USA As Represented by Secretary of the Navy

David F Hudson

Robert E Jehle

Laser emissions are stabilized at a plurality of frequencies by passage tugh an absorbing medium pumped by light, merged therewith, to an excited energy state corresponding to pumping light frequencies. Error signals are generated in response to detection of intensity of radiation exiting the absorbing medium which deviates from that of the laser emissions at the stabilizing frequencies to correctively adjust resonant cavity length of the laser generator being frequency stabilized.

Tunable laser frequency stabilizing system

Radiant energy intermittently emitted from a transmitter is reflected as o pulses from a moving target being interrogated to produce Doppler signals by counting of photons of the echo pulses during time domain intervals between emission from the transmitter. Such counting of photons is limited to the time domain intervals by operational control of a laser pump through which a reference beam is generated at an energy level activating detectors irradiated by such beam to count the photons absorbed therein after capture of the photons by a receiving antenna.

Target motion detecting impulse doppler radar system

Pulses of short duration are radiated by an impulse radar transmitter wit time domain intervals under control of a clock to monitor a moving target from which echo pulses are reflected. The echo pulses received are measured by a quantum detector in terms of photon energy levels to supply signal data processed during periods between said time domain intervals.

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Clarksburg, MD, United States of America

David F Hudson