JPH0237713B2 - NETSUHENCHONYORUNAIBUKAGAMIREEZANOSHUHASUANTEIKAHOHO - Google Patents
NETSUHENCHONYORUNAIBUKAGAMIREEZANOSHUHASUANTEIKAHOHOInfo
- Publication number
- JPH0237713B2 JPH0237713B2 JP11476584A JP11476584A JPH0237713B2 JP H0237713 B2 JPH0237713 B2 JP H0237713B2 JP 11476584 A JP11476584 A JP 11476584A JP 11476584 A JP11476584 A JP 11476584A JP H0237713 B2 JPH0237713 B2 JP H0237713B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- laser
- internal mirror
- laser tube
- thin film
- 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 - Lifetime
Links
- 239000010409 thin film Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 2
- 235000019687 Lamb Nutrition 0.000 description 1
- 230000035559 beat frequency Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
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】
本発明は、熱変調による内部鏡レーザの周波数
安定化方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for frequency stabilization of an internal mirror laser by thermal modulation.
気体レーザは外部鏡型と内部鏡型に大別され、
そのいずれについても周波数安定化が行われ、計
測用光源として用いられている。このうち内部鏡
型レーザは音響などの外部雑音に対して強いとい
う特徴があり、より実用的な光源として利用され
ることが多い。レーザ光の周波数νはレーザ鏡の
間隔Ｌに依存することから周波数安定化はレーザ
鏡間隔Ｌを制御することで行う。しかし内部鏡レ
ーザではレーザ管とレーザ鏡が一体となつている
ため、レーザ鏡を高速で動作させることは困難で
あり、変調方式による周波数安定化はほとんど行
われていない。無変調方式による安定化方法とし
ては、異なつた偏光成分間の強度差、あるいはビ
ート周波数を利用したものなどがあるが、いずれ
も特定の周波数を参照できないことから周波数絶
対値の再現性という点で問題がある。 Gas lasers are broadly divided into external mirror type and internal mirror type.
All of them have been frequency stabilized and are used as measurement light sources. Among these, internal mirror lasers have the characteristic of being resistant to external noise such as acoustics, and are often used as a more practical light source. Since the frequency ν of the laser beam depends on the distance L between the laser mirrors, the frequency is stabilized by controlling the distance L between the laser mirrors. However, in internal mirror lasers, since the laser tube and laser mirror are integrated, it is difficult to operate the laser mirror at high speed, and frequency stabilization using a modulation method is rarely performed. Stabilization methods using non-modulation methods include those that utilize the intensity difference between different polarized light components or the beat frequency, but these methods have problems in terms of reproducibility of the absolute frequency value because they cannot refer to a specific frequency. There's a problem.
本発明では薄膜状のヒーターをレーザ管の表面
にコーテイングすることにより、内部鏡レーザの
レーザ管長、すなわちレーザ鏡間隔Ｌを熱的に高
速動作させることを可能にした。これによりレー
ザ周波数νを高速変調することができ、出力強
度・周波数の特性曲線にしたがつて出力強度の変
調信号をおよそ1KHz程度の変調周波数領域まで
安定に検出することができる。この信号をレーザ
管長の制御に用いることで、レーザ光周波数ν
を、出力強度・周波数特性曲線の極値、すなわち
出力強度の最大値や、ラムデイツプと呼ばれる極
小値へ固定することができる。これにより安価で
実用性があり、波長絶対値の再現性に優れたレー
ザ製作が可能となつた。 In the present invention, by coating the surface of the laser tube with a thin film heater, it is possible to thermally operate the laser tube length of the internal mirror laser, that is, the laser mirror interval L, at high speed. As a result, the laser frequency ν can be modulated at high speed, and the output intensity modulation signal can be stably detected up to a modulation frequency range of about 1 KHz according to the output intensity/frequency characteristic curve. By using this signal to control the laser tube length, the laser light frequency ν
can be fixed to the extreme value of the output intensity/frequency characteristic curve, that is, the maximum value of the output intensity, or the minimum value called the lamb dip. This has made it possible to manufacture a laser that is inexpensive, practical, and has excellent reproducibility of the absolute wavelength value.
装置の構成を図に示す。薄膜状のヒーター２を
コーテイングした内部鏡レーザ管１、偏光板３、
光検出器４、発振器５、同期検出器６、制御信号
処理器７、ヒーター供給電力制御器８により構成
される。 The configuration of the device is shown in the figure. An internal mirror laser tube 1 coated with a thin film heater 2, a polarizing plate 3,
It is composed of a photodetector 4, an oscillator 5, a synchronous detector 6, a control signal processor 7, and a heater supply power controller 8.
