Linear FM chirp laser

Details Linear FM chirp laser Linear FM chirp laser

1983-03-17

1987-05-05

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

332 751, 356 285, G01C 308, G01P 336, H01S 300

Patent

active

046627413

ABSTRACT:
A laser radar system employing a linear FM chirp laser followed by post detection pulse compression by a surface acoustic wave (SAW) device. The heart of the invention is the FM chirp modulator that provides the needed tuning range and linearity for pulse compression. This modulation is accomplished by using a high pressure CO.sub.2 laser with an intracavity electric-optic modulator of CdTe. The frequency of the laser is controlled through the voltage applied to the crystal. With the performance the system offers, absolute radar ranges can be measured to 0.22 m and velocities to 0.37m/sec.

REFERENCES:
patent: 3363248 (1968-01-01), Nicodemus
patent: 3950100 (1976-04-01), Keene et al.
patent: 4190361 (1980-02-01), Dubrunfaut
patent: 4240746 (1980-12-01), Courtenay et al.
patent: 4284351 (1981-08-01), Alldritt et al.
patent: 4447149 (1984-05-01), Marcus et al.

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