JPS55149043A - Light heterodyne detector - Google Patents

Light heterodyne detector

Info

Publication number
JPS55149043A
JPS55149043A JP5772179A JP5772179A JPS55149043A JP S55149043 A JPS55149043 A JP S55149043A JP 5772179 A JP5772179 A JP 5772179A JP 5772179 A JP5772179 A JP 5772179A JP S55149043 A JPS55149043 A JP S55149043A
Authority
JP
Japan
Prior art keywords
light
emitted
laser
angle
shift
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.)
Pending
Application number
JP5772179A
Other languages
Japanese (ja)
Inventor
Takayasu Fukuda
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5772179A priority Critical patent/JPS55149043A/en
Publication of JPS55149043A publication Critical patent/JPS55149043A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
    • G01J9/04—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by beating two waves of a same source but of different frequency and measuring the phase shift of the lower frequency obtained

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

PURPOSE:To obtain local oscillation light and make possible always stable light heterodyne detection by branching part of the emitted light of a laser for light source and applying a suitable frequency shift to this in a laser radar. CONSTITUTION:Infrared light from a CO2 laser 15 is led to a switch 6 via splitter 5 to make CW light to pulse light which is then subjected to TEA amplification 7 and is thence radiated to the observation target. On the other hand, the branched continuous wave is led to an acousto-optic A/O modulator 9a by a mirror 8 and the light emitted by an angle of theta by the excitation of an oscillator 10 is entered to an A/O modulator 9b, by which it again receives the shift of an angle theta and is thence emitted. The shift amount of this angle 2theta results in that the conditions as the local oscillation wave of a heterodyne detector of, e.g., 100MHz in intermediate frequency are provided. This shifted light is entered together with the incident light to a detecting element 2 by way of a mirror 11 and splitter 1.
JP5772179A 1979-05-10 1979-05-10 Light heterodyne detector Pending JPS55149043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5772179A JPS55149043A (en) 1979-05-10 1979-05-10 Light heterodyne detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5772179A JPS55149043A (en) 1979-05-10 1979-05-10 Light heterodyne detector

Publications (1)

Publication Number Publication Date
JPS55149043A true JPS55149043A (en) 1980-11-20

Family

ID=13063799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5772179A Pending JPS55149043A (en) 1979-05-10 1979-05-10 Light heterodyne detector

Country Status (1)

Country Link
JP (1) JPS55149043A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6363944A (en) * 1986-09-05 1988-03-22 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus for measuring dust in semiconductor production process
FR2675913A1 (en) * 1981-05-18 1992-10-30 Onera (Off Nat Aerospatiale) Infrared imager with heterodyne detection using an acoustooptic multiple-beam deflector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675913A1 (en) * 1981-05-18 1992-10-30 Onera (Off Nat Aerospatiale) Infrared imager with heterodyne detection using an acoustooptic multiple-beam deflector
JPS6363944A (en) * 1986-09-05 1988-03-22 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus for measuring dust in semiconductor production process

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