GB1025185A - Improvements in or relating to signalling systems - Google Patents

Improvements in or relating to signalling systems

Info

Publication number
GB1025185A
GB1025185A GB4626963A GB4626963A GB1025185A GB 1025185 A GB1025185 A GB 1025185A GB 4626963 A GB4626963 A GB 4626963A GB 4626963 A GB4626963 A GB 4626963A GB 1025185 A GB1025185 A GB 1025185A
Authority
GB
United Kingdom
Prior art keywords
tube
quartz
amplifier
frequencies
helium
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
GB4626963A
Inventor
James Clifford North
Eric Wilfred Ayers
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB4626963A priority Critical patent/GB1025185A/en
Priority to NL6413535A priority patent/NL6413535A/xx
Priority to DEP35543A priority patent/DE1223969B/en
Publication of GB1025185A publication Critical patent/GB1025185A/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
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2308—Amplifier arrangements, e.g. MOPA
    • 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
    • H01S3/02—Constructional details
    • H01S3/03—Constructional details of gas laser discharge tubes
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/097—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser
    • H01S3/0975—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser using inductive or capacitive excitation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

1,025,185. Lasers. HER MAJESTY'S POSTMASTER GENERAL. Nov. 19, 1964 [Nov. 22, 1963], No. 46269/63. Heading H3B. A gaseous laser oscillator drives a laser amplifier. As shown in Fig. 1, a helium-neon laser oscillator 1 operating at low power in a single oscillation mode is pumped by radio frequency energy applied to electrodes 5 and has external concave spherical mirrors 4 defining an optical cavity. The gas is contained in a quartz tube 2 having its ends closed by quartz windows 3 set at the Brewster angle. The output radiation 6 is applied, e.g. through a light pipe, to a gaseous laser amplifier 7 which may use helium-neon, xenon-helium or xenon alone as the active medium. An elongated tube 8 without reflectors is used and the amplifier is pumped by a D.C. discharge between electrodes 10, 11 initiated by a heated cathode. The tube 8 may consist of quartz glass, ceramic, or plastic and the end windows 9, which may be set at the Brewster angle, may be of glass, quartz, plastic, germanium or silicon. Filters 15, Fig. 2 (not shown), may be included in the tube 8 to absorb radiation at unwanted frequencies. Modulation with the arrangement used in a signalling system may be effected by Kerr cells. The amplifier 7 may serve as a one-way or two-way repeater, and where signal transmission is effected through light pipes may have absorbing material 16, Fig. 3 (not shown), at the entrance of tube 8 to suppress those light rays out of parallel with the tube axis. Two signal frequencies transmitted over a common path 17, Fig. 4, may be amplified by the use of separate lasers 21, 25 for the two frequencies, the appropriate light rays being directed into paths 19, 20 by mirrors 18, 22, 23, 24, which are selectively reflective and transmissive at different frequencies.
GB4626963A 1963-11-22 1963-11-22 Improvements in or relating to signalling systems Expired GB1025185A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4626963A GB1025185A (en) 1963-11-22 1963-11-22 Improvements in or relating to signalling systems
NL6413535A NL6413535A (en) 1963-11-22 1964-11-20
DEP35543A DE1223969B (en) 1963-11-22 1964-11-21 Optical transmitter with downstream optical amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4626963A GB1025185A (en) 1963-11-22 1963-11-22 Improvements in or relating to signalling systems

Publications (1)

Publication Number Publication Date
GB1025185A true GB1025185A (en) 1966-04-06

Family

ID=10440539

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4626963A Expired GB1025185A (en) 1963-11-22 1963-11-22 Improvements in or relating to signalling systems

Country Status (3)

Country Link
DE (1) DE1223969B (en)
GB (1) GB1025185A (en)
NL (1) NL6413535A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016054206A1 (en) * 2014-09-30 2016-04-07 Li-Cor, Inc. Laser beam stop elements and spectroscopy systems including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016054206A1 (en) * 2014-09-30 2016-04-07 Li-Cor, Inc. Laser beam stop elements and spectroscopy systems including the same
US9759655B2 (en) 2014-09-30 2017-09-12 Li-Cor, Inc. Laser beam stop elements and spectroscopy systems including the same

Also Published As

Publication number Publication date
DE1223969B (en) 1966-09-01
NL6413535A (en) 1965-05-24

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