JPS60130875A - Automatic output control device of laser diode - Google Patents

Automatic output control device of laser diode

Info

Publication number
JPS60130875A
JPS60130875A JP23934383A JP23934383A JPS60130875A JP S60130875 A JPS60130875 A JP S60130875A JP 23934383 A JP23934383 A JP 23934383A JP 23934383 A JP23934383 A JP 23934383A JP S60130875 A JPS60130875 A JP S60130875A
Authority
JP
Japan
Prior art keywords
laser diode
temperature
current
drive
drive current
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
Application number
JP23934383A
Other languages
Japanese (ja)
Inventor
Takao Miyazawa
孝雄 宮澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP23934383A priority Critical patent/JPS60130875A/en
Publication of JPS60130875A publication Critical patent/JPS60130875A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S5/00Semiconductor lasers
    • H01S5/06Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068Stabilisation of laser output parameters
    • H01S5/06825Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S5/00Semiconductor lasers
    • H01S5/06Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068Stabilisation of laser output parameters
    • H01S5/06804Stabilisation of laser output parameters by monitoring an external parameter, e.g. temperature

Abstract

PURPOSE:To enable the automatic output control not only at constant-current drive, but also at even at high-frequency pulse drive by controlling the driving current by temperature detection so as to obtain a constant light output constantly. CONSTITUTION:A temperature of a laser diode 24 is detected by a temperature detector 23 and the detected temperature signal is read by a microcomputer 26. If the temperature is over the upper limit or is under the lower limit, a reset switch 27 operates to stop the current flowing to a laser diode 24 instantly. Also, the temperature signal from the temperature detector 23 is between the upper and lower limits, a current control signal corresponding to that temperature is outputted and a drive current generator 29 supplys a drive current to the laser diode 24. When a switch 21 is turned on, the microcomputer 26 starts the operation to take in the temperature signal. Next, when a switch 22 is turned on, the current control signal is outputted to cause the drive current generator 29 to flow the drive current to the laser diode 24.

Description

【発明の詳細な説明】 〔J支金釘分野 〕 本元明はレーザダイオードの自動出力制御装置に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of J-Skin Nail] The present invention relates to an automatic output control device for a laser diode.

〔従来技術〕[Prior art]

従来のレーザダイオードの自動出力制御装置はレーザダ
イオードに内藏されているモニタ用フォトダイオードに
より光出力を検出し、その検出信号によりレーザダイオ
ードの駆動電流を制御し、レーザダイオードの光出力が
一定に保たれるようにするものであった。しかしこの方
法ではレーザダイオードを高周波パルス駆動する場合に
は、前記モニタ用フォトダイオードでは時間応答性が悪
く、正しく光出力を検出することは困難であるという問
題点があった。
Conventional automatic output control devices for laser diodes detect the optical output using a monitoring photodiode built into the laser diode, and use the detection signal to control the laser diode drive current to maintain a constant optical output of the laser diode. It was meant to be preserved. However, this method has a problem in that when the laser diode is driven by high-frequency pulses, the monitoring photodiode has poor time response, making it difficult to accurately detect the optical output.

〔目 的〕〔the purpose〕

本発明はかかる問題点を解決するもので、その目的とす
るところは、レーザダイオードを高周波パルス駆動する
場合でも、安定した自動出力制宿1により、レーザダイ
オードの光出力を一定に保つことができるようにした、
レーザダイオードの自動出力制御装置を提供することで
ある。
The present invention is intended to solve such problems, and its purpose is to be able to keep the optical output of the laser diode constant by stable automatic output control 1 even when driving the laser diode with high frequency pulses. I did it like this,
An object of the present invention is to provide an automatic output control device for a laser diode.

〔概 要〕〔overview〕

本発明のレーザダイオードの自動出力制御装置は、第1
図に示すようにレーザダイオードの温度を検出する温度
検出器12による信号を入力としてI!p、41カ′屯
流の制御信号を発生する駆動電流制御手段13と、′前
記制御信号によりレーザダイオードを駆動させる駆動電
流発生器14からなることを特徴とする。
The automatic output control device for a laser diode of the present invention has a first
As shown in the figure, inputting the signal from the temperature detector 12 that detects the temperature of the laser diode, I! The present invention is characterized in that it comprises a drive current control means 13 which generates a control signal of 41 currents, and a drive current generator 14 which drives a laser diode using the control signal.

〔実施例〕〔Example〕

以下本発明のレーザダイオードの自動出力制御装置の一
実1/m tPIJを示すと、第2図のようにマイクロ
コンピュータ26および周辺回路からできている。ここ
に示したマイクロコンピュータはCPU、RAM 、R
OMおよび入出力ボート等から’il′Lj成されてい
る2uえばワンチップマイクロコンピュータである。l
AaMt検出器23はレーザダイオード。
Hereinafter, an example of an automatic output control device for a laser diode according to the present invention, 1/m tPIJ, is shown. As shown in FIG. 2, it is made up of a microcomputer 26 and peripheral circuits. The microcomputer shown here has CPU, RAM, R
The 2U is a one-chip microcomputer consisting of an OM, an input/output board, etc. l
AaMt detector 23 is a laser diode.

