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Laser radar with adjustable local oscillator

  • US 4,850,041 A
  • Filed: 05/13/1987
  • Issued: 07/18/1989
  • Est. Priority Date: 05/13/1987
  • Status: Expired due to Fees
First Claim
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1. A laser diplexer, comprising:

  • (a) a laser for producing a laser beam polarized in a first direction;

    (b) a retardation plate interposed in the path of said laser beam, said plate being so oriented as to produce a beam having a transmit beam component polarized in said first direction and a local oscillator beam component polarized in a second direction perpendicular to said first direction;

    (c) a detector; and

    (d) a polarizer element interposed in the path of said transmit beam and said local oscillator beam so as to reflect said transmit beam toward a target, but refract said local oscillator beam toward said detector;

    (e) said polarizer element being also interposed in the path of the return signal from said target so as to refract the return signal beam polarized in said second direction, and(f) said diplexer further comprising optical means for orienting said return signal beam parallel and adjacent to said local oscillator beam toward said detector.

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