GB1255807A - Method and apparatus for generating stable coherent pulses of optical radiation - Google Patents

Method and apparatus for generating stable coherent pulses of optical radiation

Info

Publication number
GB1255807A
GB1255807A GB6108768A GB6108768A GB1255807A GB 1255807 A GB1255807 A GB 1255807A GB 6108768 A GB6108768 A GB 6108768A GB 6108768 A GB6108768 A GB 6108768A GB 1255807 A GB1255807 A GB 1255807A
Authority
GB
United Kingdom
Prior art keywords
resonator
optical path
mirror
laser
mirrors
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.)
Expired
Application number
GB6108768A
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Publication of GB1255807A publication Critical patent/GB1255807A/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
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106—Mode locking
    • H01S3/1109—Active mode locking
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/082—Construction or shape of optical resonators or components thereof comprising three or more reflectors defining a plurality of resonators, e.g. for mode selection or suppression
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083—Ring lasers
    • 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
    • H01S3/107—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 electro-optic devices, e.g. exhibiting Pockels or Kerr effect
    • 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
    • H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
    • H01S3/1398—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length by using a supplementary modulation of the output

Abstract

1,255,807. Lasers. NIPPON TELEGRAPH & TELEPHONE PUBLIC CORP. 23 Dec., 1968 [25 Dec., 1967], No. 61087/68. Heading H1C. A laser produces a train of pulses having a repetition frequency which is a multiple p of the axial mode separation C/2L, the pulse train being produced as a result of (a) an auxiliary resonator, and (b) modulation of the optical emission within the resonator at a frequency corresponding to the repetition frequency. In one arrangement, Fig. 2, an He-Ne gas discharge tube 7 is located in a primary resonator formed by mirrors 2, 21, and the optical path length is disturbed periodically at the repetition frequency by an electrooptic crystal 8 excited by a modulating signal source 16. The auxiliary resonator is formed by mirrors 21 and 15 which are coupled by a beam splitter 12 of low reflectivity, the auxiliary resonator causing the Q factor of the primary resonator to vary periodically within the band width of the emitted radiation. The auxiliary resonator is arranged so that its optical path length is 1/p of the optical path length of the main resonator. An alternative arrangement, Fig. 7, uses a YAG laser rod 17 which is pumped by tungsten lamp 20, the rod and lamp being located at respective foci of an elliptical reflector 21. A duct is formed by a quartz tube 19 for circulated cooling water. The resonator is defined by mirrors 2, 25 of which mirror 2 is axially displaceable by a hollow cylinder of piezo-electric material 34, while mirror 25 is formed on part of a fused quartz block 24 which incorporates the beam splitter and the auxiliary resonator reflector 26. Phase modulation is effected by a crystal 8, e.g. LiTaO 3 , which is housed in a microwave resonator 27 and is energized by a modulating signal source 16. The oscillatory mode is stabilized by using a photo-detector 30 in the laser output path and passing the detector output through a narrow band-pass filter 31 where it is compared with the modulating signal in a phase-sensitive detector 32. Any deviation detected by the phase detector is amplified at 33 and is applied to the piezo-electric cylinder 34 to axially adjust the mirror 2. An interferometer of the Michelson type is used in Fig. 8 and comprises quartz components 35, 36 with their boundary surfaces coupled by a dielectric film 37 to form the low reflectivity beam splitter. Use of a beam splitter is avoided in Fig. 9 by providing a fused quartz block 40 in the laser optical path, the block having polished end surfaces with one end 41 coated with reflecting material to form the resonator mirror. A ring laser is also described, Fig. 10, which comprises four laser active media 17 and corner reflecting mirrors 43-46 forming a closed optical path including a modulator 8. Mirror 46 is slightly transmissive and couples a second ring optical path formed by mirrors 47-49 to the primary ring, the second ring path length being 1/p of the primary ring path length.
GB6108768A 1967-12-25 1968-12-23 Method and apparatus for generating stable coherent pulses of optical radiation Expired GB1255807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8282267 1967-12-25

Publications (1)

Publication Number Publication Date
GB1255807A true GB1255807A (en) 1971-12-01

Family

ID=13785078

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6108768A Expired GB1255807A (en) 1967-12-25 1968-12-23 Method and apparatus for generating stable coherent pulses of optical radiation

Country Status (3)

Country Link
DE (1) DE1816337A1 (en)
GB (1) GB1255807A (en)
NL (1) NL144452B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2161980A (en) * 1984-05-25 1986-01-22 British Telecomm Mode-locked laser light sources
EP0294787A2 (en) * 1987-06-09 1988-12-14 Hamamatsu Photonics K.K. Highly repetitively pulsed laser device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291282A (en) * 1979-09-07 1981-09-22 The Research Foundation Of The City University Of New York Stabilized pulse producing mode locked laser system
US4660205A (en) * 1985-05-13 1987-04-21 Allied Corporation Multi-resonator switching laser

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2161980A (en) * 1984-05-25 1986-01-22 British Telecomm Mode-locked laser light sources
US4665524A (en) * 1984-05-25 1987-05-12 British Telecommunications Plc Mode locked laser light sources
EP0294787A2 (en) * 1987-06-09 1988-12-14 Hamamatsu Photonics K.K. Highly repetitively pulsed laser device
EP0294787A3 (en) * 1987-06-09 1992-06-03 Hamamatsu Photonics K.K. Highly repetitively pulsed laser device

Also Published As

Publication number Publication date
DE1816337A1 (en) 1969-11-13
DE1816337B2 (en) 1970-11-12
NL144452B (en) 1974-12-16
NL6818671A (en) 1969-06-27

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