Rapidly switchable line selector for pulsed lasers

Details Rapidly switchable line selector for pulsed lasers Rapidly switchable line selector for pulsed lasers

1987-04-27

1989-08-29

Sikes, William L.

Communications: directive radio wave systems and devices (e.g.,

Radar ew

Eccm

372 15, 372 23, 372 93, 372102, H01S 3098

Patent

active

048624683

ABSTRACT:
A first embodiment includes a set of diffraction gratings on the face of a wheel, each grating being set at an angle to select a different spectral line. The wheel is rotated, and as each grating moves into the end-reflector position of the laser's optical path, the laser is fired. Alternate embodiments include a small spinning fold mirror that reflects the beam in a circle about the axis of the laser. Such embodiments include (a) a circular array of diffraction gratings arranged about the laser axis such that the tilt of the gratings and the orientation of the grooves vary as one goes around the circle and successively fires the laser at each grating; (b) both a circular array of mirrors and a corresponding array of diffraction gratings such that the grooves of all of the gratings are parallel and the gratings are all tilted in the same direction; and (c) two spinning fold mirrors and two circular arrays of mirrors giving a double fold plus a single diffraction grating wherein the optical paths are not parallel but arrive at the grating at different angles for selecting different spectral lines.

REFERENCES:
patent: 3443243 (1969-05-01), Patel
patent: 4241318 (1980-12-01), Comera et al.
patent: 4399540 (1983-08-01), Bucher
Dewey; "Scanning A Focused Light Beam Using Two Synchronized Mirrors"; IBM Tech. Disclosure; vol. 17; No. 9, Feb. 1975; p. 2743.
McGraw-Hill Encyclopedia of Science & Technology, vol. 9, pp. 579-581.

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