Diffraction grating driven linear frequency chirped laser

Details Diffraction grating driven linear frequency chirped laser Diffraction grating driven linear frequency chirped laser

1992-04-21

1994-02-01

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Optical output stabilization

372102, 372 20, 372 9, 372 25, 372 28, H01S 313

Patent

active

052837955

ABSTRACT:
The present invention provides various embodiments of laser systems for generating "chirp" signals. In the broadest sense, a diffraction grating is placed within a laser cavity on the face of a carrier and the motion of the carrier in its own plane causes the laser to chirp. Typically, the diffraction grating is placed in the end-reflector position of the optical path of the resonant cavity associated with the laser. By putting the diffraction grating on the outer peripheral rim of a wheel and rotating the wheel, a sequence of either up-chirp or down-chirp signals can be generated continuously. Similarly, the desired "chirped" signals can be generated by using a diffraction grating oriented radially on the face of a rotating wheel. The system also contemplates the simultaneous generation of both an up-chirp signal of one polarization and a down-chirp signal of an orthogonal polarization by using a pair of lasers and a single wheel carrying the diffraction grating on either its outer peripheral rim or its face disposed in the end-reflector positions of the lasers for simultaneously generating both the up-chirp and down-chirp signals. An optical system including a reflective mirror, a one-half waveplate, and a polarizing beamsplitter are provided at the output of the two laser system for combining the up-chirp signal and down-chirp signal for simultaneous outputting.

REFERENCES:
patent: 4601036 (1986-07-01), Faxvog et al.
patent: 4862468 (1989-08-01), Fink
patent: 4868834 (1989-09-01), Fox et al.
patent: 4873692 (1989-10-01), Johnson et al.
patent: 4977574 (1990-12-01), Karube
patent: 5095492 (1992-03-01), Sandstrom

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