GB1371381A - Electromagnetic wave propagating means - Google Patents

Electromagnetic wave propagating means

Info

Publication number
GB1371381A
GB1371381A GB201971A GB201971A GB1371381A GB 1371381 A GB1371381 A GB 1371381A GB 201971 A GB201971 A GB 201971A GB 201971 A GB201971 A GB 201971A GB 1371381 A GB1371381 A GB 1371381A
Authority
GB
United Kingdom
Prior art keywords
mirror
laser
ring
jan
chosen
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
GB201971A
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB201971A priority Critical patent/GB1371381A/en
Publication of GB1371381A publication Critical patent/GB1371381A/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
    • H01S3/05—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

Landscapes

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

Abstract

1371381 Lasers EMI Ltd 11 Jan 1972 [15 Jan 1971] 2019/71 Heading H1C In a ring laser, mode locking between the two counterrotating beams due to back scattering of the beams from imperfections in a planar corner mirror is cancelled by vibrating the mirror in the plane of its reflecting surface. The ring laser is thus able to measure low rotation rates when used as a compass. In the embodiment of the figure a mirror 1 at a corner of the ring is vibrated in its plane, as shown by arrow 6. The vibration is chosen to reduce a spectral component of the back-scattered wave corresponding to the laser circulating frequency. The vibration may also be chosen so that the first order sideband components of the scattered wave lie outside the operating band of frequencies of the laser system. The vibrations may be produced by a piezoelectric device.
GB201971A 1972-01-11 1972-01-11 Electromagnetic wave propagating means Expired GB1371381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201971A GB1371381A (en) 1972-01-11 1972-01-11 Electromagnetic wave propagating means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201971A GB1371381A (en) 1972-01-11 1972-01-11 Electromagnetic wave propagating means

Publications (1)

Publication Number Publication Date
GB1371381A true GB1371381A (en) 1974-10-23

Family

ID=9732165

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201971A Expired GB1371381A (en) 1972-01-11 1972-01-11 Electromagnetic wave propagating means

Country Status (1)

Country Link
GB (1) GB1371381A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees