GB1248405A - Q-switched lasers - Google Patents

Q-switched lasers

Info

Publication number
GB1248405A
GB1248405A GB52188/68A GB5218868A GB1248405A GB 1248405 A GB1248405 A GB 1248405A GB 52188/68 A GB52188/68 A GB 52188/68A GB 5218868 A GB5218868 A GB 5218868A GB 1248405 A GB1248405 A GB 1248405A
Authority
GB
United Kingdom
Prior art keywords
etalon
laser
spacing
optical spacing
optical
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
GB52188/68A
Inventor
Ian Winstone Mackintosh
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.)
SEC DEP FOR DEFENCE FORMERLY M
UK Secretary of State for Defence
Original Assignee
SEC DEP FOR DEFENCE FORMERLY M
UK Secretary of State for Defence
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 SEC DEP FOR DEFENCE FORMERLY M, UK Secretary of State for Defence filed Critical SEC DEP FOR DEFENCE FORMERLY M
Priority to GB52188/68A priority Critical patent/GB1248405A/en
Publication of GB1248405A publication Critical patent/GB1248405A/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
    • H01S3/1062—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 a controlled passive interferometer, e.g. a Fabry-Perot etalon
    • 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
    • H01S3/1123—Q-switching
    • 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
    • H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

1,248,405. Lasers. DEFENCE, SECRETARY OF. 30 Oct., 1969 [4 Nov., 1968], No. 52188/68. Heading H1C. Laser Q-switching is effected by periodically varying the optical spacing between the plates of a Fabry Perot etalon forming one of the resonator mirrors. As shown in Fig. 1, a neodymium-doped yttrium aluminium garnet laser rod 1 is located in a resonator comprising a dielectric mirror 3 and a Fabry Perot etalon 6 formed by dielectric mirrors 7a, 7b, the optical spacing of the etalon being determined by a hollow piezo-electric cylindrical transducer 9. The optical spacing is varied periodically by a pulse generator 27 and the mean spacing is determined by a D.C. bias from an amplifier 25. This bias is adjusted to maintain the etalon optical spacing constant by superimposing a 70 Hz. modulation from an oscillator 23, the modulated laser output being detected by using a beam splitter 13 and a photo-diode 15 so as to produce a feedback signal which passes through a pulse stretcher 17 and a tuned amplifier 19 to a phase-sensitive detector 21. If the phase of the feedback signal differs from that of the oscillator 23, the detector 21 adjusts the D.C. bias to a compensating level. A modified laser is described, Fig. 2, in which two Fabry Perot etalons are used, one etalon 33 having a fixed optical spacing and being located within the resonator, while the other etalon 35 functions as a variable resonator mirror and consists of dielectric mirrors 37a, 37b on flats 34, 36 adjustably spaced by a transducer 41. Etalon 33 is inclined with respect to the optical axis to reflect light of certain frequencies out of the system which might otherwise give rise to laser action at those times when etalon 35 is non- reflective. The combination of two etalons 33, 35 effects laser action by the change of optical spacing of one etalon relative to the other, a laser pulse being produced each time a spacing relationship is obtained in which etalon 33 is transmissive and etalon 35 reflective. Continuous pumping may be used. Instead of altering the physical distance between etalon mirrors, the optical spacing may be varied by change of refractive index using the electrooptic effect.
GB52188/68A 1968-11-04 1968-11-04 Q-switched lasers Expired GB1248405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB52188/68A GB1248405A (en) 1968-11-04 1968-11-04 Q-switched lasers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB52188/68A GB1248405A (en) 1968-11-04 1968-11-04 Q-switched lasers

Publications (1)

Publication Number Publication Date
GB1248405A true GB1248405A (en) 1971-10-06

Family

ID=10462968

Family Applications (1)

Application Number Title Priority Date Filing Date
GB52188/68A Expired GB1248405A (en) 1968-11-04 1968-11-04 Q-switched lasers

Country Status (1)

