GB2007015A - Control apparatus - Google Patents
Control apparatusInfo
- 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
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
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>
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)
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 |
EP0604931A2 (en) * | 1992-12-28 | 1994-07-06 | Matsushita Electric Industrial Co., Ltd. | Medical laser apparatus and diagnosing/curing apparatus using the medical laser apparatus |
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 |
-
1978
- 1978-10-17 GB GB7840816A patent/GB2007015B/en not_active Expired
Cited By (16)
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 |
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 |
GB2190783B (en) * | 1986-05-13 | 1989-12-13 | 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 |
EP0604931A2 (en) * | 1992-12-28 | 1994-07-06 | Matsushita Electric Industrial Co., Ltd. | Medical laser apparatus and diagnosing/curing apparatus using the medical laser apparatus |
EP0604931A3 (en) * | 1992-12-28 | 1995-01-25 | Matsushita Electric Ind Co Ltd | Medical laser apparatus and diagnosing/curing apparatus using the medical laser apparatus. |
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 |