及び反ストークス光AS1A
S2）が観察されるだけであるが、第２図の場合、レーザ
ーの発振スペクトル線Ｆ（ω１に対応する）,ASE（ω２
に対応する）,Fのラマン光（Fundamental Stokes,ωs1
に対応する）及びASEのラマン光（ASE Stokes,ωs2に
対応する）の他にω１とω２の差周波数に関係する周波
数の多数のスペクトル線（これをRainbow Starsと命令
した）が観察できる。FIG. 2 is a graph showing an example of a spectrum of laser light obtained by the present invention when ASE is used. Comparing the spectrum of FIG. 2 with the stimulated Raman spectrum of the conventional dye laser shown in FIG.
In the case of the figure, the laser oscillation spectrum line F and normal Raman light (Stokes light S 1 , S 2 , S 3 and anti-Stokes light AS 1 A
S 2) but only is observed in the case of FIG. 2, corresponding to the oscillation spectrum line F (omega 1 of the laser), ASE (omega 2
Raman light of F (Fundamental Stokes, ωs1)
, And Raman light of ASE (corresponding to ASE Stokes, ωs2), as well as many spectral lines of frequencies related to the difference frequency between ω 1 and ω 2 (which we commanded as Rainbow Stars). .
（ト）効果 本発明によると２色誘導ラマン効果によって数多くの波
長域において夫々鋭い指向性をもつレーザー光が得られ
るので、これを分光して光源として利用することも可能
でありまた広告や照明のため虹色のイルミネーション光
としても利用できる。即ち単一のレーザー光源で彩色性
の豊かなレーザー光が得られる。(G) Effect According to the present invention, laser light having sharp directivity in a number of wavelength regions can be obtained by the two-color stimulated Raman effect. Therefore, it is possible to spectrally use the laser light and use it as a light source. Therefore, it can also be used as rainbow-colored illumination light. That is, a single laser light source can provide a laser light with rich coloring.
第１図は本発明のレーザー装置の一実施例を示す構成図
であり、第２図は本発明により得られたレーザー光のス
ペクトルの一例を示すグラフ、第３図は色素レーザーの
通常の誘導ラマンスペクトルを示すグラフである。 1,2……色素レーザー光源 ９……プリズム ３……ハーフミラー、４……ラマンセルFIG. 1 is a block diagram showing an embodiment of a laser device of the present invention, FIG. 2 is a graph showing an example of a spectrum of laser light obtained by the present invention, and FIG. 3 is a normal induction of a dye laser. It is a graph which shows a Raman spectrum. 1,2 …… Dye laser light source 9 …… Prism 3 …… Half mirror 4 …… Raman cell
Claims (1)
こす物質に周波数ω１のレーザ光線と周波数ω２のレー
ザ光線とを同軸上に同時入射せしめ、 ω＝（ω１±ｍωsr）±ｎ（ω１−ω２） なる周波数ωのレーザ光線を発生させることを特徴とす
るレーザー装置。 但し、ｍ及びｎは正の整数（ｍ＝ｎ＝１を除く）であ
り、ωsrは物質固有の周波数である。 1. A laser beam having a frequency ω 1 and a laser beam having a frequency ω 2 are simultaneously and coaxially incident on a substance which causes a Raman effect with a rotation (vibration) transition, and ω = (ω 1 ± mωsr) ± A laser device for generating a laser beam having a frequency ω of n (ω 1 −ω 2 ). However, m and n are positive integers (excluding m = n = 1), and ωsr is a frequency peculiar to the substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63107948A JPH0797695B2 (en) | 1988-04-30 | 1988-04-30 | Laser equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63107948A JPH0797695B2 (en) | 1988-04-30 | 1988-04-30 | Laser equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01278790A JPH01278790A (en) | 1989-11-09 |
| JPH0797695B2 true JPH0797695B2 (en) | 1995-10-18 |
Family
ID=14472111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63107948A Expired - Fee Related JPH0797695B2 (en) | 1988-04-30 | 1988-04-30 | Laser equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0797695B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4696297B2 (en) * | 2005-03-09 | 2011-06-08 | 独立行政法人産業技術総合研究所 | Ultrashort pulse laser generation method and apparatus |
| JP5035965B2 (en) * | 2007-03-26 | 2012-09-26 | 学校法人中部大学 | Multi-wavelength far-infrared laser oscillation method and multi-wavelength far-infrared laser oscillation device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816754A (en) * | 1973-03-21 | 1974-06-11 | Ibm | Tunable infrared/ultraviolet laser |
-
1988
- 1988-04-30 JP JP63107948A patent/JPH0797695B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01278790A (en) | 1989-11-09 |
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