Oscillators – Molecular or particle resonant type
Patent
1978-05-31
1981-02-03
Sikes, William L.
Oscillators
Molecular or particle resonant type
331 945D, H01S 3081
Patent
active
042491401
ABSTRACT:
A resonator feedback system is disclosed wherein the output from a resonator having adaptive optics is monitored by a detector within a feedback loop to provide electrical control signals to actuators attached to the adaptive optics to control the phase of the radiation within the resonator to produce an output beam having a near diffraction limited distribution. In one embodiment, a portion of the output beam is phase modulated at discrete frequencies and focused through an aperture onto a detector. Far field amplitude fluctuations at the focal point resulting from phase perturbations of the radiation within the resonator produces an amplitude varying electrical input signal which is synchronously detected with multidither signals utilized to impress the phase modulation to produce multicorrection signals. Actuators attached to the adaptive optics of the resonator are responsive to the multicorrection signals to provide phase corrections to the radiation within the resonator to produce an output beam having a near diffraction limited distribution. In a further embodiment, the radiation within the resonator is phase modulated and phase corrected to produce an output beam having a near diffraction limited distribution. In a further embodiment, radiation reflected from a remote target is monitored in accordance with the present invention to provide phase corrections to the radiation within the resonator to compensate for phase distortion in the output beam resulting from changes in the index of refraction of the atmosphere in the path of the output beam resulting from thermal blooming or the like.
REFERENCES:
patent: 3969687 (1979-07-01), Freiberg et al.
Cavanaugh Lawrence A.
Scott Leon
Sikes William L.
United Technologies Corporation
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