Oscillators – Molecular or particle resonant type
Patent
1976-04-15
1978-05-09
Sikes, William L.
Oscillators
Molecular or particle resonant type
H01S 310
Patent
active
040889645
ABSTRACT:
An image amplifying multi-mode laser with image forming elements in the cavity and with a saturable absorber film at the focal plane in the cavity. Radiation from each point of an image is focused on the saturable absorber film so as to enter a distinct mode of the multi-mode laser. Pump power and saturable absorber film density are jointly adjusted so that a mode of the laser oscillates if and only if the intensity of the radiation from the corresponding image point exceeds a given threshold value. The energy emitted from the bistable laser oscillations constitutes the output. The multi-mode threshold laser is useful for image contrast enhancement, applying a threshold operation in optical information processing, selection of the maximum point of optical matched filter output images and as a naturally formed collection of optical logic elements. Embodiments are disclosed in retro-reflector cavities having both traveling and standing wave modes.
REFERENCES:
patent: 3292103 (1966-12-01), Soules et al.
patent: 3316501 (1967-04-01), Collins et al.
patent: 3639854 (1972-02-01), Baldwin
patent: 3774121 (1973-11-01), Ashkin et al.
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