Optical delay line to correct phase errors in coherent ladar

Details Optical delay line to correct phase errors in coherent ladar Optical delay line to correct phase errors in coherent ladar

2005-06-06

2008-03-18

Tarcza, Thomas H. (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C356S005150

Reexamination Certificate

active

07345744

ABSTRACT:
A ladar system with phase correction. The novel ladar system includes optics for receiving a first signal that is a reflected version of a transmitted laser signal, an optical delay line for providing a second signal that is a delayed version of the transmitted laser signal, and a mechanism for mixing the first signal with the second signal. The second signal is delayed by a time TDthat reduces a relative time difference between the first and second signals such that phase errors caused by laser transmitter instabilities and nonlinear modulation are less than a predetermined level.

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