Country Link
GB (1) GB1248405A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0229285A2 (en) * 1986-01-09 1987-07-22 Feinmechanische Werke Halle GmbH Method and Arrangement for the generation of high-power CO2-laser pulses
EP0229284A2 (en) * 1986-01-09 1987-07-22 Feinmechanische Werke Halle GmbH Method and arrangement for wavelength-selective internal intensity modulation of CO2 high-power lasers and for radiation pulse generation in such lasers
WO1991003849A1 (en) * 1989-09-07 1991-03-21 Massachusetts Institute Of Technology Coupled-cavity q-switched laser
US5132977A (en) * 1989-09-07 1992-07-21 Massachusetts Institute Of Technology Coupled-cavity Q-switched laser
WO2009070849A1 (en) * 2007-12-05 2009-06-11 The Australian National University Spectroscopic detection system and method
CN117559207A (en) * 2024-01-10 2024-02-13 闽都创新实验室 High-precision narrow linewidth wavelength adjustable pulse laser output method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0229285A2 (en) * 1986-01-09 1987-07-22 Feinmechanische Werke Halle GmbH Method and Arrangement for the generation of high-power CO2-laser pulses
EP0229284A2 (en) * 1986-01-09 1987-07-22 Feinmechanische Werke Halle GmbH Method and arrangement for wavelength-selective internal intensity modulation of CO2 high-power lasers and for radiation pulse generation in such lasers
EP0229285A3 (en) * 1986-01-09 1989-04-12 Veb Kombinat Feinmechanische Werke Halle Arrangement for the generation of high-power co2-laser pulses
EP0229284A3 (en) * 1986-01-09 1989-04-26 Veb Kombinat Feinmechanische Werke Halle Arrangement for wavelength-selective internal intensity modulation of co2 high-power lasers and for radiation pulse generation in such lasers
WO1991003849A1 (en) * 1989-09-07 1991-03-21 Massachusetts Institute Of Technology Coupled-cavity q-switched laser
US5132977A (en) * 1989-09-07 1992-07-21 Massachusetts Institute Of Technology Coupled-cavity Q-switched laser
USRE34812E (en) * 1989-09-07 1994-12-27 Massachusetts Institute Of Technology Coupled-cavity Q-switched laser
WO2009070849A1 (en) * 2007-12-05 2009-06-11 The Australian National University Spectroscopic detection system and method
US8472022B2 (en) 2007-12-05 2013-06-25 The Australian National University Spectroscopic detection system and method
AU2008331441B2 (en) * 2007-12-05 2014-07-17 The Australian National University Spectroscopic detection system and method
CN117559207A (en) * 2024-01-10 2024-02-13 闽都创新实验室 High-precision narrow linewidth wavelength adjustable pulse laser output method
CN117559207B (en) * 2024-01-10 2024-04-26 闽都创新实验室 High-precision narrow linewidth wavelength adjustable pulse laser output method

Similar Documents

Publication Publication Date Title
US5659419A (en) Tunable narrowband optical parametrical oscillator
US3975693A (en) Dual function laser for space laser communications
US3243722A (en) Maser frequency control systems using refractive index change
US3588738A (en) Frequency stabilized laser
GB1272727A (en) Travelling-wave regenerative laser amplifier
US3775699A (en) Laser having a gas-filled fabry-perot etalon mode selector
US5383198A (en) Self-starting mode-locked ring cavity laser
US3327243A (en) Laser tuning and modulating system having an external feedback path
GB1272726A (en) Servo aided injection phase-locked laser oscillator
GB1406293A (en) Lasers
GB1321389A (en) Laser relaxation oscillators
US3764937A (en) Frequency controlled, passively q-switch laser
US3869680A (en) Dually mode-locked nd:yag laser
GB1248405A (en) Q-switched lasers
US3676799A (en) Frequency stabilized laser
US3534289A (en) Laser system with optical discriminator
US7026594B2 (en) Method and device for producing radio frequency waves
US3866139A (en) Apparatus for laser frequency selection
US3663897A (en) Method of modulating a laser beam and related apparatus
GB1075658A (en) Improvements in or relating to lasers or masers
US4928282A (en) Laser generator with phase mode-locking
US4326175A (en) Multi-color, multi-pulse laser system
CN114899688A (en) Device and method for generating polarization multiplexing dual-optical-frequency comb
GB1390832A (en) Pulse-operated laser systems
US3559102A (en) Ultra-high-speed laser light pulse generator