24の温度検出をするもので、25のA / D変換器
を介してマイクロコンピュータ26の入力ボートに接続
されている。これにより温度検出器26からの温度信号
が2進符号に変換されてマイクロコンピュータ26に読
み込まれる。またマイクロコンピュータ26には上限温
度と下限温度、およびbeに対応した電流制御信号値が
設定されている。し1jえは上限温度を50℃、下限温
度を0℃に設定しておけば、渦層検出器23からの温度
信号と比較して50℃以上の場合および、0℃以下の場
合には、リセットスイッチ27を動作させレーザダイオ
ード24への通電は直ちに中止される。
It detects 24 temperatures and is connected to the input port of the microcomputer 26 via 25 A/D converters. As a result, the temperature signal from the temperature detector 26 is converted into a binary code and read into the microcomputer 26. Further, the microcomputer 26 is set with an upper limit temperature, a lower limit temperature, and a current control signal value corresponding to be. If you set the upper limit temperature to 50°C and the lower limit temperature to 0°C, if the temperature signal from the vortex layer detector 23 is higher than 50°C and lower than 0°C, The reset switch 27 is operated and the power supply to the laser diode 24 is immediately stopped.

また温度検出器からの温度信号が0℃から50℃の場合
には、その温度に対応した2進符号の1を流制御信号を
28のD / A変換器に出力する。2BのD/A変換
器は前記電流制御信号をA / D変換し、アナ774
3号を29の駆動電流発生器に出力する。29の駆動電
流発生器は前記7′ナログ信号により、24のレーザダ
イオードに駆動電流を供給する。スイッチ21をオンす
るとマイクロコンピュータ26が動作し始め、A/D変
挨器からの温[f、’3号を入力ボートに取り入れる。
Further, when the temperature signal from the temperature detector is between 0°C and 50°C, a binary code of 1 corresponding to the temperature is outputted as a flow control signal to the 28 D/A converters. The 2B D/A converter A/D converts the current control signal and converts the current control signal into an analog 774
No. 3 is output to the drive current generator 29. A drive current generator 29 supplies a drive current to a laser diode 24 according to the 7' analog signal. When the switch 21 is turned on, the microcomputer 26 starts operating and takes in the temperature [f, No. 3 from the A/D transformer to the input boat.

次にスイッチ22をオンすると、D/A変換器に電流f
li制御信号を出力し、駆動電流発生器29によりレー
ザダイオード29に駆A11Il電流が流れる。以上あ
げた温度数値は単なる一列に過ぎない。
Next, when the switch 22 is turned on, a current f is applied to the D/A converter.
The li control signal is output, and the drive current generator 29 causes a drive A11I1 current to flow through the laser diode 29. The temperature values listed above are just a series.

次に上記のように構成したレーザダイオードの自動出力
制御装置の動作を、第3図のフローチャートを用いて説
明する。
Next, the operation of the automatic output control device for a laser diode constructed as described above will be explained using the flowchart shown in FIG.

スタートスイッチ21を押すと、マイクロコンピュータ
26中のRoM&:、、H己1怠された第3図のフロー
チャートに示す制御プログラムの手順に従って動作を始
める(ステップ31)。最初に偏置検出器Gこよりレー
ザダイオードの温度検出を行なう(ステップ32)。こ
の検出温度とマイクロコンピュータのRAMまたはRO
Mに設定されている第一の設定温[T1と比較して(ス
テップ63)、No(TIより低いンの場合はリセット
スイッチをオン(ステップ38)する。YFiS(T1
より1−Lい)の場合は、第2の設定偏屈T2と比較す
る(ステップ54〕。No (T2より高い)の場合は
、リセットスイッチをオン(ステップ58)する。YE
S(T2より低いンの場合には、スイッチ22がオンし
ているかどうか確かめる。(ステップ!15.56)。
When the start switch 21 is pressed, the operation starts according to the procedure of the control program shown in the flowchart of FIG. 3, which is stored in the microcomputer 26 (step 31). First, the temperature of the laser diode is detected by the eccentric detector G (step 32). This detected temperature and the microcomputer's RAM or RO
Compare with the first set temperature [T1 set in M (step 63), and if it is lower than No (TI), turn on the reset switch (step 38). YFiS (T1
If the deviation is 1-L lower), compare it with the second set deflection T2 (step 54). If No (higher than T2), turn on the reset switch (step 58). YE
If S (lower than T2), check whether switch 22 is on (Step! 15.56).

