JPS5690583A - Stabilizing device of output for semiconductor laser - Google Patents

Stabilizing device of output for semiconductor laser

Info

Publication number
JPS5690583A
JPS5690583A JP16670979A JP16670979A JPS5690583A JP S5690583 A JPS5690583 A JP S5690583A JP 16670979 A JP16670979 A JP 16670979A JP 16670979 A JP16670979 A JP 16670979A JP S5690583 A JPS5690583 A JP S5690583A
Authority
JP
Japan
Prior art keywords
output
laser
current
resistor
signals
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
JP16670979A
Other languages
Japanese (ja)
Inventor
Isamu Shibata
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP16670979A priority Critical patent/JPS5690583A/en
Publication of JPS5690583A publication Critical patent/JPS5690583A/en
Pending legal-status Critical Current

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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H01S5/06837—Stabilising otherwise than by an applied electric field or current, e.g. by controlling the temperature

Abstract

PURPOSE:To stabilize an output of semiconductor laser by a method wherein a life of laser element is not reduced and a fast reaction is made for a rapid variation of the output. CONSTITUTION:When a temperature of the laser 2 is kept constant and its output is Po, the laser beam is received at 3, the signal is amplified and a polarity of the laser is reversed at 11, and added at 12 with a reference signal 13. Thus, the output of addition 12 is in a reverse relation with the laser output and compared at 14 with a signal proportional to a laser driving current I from the resistor R. The current I is controlled so as to cause both signals to be equal with each other. In turn, Peltier element 16 is operated at 15 by the signals at both ends of the resistor R and the laser element 2 is forcedly cooled. This cooling operation is performed in reference to only a laser driving circuit I. As a result, when the output is varied, the laser driving current is increased or decreased to control the output and at the same time a temprature of the laser element is controlled in response to a degree of current, so that the output may quickly be stabilized and a deterioration of the laser element may be prevented.
JP16670979A 1979-12-21 1979-12-21 Stabilizing device of output for semiconductor laser Pending JPS5690583A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16670979A JPS5690583A (en) 1979-12-21 1979-12-21 Stabilizing device of output for semiconductor laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16670979A JPS5690583A (en) 1979-12-21 1979-12-21 Stabilizing device of output for semiconductor laser

Publications (1)

Publication Number Publication Date
JPS5690583A true JPS5690583A (en) 1981-07-22

Family

ID=15836299

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16670979A Pending JPS5690583A (en) 1979-12-21 1979-12-21 Stabilizing device of output for semiconductor laser

Country Status (1)

Country Link
JP (1) JPS5690583A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5896794A (en) * 1981-12-04 1983-06-08 Konishiroku Photo Ind Co Ltd Method of photo output stabilization for laser diode and device thereof
JPH04144248A (en) * 1990-10-05 1992-05-18 Nec Corp Testing method of semiconductor integrated circuit
EP0618653A2 (en) * 1993-03-30 1994-10-05 Nec Corporation Frequency stabilization method of semiconductor laser, frequency-stabilized light source and laser module

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5896794A (en) * 1981-12-04 1983-06-08 Konishiroku Photo Ind Co Ltd Method of photo output stabilization for laser diode and device thereof
JPH021383B2 (en) * 1981-12-04 1990-01-11 Konishiroku Photo Ind
JPH04144248A (en) * 1990-10-05 1992-05-18 Nec Corp Testing method of semiconductor integrated circuit
EP0618653A2 (en) * 1993-03-30 1994-10-05 Nec Corporation Frequency stabilization method of semiconductor laser, frequency-stabilized light source and laser module
EP0618653A3 (en) * 1993-03-30 1995-04-12 Nippon Electric Co Frequency stabilization method of semiconductor laser, frequency-stabilized light source and laser module.

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