GB8420060D0 - Light emitting device - Google Patents

Light emitting device

Info

Publication number
GB8420060D0
GB8420060D0 GB848420060A GB8420060A GB8420060D0 GB 8420060 D0 GB8420060 D0 GB 8420060D0 GB 848420060 A GB848420060 A GB 848420060A GB 8420060 A GB8420060 A GB 8420060A GB 8420060 D0 GB8420060 D0 GB 8420060D0
Authority
GB
United Kingdom
Prior art keywords
light emitting
emitting device
light
emitting
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
GB848420060A
Other versions
GB2144912B (en
GB2144912A (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.)
Hitachi Ltd
Hitachi Iruma Electronic Co Ltd
Original Assignee
Hitachi Ltd
Hitachi Iruma Electronic 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 Hitachi Ltd, Hitachi Iruma Electronic Co Ltd filed Critical Hitachi Ltd
Publication of GB8420060D0 publication Critical patent/GB8420060D0/en
Publication of GB2144912A publication Critical patent/GB2144912A/en
Application granted granted Critical
Publication of GB2144912B publication Critical patent/GB2144912B/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
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • 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
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
    • H01S5/06216—Pulse modulation or generation
    • 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
    • H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
    • H01S5/0651—Mode control
    • H01S5/0652—Coherence lowering or collapse, e.g. multimode emission by additional input or modulation
    • 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
    • H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
    • H01S5/0658—Self-pulsating

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)
GB08420060A 1983-08-08 1984-08-07 Light emitting device and optical signal processing system employing the same Expired GB2144912B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58143879A JPS6035344A (en) 1983-08-08 1983-08-08 Light emitting device and optical signal processor using light emitting device

Publications (3)

Publication Number Publication Date
GB8420060D0 true GB8420060D0 (en) 1984-09-12
GB2144912A GB2144912A (en) 1985-03-13
GB2144912B GB2144912B (en) 1987-12-31

Family

ID=15349136

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08420060A Expired GB2144912B (en) 1983-08-08 1984-08-07 Light emitting device and optical signal processing system employing the same

Country Status (6)

Country Link
JP (1) JPS6035344A (en)
KR (1) KR850002707A (en)
DE (1) DE3429255A1 (en)
FR (1) FR2550645A1 (en)
GB (1) GB2144912B (en)
IT (1) IT1176571B (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS623534A (en) * 1985-06-28 1987-01-09 Sharp Corp Optical modulator
JPS62150732U (en) * 1986-03-17 1987-09-24
US4799069A (en) * 1986-04-18 1989-01-17 Minolta Camera Kabushiki Kaisha Laser recording apparatus
JPS6310333A (en) * 1986-06-30 1988-01-16 Pioneer Electronic Corp Optical information reader
JPH0746437B2 (en) * 1986-07-21 1995-05-17 株式会社日立製作所 Light head
EP0279404B1 (en) * 1987-02-20 1992-05-06 Siemens Aktiengesellschaft Laser transmitter arrangement
JPH0691296B2 (en) * 1987-03-31 1994-11-14 三菱電機株式会社 Assembling method of semiconductor laser
JPS6464139A (en) * 1987-09-04 1989-03-10 Hitachi Ltd Thin film optical pickup
DE3814583C1 (en) * 1988-04-27 1989-11-23 Krone Ag, 1000 Berlin, De
JPH0724112B2 (en) * 1988-12-19 1995-03-15 ローム株式会社 How to install the laser diode unit
US5233580A (en) * 1988-12-19 1993-08-03 Rohm Co., Ltd. Laser diode unit welded to a mounting member by laser light
JPH04186535A (en) * 1990-11-20 1992-07-03 Mitsubishi Electric Corp Optical information replay unit
DE4127859A1 (en) * 1991-08-22 1993-07-08 Teldix Gmbh DEVICE FOR MEASURING THE SPEED
US5455704A (en) * 1991-11-08 1995-10-03 Mitsubishi Denki Kabushiki Kaisha Optical-fiber light amplifier
EP0541061B1 (en) * 1991-11-08 1997-07-02 Mitsubishi Denki Kabushiki Kaisha Optical-fiber light amplifier
JPH06349098A (en) * 1993-06-07 1994-12-22 Canon Inc Optical information recording/reproducing device
JP3247919B2 (en) * 1993-07-19 2002-01-21 三菱電機株式会社 Optical amplifier
JP3780650B2 (en) * 1997-08-05 2006-05-31 ソニー株式会社 Method for setting average optical output of semiconductor laser and method for setting superposition condition of high-frequency current of semiconductor laser
US6151290A (en) * 1998-02-05 2000-11-21 Sony Corporation Inexpensive safe light beam recorder
WO2000048179A1 (en) * 1999-02-11 2000-08-17 Sony Electronics, Inc. Inexpensive safe light beam recorder
JP4376013B2 (en) 2002-11-11 2009-12-02 シャープ株式会社 Semiconductor laser device
JP5234238B2 (en) 2006-02-22 2013-07-10 日亜化学工業株式会社 Optical disk device
JP2009104753A (en) * 2007-10-25 2009-05-14 Toshiba Corp Optical head device and information recording/reproducing apparatus using the same
US8750341B2 (en) * 2008-01-04 2014-06-10 Mindspeed Technologies, Inc. Method and apparatus for reducing optical signal speckle
GB2468716A (en) 2009-03-20 2010-09-22 Univ Dublin City An optical wavelength comb generator device
US20120044279A1 (en) * 2009-04-27 2012-02-23 Hiroshi Uchino Image Projection Apparatus and Laser Beam Projection Apparatus

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641459A (en) * 1969-06-16 1972-02-08 Bell Telephone Labor Inc Apparatus and method for narrowing the pulse width and stabilizing the repetition rate in semiconductor lasers exhibiting self-induced pulsing
US3723903A (en) * 1971-05-13 1973-03-27 Bell Telephone Labor Inc Dynamic fm control of the transverse modes of a self-pulsing semiconductor laser
NL7312139A (en) * 1972-09-08 1974-03-12
DE2330310A1 (en) * 1973-06-14 1975-01-16 Siemens Ag METHOD FOR PULSE MODULATION OF SEMI-CONDUCTOR LASERS
US4079339A (en) * 1975-05-17 1978-03-14 Nippon Electric Company, Ltd. Light self-injecting semiconductor laser device
DE2534889C2 (en) * 1975-08-05 1981-09-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method for amplifying the modulation depth of the optical output signal or the electrical output signal of a semiconductor injection laser generated by coupling in an optical signal, and an arrangement for carrying out the method
NL8004159A (en) * 1979-08-03 1981-01-22 Hitachi Ltd OPTICAL RECORDING DEVICE.
JPS5647933A (en) * 1979-09-25 1981-04-30 Sony Corp Optical signal head
US4317236A (en) * 1980-02-25 1982-02-23 Bell Telephone Laboratories, Incorporated Laser digital transmitter
JPS57200912A (en) * 1981-06-04 1982-12-09 Pioneer Electronic Corp Information recording system

Also Published As

Publication number Publication date
GB2144912B (en) 1987-12-31
IT8422244A0 (en) 1984-08-07
FR2550645A1 (en) 1985-02-15
JPS6035344A (en) 1985-02-23
IT1176571B (en) 1987-08-18
DE3429255A1 (en) 1985-02-28
KR850002707A (en) 1985-05-15
GB2144912A (en) 1985-03-13

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940807