NO(オフ状態)の’Jh 合にはτ晶就検出にもどり
、YBS(オン状態)の場合には、検出温度に対応した
電流制御信号を計算して(ステップ!+6)、D/A変
換器に出力する(ステップ57)。
If 'Jh' is NO (off state), the process returns to τ crystallization detection, and if YBS (on state), a current control signal corresponding to the detected temperature is calculated (step!+6) and D/A conversion is performed. output to the device (step 57).

このようにスタートスイッチ21がオンしている限り、
第3図のフローチャートに示した手順に従って、レーザ
ダイオードの駆動電流を調整して、光出力の自動出力制
御を行なう。
As long as the start switch 21 is turned on in this way,
According to the procedure shown in the flowchart of FIG. 3, the driving current of the laser diode is adjusted to perform automatic output control of the optical output.

〔効 果〕〔effect〕

本発明のレーザダイオードの自動出力制御装置は、温度
検出により駆動電流を制御し、常に一定の光出力が得ら
れるようにしたため、定1「流駆動の場合だけでなく、
内蔵のモニタ用フォトダイオードの応答性の限界を超え
た高周波パルスFJA動時にも自動出力制御が行なえる
という利点を有゛する。また、光出力のモニタ用のフォ
トダイオードが内蔵されていないレーザダイオードにお
いてでも自動出力制御を行なうことが可能である。さら
に1リセツトスイツチをオンする制御手段により、レー
ザダイオードの使用温度範囲外ではレーザダイオードに
は駆111Jl電流は流れないので、レーザダイオード
の破壊防止にも役立つ。
The automatic output control device for a laser diode of the present invention controls the drive current by temperature detection so that a constant light output is always obtained.
It has the advantage that automatic output control can be performed even during high frequency pulse FJA operation that exceeds the response limit of the built-in monitoring photodiode. Further, automatic output control can be performed even in a laser diode that does not have a built-in photodiode for monitoring optical output. Furthermore, the control means for turning on the 1 reset switch prevents the 111 Jl current from flowing through the laser diode outside the operating temperature range of the laser diode, which also helps prevent damage to the laser diode.

【図面の簡単な説明】[Brief explanation of drawings]

8+51図は本発明の(イ・“I成を明示する図、第2
図は本発明の実Lm Vt1Jとしてのレーザダイオー
ドの自動出力fli!I御装匝の電気回路図、第6図は
出力制御を行なうためのプログラムの一例を示スフロー
チャート。 23・・・・・・温庇検出器 24・・・・・・レーザダイオード 25・・・・・・A/D変換器 26・・・・・・マイクロコンピュータ28・・・・・
・D / A変換器 29・・・・・・駆動′屯流発生器 以上 出願人 株式会社諏訪精工舎 代理人 弁理士 最上 務 第3図
Figure 8+51 is a diagram showing the (I) configuration of the present invention, the second
The figure shows the automatic output fli of the laser diode as the actual Lm Vt1J of the present invention! FIG. 6 is a flowchart showing an example of a program for controlling output. 23... Warm eave detector 24... Laser diode 25... A/D converter 26... Microcomputer 28...
・D/A converter 29...Drive 'torrent flow generator' Applicant: Suwa Seikosha Co., Ltd. Representative Patent attorney: Tsutomu Mogami Figure 3

Claims (1)

【特許請求の範囲】[Claims] レーザダイオードの温度を検出する温度検出器と、前記
偏置検出器が検出した温度を入力信号として、レーザダ
イオードの駆動電流の制御信号を発生する駆動電流制御
手段と、前記制御信号によリレーザダイオードを駆動さ
せるib動電流発生器からなることを特徴とする、レー
ザダイオードの自動出力制御装置。
a temperature detector that detects the temperature of the laser diode; a drive current control means that uses the temperature detected by the eccentric detector as an input signal to generate a control signal for the drive current of the laser diode; An automatic output control device for a laser diode, comprising an ib dynamic current generator that drives a diode.
JP23934383A 1983-12-19 1983-12-19 Automatic output control device of laser diode Pending JPS60130875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23934383A JPS60130875A (en) 1983-12-19 1983-12-19 Automatic output control device of laser diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23934383A JPS60130875A (en) 1983-12-19 1983-12-19 Automatic output control device of laser diode

Publications (1)

Publication Number Publication Date
JPS60130875A true JPS60130875A (en) 1985-07-12

Family

ID=17043323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23934383A Pending JPS60130875A (en) 1983-12-19 1983-12-19 Automatic output control device of laser diode

Country Status (1)

Country Link
JP (1) JPS60130875A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0220084A (en) * 1988-07-08 1990-01-23 Nec Corp Circuit for stabilizing oscillating wavelength of laser diode

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763879A (en) * 1980-10-06 1982-04-17 Ricoh Co Ltd Output stabilizing method for semiconductor laser device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763879A (en) * 1980-10-06 1982-04-17 Ricoh Co Ltd Output stabilizing method for semiconductor laser device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0220084A (en) * 1988-07-08 1990-01-23 Nec Corp Circuit for stabilizing oscillating wavelength of laser diode

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