GB1055613A - Frequency stabilisation of gas masers - Google Patents

Frequency stabilisation of gas masers

Info

Publication number
GB1055613A
GB1055613A GB3927664A GB3927664A GB1055613A GB 1055613 A GB1055613 A GB 1055613A GB 3927664 A GB3927664 A GB 3927664A GB 3927664 A GB3927664 A GB 3927664A GB 1055613 A GB1055613 A GB 1055613A
Authority
GB
United Kingdom
Prior art keywords
reflectors
laser
frequency
tilt
input
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
GB3927664A
Inventor
Koichi Shimoda
Kazuo Ito
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.)
Jeol Ltd
Original Assignee
Jeol Ltd
Nihon Denshi KK
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 Jeol Ltd, Nihon Denshi KK filed Critical Jeol Ltd
Priority to GB3927664A priority Critical patent/GB1055613A/en
Publication of GB1055613A publication Critical patent/GB1055613A/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
    • H01S3/139—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
    • 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
    • H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
    • H01S3/134—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation in gas lasers

Landscapes

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

Abstract

1, 055, 613. Photo-electric control of laser frequency. NIHON DENSHI KABUSHIKI KAISHA. Sept. 25, 1964, No. 39276/64. Heading G1A. [Also in Divisions H1 and H3] The frequency of a gaseous optical maser (laser) is stabilized by frequency modulating the resonance tuning of the laser and detecting the fundamental and harmonic components of the modulating frequency in the laser output, then feeding the detected outputs to vary the horizontal and vertical tilt angles of the reflectors (to maintain them parallel), and their distance apart, and also to keep constant the pumping input power and output of the laser. The reflectors 2a, 2b are mounted on end plates spaced by four invar rods carrying current input windings 6a-6d, 7a, 7d and 8c, 8d which when energized vary by magnetostriction, the tilt and separation apart of the reflectors. Modulating frequencies e.g. 70 c/s and 25 c/s are applied to certain of the windings and from the partially translucent reflector 2b the light output is detected and amplified by a photo-multiplier tube. The fundamental, second and third harmonics of the 70 c/s input, separated by narrow band amplifiers, respectively provide a measure of (1) pumping input power variation (2) tilt of the reflectors in one direction, and (3) separation of the reflectors; and after detection in phase sensitive rectifiers and amplifying, are then respectively applied as automatic gain control to the pumping source, and to control windings on the invar rods to correct reflector tilt in one plane, and separation of the reflectors. The other input, 25 c/s, similarly corrects tilt in a plane at right angles to the first. The laser is so controlled that the first, second and third derivatives of the input power are all zero. The discharge tube 1 (containing a neon and helium mixture) is supported between the mirrors 2a, 2b and end plates by bellows 4a, 4b. The frequency 75 c/s and its harmonics may be derived by frequency division from a 450 c/s source.
GB3927664A 1964-09-25 1964-09-25 Frequency stabilisation of gas masers Expired GB1055613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3927664A GB1055613A (en) 1964-09-25 1964-09-25 Frequency stabilisation of gas masers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3927664A GB1055613A (en) 1964-09-25 1964-09-25 Frequency stabilisation of gas masers

Publications (1)

Publication Number Publication Date
GB1055613A true GB1055613A (en) 1967-01-18

Family

ID=10408662

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3927664A Expired GB1055613A (en) 1964-09-25 1964-09-25 Frequency stabilisation of gas masers

Country Status (1)

Country Link
GB (1) GB1055613A (en)

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