Coherent light generators – Particular beam control device – Producing plural wavelength output
Patent
1984-05-03
1985-01-15
Sikes, William L.
Coherent light generators
Particular beam control device
Producing plural wavelength output
372 20, 372101, 372 95, 372 19, 35016212, H01S 3098
Patent
active
044942354
ABSTRACT:
A pulsed or CW laser is rapidly switched to operate at one or more selectable wavelengths by means of intracavity insertion of beam dispersion and focussing elements and an apertured focal plane mask and shutter assembly. The laser beam has an axis and is dispersed into components or sub-beams having different axes and representing different wavelengths, the sub-beams being focussed to substantially reduced diameters on the focal plane mask at points, respectively, at which apertures are formed. Movable shutters adjacent to the respective apertures control alternate opening of and closing of the apertures and selectively permit the laser to resonate at at least one of a plurality of wavelengths corresponding to that of the sub-beam passing through an open aperture. Mask apertures having very small diameters (<50 microns) and separations are achieved enabling switching between different operating wavelengths in milliseconds. By focussing the sub-beams on the focal plane of the focussing element, the spatial distribution of the sub-beams at infinity is transformed to the focal plane thereby enhancing spectral selectivity with minimum space requirements.
REFERENCES:
patent: 3623024 (1971-11-01), Hamilton
patent: 3729634 (1973-04-01), Jensen et al.
patent: 3961841 (1976-06-01), Giordmaine
patent: 3977771 (1976-08-01), Horner
patent: 4207370 (1980-06-01), Lui
patent: 4287486 (1981-09-01), Javan
Sheffield et al., "An Independently Controllable Multiline Laser Resonator and Its Use In Multifrequency Injection Locking", Appl. Phys. Lett., vol. 29, No. 9, Nov. 1, 1976.
Braverman Leonard W.
Gardner Phillip J.
Guch, Jr. Steve
Jones Robert W.
Cannon Russell A.
GTE Government Systems Corporation
Jr. Leon Scott
Lawler John F.
Sikes William L.
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