GB1096595A - Improvements in or relating to laser devices suitable for wide-band communication - Google Patents

Improvements in or relating to laser devices suitable for wide-band communication

Info

Publication number
GB1096595A
GB1096595A GB1362865A GB1362865A GB1096595A GB 1096595 A GB1096595 A GB 1096595A GB 1362865 A GB1362865 A GB 1362865A GB 1362865 A GB1362865 A GB 1362865A GB 1096595 A GB1096595 A GB 1096595A
Authority
GB
United Kingdom
Prior art keywords
tem
laser
order
modes
same order
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
GB1362865A
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.)
NEC Corp
Original Assignee
Nippon Electric Co 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 Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Publication of GB1096595A publication Critical patent/GB1096595A/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
    • H01S3/08018—Mode suppression
    • H01S3/0804—Transverse or lateral modes
    • H01S3/0805—Transverse or lateral modes by apertures, e.g. pin-holes or knife-edges

Landscapes

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

Abstract

1,096,595. Lasers. NIPPON ELECTRIC CO. Ltd. March 31, 1965 [July 20, 1964], No. 13628/65. Heading H1C. The output of a laser is controlled by preventing the generation of more than one transverse mode of each order. In a gas laser a mode control plate 15 is provided at a distance a from the laser axis 13 and between the laser tube and one of the cavity mirrors. By preventing formation of an upper beam 18, the formation of the lower beam 18, of the same order and symmetrically disposed with respect to axis 13, is also prevented. A virtual mode control plate 15<SP>1</SP> is thus effectively provided, leaving a slit 16 of width 2a. The distance a is selected so that passage of only one of the transverse modes of each order is possible. Beams 17 are of the same order as beams 18 which are blocked. It is stated that spatially independent modes of the same order e.g. TEM 02 , TEM 11 and TEM 20 tend to oscillate at slightly different frequencies so that wide band communication using the laser beam becomes difficult, whereas elimination of, say, modes TEM 11 and TEM 20 removes the adjacent frequencies without substantially attenuating the output. Instead of a plate 15 non-reflective portions may be formed on one of the cavity mirrors, or opaque portions may be formed on the Brewster windows of a gas laser. Spherical mirrors having the same or different radii of curvature may be used for the resonator, or one may be a plane mirror.
GB1362865A 1964-07-20 1965-03-31 Improvements in or relating to laser devices suitable for wide-band communication Expired GB1096595A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4114064 1964-07-20

Publications (1)

Publication Number Publication Date
GB1096595A true GB1096595A (en) 1967-12-29

Family

ID=12600111

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1362865A Expired GB1096595A (en) 1964-07-20 1965-03-31 Improvements in or relating to laser devices suitable for wide-band communication

Country Status (1)

Country Link
GB (1) GB1096595A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562343A1 (en) * 1984-03-30 1985-10-04 Spectra Physics METHODS AND APPARATUSES FOR MAXIMIZING THE OUTPUT POWER OF A GAS LASER
GB2196471A (en) * 1986-09-22 1988-04-27 Us Energy Reducing or eliminating secondary modes in dye laser oscillator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562343A1 (en) * 1984-03-30 1985-10-04 Spectra Physics METHODS AND APPARATUSES FOR MAXIMIZING THE OUTPUT POWER OF A GAS LASER
GB2157484A (en) * 1984-03-30 1985-10-23 Spectra Physics Maximizing the power output of a gas laser
GB2196471A (en) * 1986-09-22 1988-04-27 Us Energy Reducing or eliminating secondary modes in dye laser oscillator
US4780878A (en) * 1986-09-22 1988-10-25 The United States Of America As Represented By The United States Department Of Energy Techniques for reducing and/or eliminating secondary modes in a dye laser oscillator
GB2196471B (en) * 1986-09-22 1990-10-17 Us Energy Techniques for reducing and/or eliminating secondary modes in a dye laser oscillator

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