Optical system for producing controlled beat frequency

Details Optical system for producing controlled beat frequency Optical system for producing controlled beat frequency

1988-02-16

1989-07-25

Sikes, William L.

Coherent light generators

Particular beam control device

372 13, 372 18, 372 32, 307425, H01S 310

Patent

active

048521060

ABSTRACT:
An optical system for producing an optical output having a beat frequency. The shifter has a beam splitter for splitting a laser radiation generated by a laser source, into a first and a second laser beam, and includes an acoustooptical modulator for deflecting the first laser beam and thereby changing the frequency of the first laser beam. The shifter further has an optical-path changing device such as a convex lens or parabolic reflector for changing an optical path of the first laser beam deflected by the acoustooptical modulator, into parallelism with the optical axis of the changing device. The focal point of the optical-path changing device is located at a point of emission of the deflected first laser beam. A mixer is provided for mixing the deflected first laser beam with the second laser beam, thereby causing an interference between the first and second laser beams, to produce a beat frequency equal to a difference between the frequencies of the first and second laser beams.

REFERENCES:
patent: 3393955 (1968-07-01), Sterzer
patent: 3485559 (1969-12-01), De Maria
patent: 3517330 (1970-06-01), Doyle et al.
patent: 4284964 (1981-08-01), Maier, Jr.
patent: 4644267 (1987-02-01), Tsui et al.
Poon, Ting-Chung, "Method of Two-Dimensional Bipolar Incoherent Image Processing by Acousto-Optic Two-Pupil Synthesis", 2412 Optics Letters, May 10, 1985, No. 5, New York, pp. 197-199.
Wickramasinghe, H. K. et al., "Differential Phase Contrast Optical Microscope with 1 A-Depth Resolution", 8030 Electronics Letters, vol. 18, Oct. 1982, No. 22, London, pp. 973-975.

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