Differential polarization ladar

Details Differential polarization ladar Differential polarization ladar

G - Physics

01

S

G01S 11/12 (2006.01) G01S 7/499 (2006.01)

Patent

CA 2087073

The present invention provides a long range LADAR (Laser Detection and Ranging), that employs in combination a 1.32 micron, Q-switched, diode-pumped Nd:YLF laser whose output beam is linearly polarized. A quarter-wave plate is positioned in front of the laser such that the laser's (e.g. vertical)polarized light is converted to right circular polarization. Reflection from a specular surface returns left circular polarized light. A second quarter-wave plate transforms the left circular polarized light to horizontally polarized light which is then propagated through a beam splitter to two Gallium Arsenide Avalanche Photo- Diode detectors. This invention provides both substantial reduc- tion in eye injury potential and good transmission in the atmo- sphere while improving scattering performance.

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