まず発振器５によつて与えられた周波数ｆで変
調された電力を、電力制御器８から薄膜状ヒータ
ー２へ加える。これによりレーザ管１の長さが変
調をうけ、出力強度・周波数特性曲線にしたがつ
て強度変調された光ビームがレーザ管１より出力
される。薄膜ヒーター２とレーザ管１の間の熱伝
達特性が良好であることから周波数ｆが1KHz程
度の領域まで、充分に検出可能な強度変調を与え
ることができる。出力光の一部、あるいは図に示
すようにレーザ管１の背面から得られる弱い出力
光を偏光板３を透過させる。偏光板３の透過容易
な偏光面をレーザ光の１つの縦モードの偏光方向
に一致させると、レーザ管１が縦モード数１ある
いは２でのみ出力するものであれば、偏光板３を
透過する光は単一モードのみとなり、より良好な
変調信号が得られる。この光を光検出器４で電気
信号に変換し、同期検出器６に入力する。同期検
出器６では発振器５によつて与えられた周波数ｆ
の成分のみを位相同期検出し制御信号処理器７に
入力する。制御信号処理器７では、同期検出信号
を適当に増倍すると共に制御に適した時定数を与
える。制御信号処理器７の出力は制御信号として
電力制御器８へ入力される。電力制御器８では制
御信号に発振器５からの周波数ｆの変調信号を加
え合わせ、それに応じた電力を薄膜ヒーター２へ
供給する。以上により、同期検出信号による制御
が達成される。この同期検出信号は、出力強度−
周波数特性曲線の１次微分値と見なせることか
ら、特性曲線が極値となるような位置へレーザ管
長が制御される。 First, power modulated at a frequency f given by the oscillator 5 is applied from the power controller 8 to the thin film heater 2 . As a result, the length of the laser tube 1 is modulated, and a light beam whose intensity is modulated according to the output intensity/frequency characteristic curve is outputted from the laser tube 1. Since the heat transfer characteristics between the thin film heater 2 and the laser tube 1 are good, it is possible to provide sufficiently detectable intensity modulation up to a frequency f of about 1 KHz. A part of the output light, or a weak output light obtained from the back side of the laser tube 1 as shown in the figure, is transmitted through the polarizing plate 3. If the polarization plane of the polarizing plate 3 that is easily transmitted matches the polarization direction of one longitudinal mode of the laser beam, the laser beam will be transmitted through the polarizing plate 3 if the laser tube 1 outputs only one or two longitudinal modes. The light becomes only in a single mode, and a better modulated signal can be obtained. This light is converted into an electrical signal by a photodetector 4 and input to a synchronous detector 6. In the synchronization detector 6, the frequency f given by the oscillator 5
Only the components of the signal are phase synchronized and input to the control signal processor 7. The control signal processor 7 appropriately multiplies the synchronization detection signal and provides a time constant suitable for control. The output of the control signal processor 7 is input to the power controller 8 as a control signal. The power controller 8 adds the modulation signal of frequency f from the oscillator 5 to the control signal, and supplies the thin film heater 2 with power corresponding to the modulation signal. As described above, control using the synchronization detection signal is achieved. This synchronization detection signal has an output strength of -
Since it can be regarded as a first-order differential value of the frequency characteristic curve, the laser tube length is controlled to a position where the characteristic curve becomes an extreme value.
第１図は本発明を実施する装置の構成図であ
る。
１……内部鏡レーザ管、２……薄膜ヒーター、
３……偏光板、４……光検出器、５……発振器、
６……同期検出器、７……制御信号処理器、８…
…ヒーター供給電力制御器。
FIG. 1 is a block diagram of an apparatus for implementing the present invention. 1... Internal mirror laser tube, 2... Thin film heater,
3... Polarizing plate, 4... Photodetector, 5... Oscillator,
6...Synchronization detector, 7...Control signal processor, 8...
...heater supply power controller.
Claims (1)
ーザ管における上記ヒーターに、変調をかけた電
力を供給することにより、レーザ管長を熱的に変
調し、出力強度・周波数特性曲線の極大値あるい
は極小値に周波数を安定化することを特徴とする
熱変調による内部鏡レーザの周波数安定化方法。1 By supplying modulated power to the heater in the internal mirror laser tube coated with a thin film heater, the laser tube length is thermally modulated, and the frequency is adjusted to the maximum or minimum value of the output intensity/frequency characteristic curve. A method for frequency stabilization of an internal mirror laser by thermal modulation, characterized by stabilizing the frequency of an internal mirror laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11476584A JPH0237713B2 (en) | 1984-06-05 | 1984-06-05 | NETSUHENCHONYORUNAIBUKAGAMIREEZANOSHUHASUANTEIKAHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11476584A JPH0237713B2 (en) | 1984-06-05 | 1984-06-05 | NETSUHENCHONYORUNAIBUKAGAMIREEZANOSHUHASUANTEIKAHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60258985A JPS60258985A (en) | 1985-12-20 |
| JPH0237713B2 true JPH0237713B2 (en) | 1990-08-27 |
Family
ID=14646120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11476584A Expired - Lifetime JPH0237713B2 (en) | 1984-06-05 | 1984-06-05 | NETSUHENCHONYORUNAIBUKAGAMIREEZANOSHUHASUANTEIKAHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0237713B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0193190A (en) * | 1987-10-05 | 1989-04-12 | Shiyuuko Suzuki | Two-frequency stabilized laser with high frequency optical beat |
| JPH07109918B2 (en) * | 1989-02-20 | 1995-11-22 | 日本科学エンジニアリング株式会社 | Gas laser frequency stabilization method |
-
1984
- 1984-06-05 JP JP11476584A patent/JPH0237713B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60258985A (en) | 1985-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |