Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2007-10-23
2007-10-23
Alsomiri, Isam (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S028000, C372S026000, C372S029011
Reexamination Certificate
active
11346156
ABSTRACT:
An arrangement for generating a high power optical radar beam. The arrangement includes first and second laser sources each having a first laser for generating an optical beam of a relatively low frequency F1and a second laser for generating an optical beam of relatively higher frequency F2. Each laser source provides a first optical beam of frequency F2and a second optical beam of frequency F1+F2. The arrangement also includes first and second waveform generators each having a modulator and a mixer. A first waveform generator receives the optical beams from the first laser source and a modulation signal for modulating the F1+F2optical beam. The first waveform generator is operative to provide an output optical beam of frequency F1having all of the modulation applied to the optical beam of frequency F1+F2. A phase comparator receives the outputs from the waveform generators and if they deviate in phase, a feedback device applies a corrective signal to the modulator of the second waveform generator until the two output signals are identical. When they are identical, the phase comparator is operable to provide an output optical beam which is the coherent addition of its two input optical beams.
REFERENCES:
patent: 5740190 (1998-04-01), Moulton
patent: 5946130 (1999-08-01), Rice
patent: 5991316 (1999-11-01), Kikuchi
patent: 6115114 (2000-09-01), Berg et al.
patent: 2006/0013270 (2006-01-01), Yumoto et al.
patent: 2006/0139620 (2006-06-01), Hopwood et al.
Fitelson Michael M.
Glezen John H.
Gray George R.
Hopwood Francis W.
Patrick Christopher M.
Alsomiri Isam
Andrews & Kurth LLP
Northrop Grumman Corporation
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