GB2007015A - Control apparatus - Google Patents

Control apparatus

Info

Publication number
GB2007015A
GB2007015A GB7840816A GB7840816A GB2007015A GB 2007015 A GB2007015 A GB 2007015A GB 7840816 A GB7840816 A GB 7840816A GB 7840816 A GB7840816 A GB 7840816A GB 2007015 A GB2007015 A GB 2007015A
Authority
GB
United Kingdom
Prior art keywords
laser
emission
amplifier
wavelength
photodiode
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.)
Granted
Application number
GB7840816A
Other versions
GB2007015B (en
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB7840816A priority Critical patent/GB2007015B/en
Publication of GB2007015A publication Critical patent/GB2007015A/en
Application granted granted Critical
Publication of GB2007015B publication Critical patent/GB2007015B/en
Expired 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
    • 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
    • H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
    • 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
    • H01S5/0687—Stabilising the frequency of the laser
    • 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
    • H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
    • H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Semiconductor Lasers (AREA)

Abstract

This invention relates to stabilising the emission intensity and wavelength of a semi-conductor laser 1. The laser driver 5 is connected in a feedback loop comprising a beam-splitter 6, a photodiode 8 and an amplifier 19, which loop controls the driver 5 to maintain the intensity of the laser emission constant. The emission is also sampled by a beam-splitter 7 and a photodiode 9, which is made frequency- dependent by a filter 10 interposed in the path of the beam. The outputs of the matched photodiodes 8 and 9 are fed via amplifiers 11 and 13 to the positive and negative inputs of a subtractor amplifier 12, the output of which is therefore dependent only upon the emission wavelength. This output is fed as negative feedback to an amplifier 15 for controlling at 14 an operating parameter (such as the temperature) of the laser 1 to maintain the wavelength constant. <IMAGE>
GB7840816A 1977-10-26 1978-10-17 Control apparatus Expired GB2007015B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7840816A GB2007015B (en) 1977-10-26 1978-10-17 Control apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4457277 1977-10-26
GB7840816A GB2007015B (en) 1977-10-26 1978-10-17 Control apparatus

Publications (2)

Publication Number Publication Date
GB2007015A true GB2007015A (en) 1979-05-10
GB2007015B GB2007015B (en) 1982-03-17

Family

ID=26265420

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7840816A Expired GB2007015B (en) 1977-10-26 1978-10-17 Control apparatus

Country Status (1)

Country Link
GB (1) GB2007015B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122022A (en) * 1979-05-08 1984-01-04 Canon Kk A semiconductor laser device and an image recording apparatus using the same
GB2154787A (en) * 1984-01-17 1985-09-11 Standard Telephones Cables Ltd Laser stabilisation circuit
GB2181885A (en) * 1983-05-06 1987-04-29 Coherent Inc Power output control of laser
DE3715101A1 (en) * 1986-05-13 1987-11-19 Litton Systems Inc CONTROL OF INTENSITY AND WAVELENGTH OF A LASER DIODE
US4842358A (en) * 1987-02-20 1989-06-27 Litton Systems, Inc. Apparatus and method for optical signal source stabilization
EP0604931A3 (en) * 1992-12-28 1995-01-25 Matsushita Electric Industrial Co Ltd Medical laser and apparatus for diagnosis and therapy using this laser.
US6214033B1 (en) 1992-12-28 2001-04-10 Matsushita Electric Industrial Co., Ltd. Medical laser apparatus and diagnostic/treatment apparatus using the medical laser apparatus
GB2360628A (en) * 2000-03-25 2001-09-26 Marconi Comm Ltd A stabilised radiation source

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122022A (en) * 1979-05-08 1984-01-04 Canon Kk A semiconductor laser device and an image recording apparatus using the same
GB2181885A (en) * 1983-05-06 1987-04-29 Coherent Inc Power output control of laser
GB2154787A (en) * 1984-01-17 1985-09-11 Standard Telephones Cables Ltd Laser stabilisation circuit
GB2190783B (en) * 1986-05-13 1989-12-13 Litton Systems Inc Laser diode intensity and wavelength control
DE3715101A1 (en) * 1986-05-13 1987-11-19 Litton Systems Inc CONTROL OF INTENSITY AND WAVELENGTH OF A LASER DIODE
GB2190783A (en) * 1986-05-13 1987-11-25 Litton Systems Inc Laser diode intensity and wavelength control
US4792956A (en) * 1986-05-13 1988-12-20 Litton Systems, Inc. Laser diode intensity and wavelength control
US4842358A (en) * 1987-02-20 1989-06-27 Litton Systems, Inc. Apparatus and method for optical signal source stabilization
EP0604931A3 (en) * 1992-12-28 1995-01-25 Matsushita Electric Industrial Co Ltd Medical laser and apparatus for diagnosis and therapy using this laser.
US6214033B1 (en) 1992-12-28 2001-04-10 Matsushita Electric Industrial Co., Ltd. Medical laser apparatus and diagnostic/treatment apparatus using the medical laser apparatus
US6383175B1 (en) 1992-12-28 2002-05-07 Matsushita Electric Industrial Co., Ltd. Medical laser apparatus and diagnostic/treatment apparatus using the medical laser apparatus
US7016718B2 (en) 1992-12-28 2006-03-21 Matsushita Electric Industrial Co., Ltd. Medical laser apparatus and diagnostic/treatment apparatus using the medical laser apparatus
GB2360628A (en) * 2000-03-25 2001-09-26 Marconi Comm Ltd A stabilised radiation source
WO2001073904A1 (en) * 2000-03-25 2001-10-04 Marconi Communications Limited Stabilised radiation source
US6933485B2 (en) 2000-03-25 2005-08-23 Marconi Lik Intellectual Property Ltd. Stabilizing power and wavelength of output radiation from a stabilized radiation source in optical communications systems

Also Published As

Publication number Publication date
GB2007015B (en) 1982-03-17

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19981016