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US 4,751,706 AGranted
Laser for providing rapid sequence of different wavelengths
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsRobert S. Rohde, Jeffrey L. Ahl
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Abstract
The optical cavity of the present laser has a folded optical path with a pair of reflective diffraction gratings and a gain cell in it. A disk with radially distributed perforations rotates in the optical path between the gratings and the gain cell. The laser wavelength depends upon which perforation is aligned with the slot in a slotted plate also in the optical path. The laser output consists of a sequence of different wavelength but colinear rays.
Claims2
A stable laser for providing a rapid sequence of laser beams of different wavelengths, including:
- a lasing medium;
- means for pumping said medium;
- an optical cavity having a laser beam optical path, including the series arrangement of:
- a partially transparent mirror,
- a pair of reflective diffraction gratings,
- a rotating aperture disc,
- a slotted plate,
- a fully reflective mirror, wherein the lasing medium is between the gratings and the partially transparent mirror;
- and an encoder responsive to the rotation of said disc and providing a signal to said means for pumping, whereby said means for pumping operates whenever an aperture of said disc is aligned with the slot in said slotted plate, wherein a laser beam exits said medium in response to pumping thereof, is reflected by one diffraction grating of said pair of reflective diffraction gratings to the other diffraction grating of said pair, is reflected by the other grating through an aperture in said disc and through said slot, is retroreflected by said fully reflective mirror back along the same path to and then through said lasing medium, and is partially retroreflected by said partially transparent mirror.
6 more elements
Dependencies are inferred from the claim text.