JPH028161U - - Google Patents
Info
- Publication number
- JPH028161U JPH028161U JP8666988U JP8666988U JPH028161U JP H028161 U JPH028161 U JP H028161U JP 8666988 U JP8666988 U JP 8666988U JP 8666988 U JP8666988 U JP 8666988U JP H028161 U JPH028161 U JP H028161U
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- wavelength
- controlling
- modulation
- modulation means
- 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.)
- Pending
Links
- 239000004065 semiconductor Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 2
- 238000000862 absorption spectrum Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案に係る半導体レーザ波長安定化
装置の一実施例を示す構成ブロツク図、第２図は
半導体レーザ波長安定化装置の先行技術を示す構
成ブロツク図、第３図は第２図装置の動作を説明
するための説明図、第４図は第２図装置の動作を
説明するための特性曲線図、第５図は第２図装置
の動作を説明するための動作説明図、第６図は第
２図装置の動作を説明するための第２の特性曲線
図である。
ＬＤ１……半導体レーザ、ＵＭ１……変調手段
、ＣＬ１……吸収セル、ＰＤ１……第１の光検出
器、ｆｍ……変調周波数、ＬＡ１……同期整流回
路、ＣＴ２……制御手段、ＰＤ２……第２の光検
出器、Ａ３……減算手段。
FIG. 1 is a block diagram showing an embodiment of the semiconductor laser wavelength stabilization device according to the present invention, FIG. 2 is a block diagram showing the prior art of the semiconductor laser wavelength stabilization device, and FIG. 4 is a characteristic curve diagram for explaining the operation of the device in FIG. 2. FIG. 5 is an explanatory diagram for explaining the operation of the device in FIG. FIG. 6 is a second characteristic curve diagram for explaining the operation of the device shown in FIG. LD1... Semiconductor laser, UM1... Modulation means, CL1... Absorption cell, PD1... First photodetector, fm... Modulation frequency, LA1... Synchronous rectification circuit, CT2... Control means, PD2... Second photodetector, A3...subtraction means.
Claims (1)
波長を制御して波長を安定化する半導体レーザ波
長安定化装置において、半導体レーザの出力光の
一部を入射して周波数変調する変調手段と、前記
変調手段の出力光の一部を入射して特定の波長で
吸収を起こす標準物質を封入した吸収セルと、こ
の吸収セルの透過光を入射して電気信号に変換す
る第１の光検出器と、前記変調手段の出力光の他
の部分を検出して電気信号に変換する第２の光検
出器と、前記第１および第２の光検出器の出力に
関連する信号の差を演算する減算手段と、この減
算手段の出力を前記変調手段の変調周波数または
その整数倍の周波数で同期整流する同期整流回路
と、この同期整流回路の出力が一定値となるよう
に前記半導体レーザの電流または温度を制御する
制御手段とを備えたことを特徴とする半導体レー
ザ波長安定化装置。 A semiconductor laser wavelength stabilization device that stabilizes the wavelength by controlling the wavelength of a semiconductor laser to the absorption spectrum line of a standard substance, comprising a modulation means for frequency modulating a part of the output light of the semiconductor laser by inputting it, and the modulation means. an absorption cell enclosing a standard substance that causes absorption at a specific wavelength upon incidence of a portion of the output light of the first photodetector; a second photodetector for detecting another portion of the output light of the modulation means and converting it into an electrical signal; and a subtraction means for calculating a difference between signals related to the outputs of the first and second photodetectors. , a synchronous rectifier circuit that synchronously rectifies the output of the subtracting means at the modulation frequency of the modulation means or a frequency that is an integral multiple thereof; and controlling the current or temperature of the semiconductor laser so that the output of the synchronous rectifier circuit is a constant value. 1. A semiconductor laser wavelength stabilizing device comprising: a control means for controlling a wavelength of a semiconductor laser;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8666988U JPH028161U (en) | 1988-06-30 | 1988-06-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8666988U JPH028161U (en) | 1988-06-30 | 1988-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH028161U true JPH028161U (en) | 1990-01-19 |
Family
ID=31311306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8666988U Pending JPH028161U (en) | 1988-06-30 | 1988-06-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH028161U (en) |
-
1988
- 1988-06-30 JP JP8666988U patent/JPH028161U/ja active Pending
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