JPS57136382A - Output stabilising method of semiconductor laser - Google Patents

Output stabilising method of semiconductor laser

Info

Publication number
JPS57136382A
JPS57136382A JP56020893A JP2089381A JPS57136382A JP S57136382 A JPS57136382 A JP S57136382A JP 56020893 A JP56020893 A JP 56020893A JP 2089381 A JP2089381 A JP 2089381A JP S57136382 A JPS57136382 A JP S57136382A
Authority
JP
Japan
Prior art keywords
output
semiconductor laser
amplifier
null
circuit
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
JP56020893A
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 JP56020893A priority Critical patent/JPS57136382A/en
Publication of JPS57136382A publication Critical patent/JPS57136382A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To stabilize an output from a semiconductor laser by a method wherein when an output of a semiconductor laser is null, by comparison between a small signal due to secular or thermal change in photo-detectors and amplifiers and a reference voltage of an amplifier, adjustment is made so that an output of the amplifier may be null. CONSTITUTION:By a driving circuit having an input which is an output of a modulation circuit 1a, a semiconductor laser 1 is operated. The laser beam output of the semiconductor laser 1 is detected by a photo-detector, and amplification in an amplifier 10 is done. The maximum output of the amplifier 10 is held in a peak hold circuit and its output is compared with a reference voltage V1 in a comparing circuit. In this process an offset voltage due to variation in a temperature or the like of the photo-detector and the amplifier is applied on the second comparator 11, and through comparing with a reference voltage V2 which is set when the offset voltage is null, a difference signal between them is applied on a gate circuit 15, and the offset voltage is controlled to be null. By this method an output of a semiconductor laser is stabilized.
JP56020893A 1981-02-17 1981-02-17 Output stabilising method of semiconductor laser Pending JPS57136382A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56020893A JPS57136382A (en) 1981-02-17 1981-02-17 Output stabilising method of semiconductor laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56020893A JPS57136382A (en) 1981-02-17 1981-02-17 Output stabilising method of semiconductor laser

Publications (1)

Publication Number Publication Date
JPS57136382A true JPS57136382A (en) 1982-08-23

Family

ID=12039896

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56020893A Pending JPS57136382A (en) 1981-02-17 1981-02-17 Output stabilising method of semiconductor laser

Country Status (1)

Country Link
JP (1) JPS57136382A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4713672A (en) * 1985-07-24 1987-12-15 Mita Industrial Co., Ltd. Laser beam printer
JPS6354793A (en) * 1986-08-25 1988-03-09 Sony Corp Semiconductor laser
JPS63217764A (en) * 1987-03-05 1988-09-09 Fuji Photo Film Co Ltd Laser recorder
WO2013116118A3 (en) * 2012-02-02 2013-10-31 Coherent, Inc. Output-power control apparatus for a co2 gas-discharge laser

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4713672A (en) * 1985-07-24 1987-12-15 Mita Industrial Co., Ltd. Laser beam printer
JPS6354793A (en) * 1986-08-25 1988-03-09 Sony Corp Semiconductor laser
JPS63217764A (en) * 1987-03-05 1988-09-09 Fuji Photo Film Co Ltd Laser recorder
WO2013116118A3 (en) * 2012-02-02 2013-10-31 Coherent, Inc. Output-power control apparatus for a co2 gas-discharge laser
US8731014B2 (en) 2012-02-02 2014-05-20 Coherent, Inc. Output-power control apparatus for a CO2 gas-discharge laser

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