Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2007-10-09
2007-10-09
Alsomiri, Isam (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S004010
Reexamination Certificate
active
11056669
ABSTRACT:
Optical techniques are disclosed for improving the range resolution of a radar system. An optical source produces chirped optical pulses whose frequency changes linearly with time, wherein the pulse duration is close to the repetition period (quasi cw radiation). The optical source illuminates the target that scatters a portion of the light back into collecting optics of the ladar's receiver. The delayed back-scattered optical waveform is mixed optically with a reference waveform in a non-linear medium to produce optical radiation at a new frequency. The spectral properties of the non-linearly generated light contains information about the distance to the target. Different approaches that may be chosen for non-linear optical mixing are disclosed including sum and difference frequency generation in non-linear crystals.
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Alsomiri Isam
HRL Laboratories LLC
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