Differential polarization LADAR

Details Differential polarization LADAR Differential polarization LADAR

1992-01-13

1993-12-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, 356 5, 359156, G01N 2186

Patent

active

052723518

ABSTRACT:
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 reduction in eye injury potential and good transmission in the atmosphere while improving scattering performance.

REFERENCES:
patent: 4025194 (1977-05-01), Teppo
patent: 4036557 (1977-07-01), Christensen
patent: 4270862 (1981-06-01), Hewitt
patent: 4333008 (1982-06-01), Misek
patent: 4515471 (1985-05-01), Eden
patent: 4844593 (1989-07-01), Parker et al.
patent: 4902125 (1990-02-01), Keene et al.
patent: 4902127 (1990-02-01), Byer et al.
patent: 4919532 (1990-04-01), Mocker et al.
Kock, W. E., Circular Polarization in Certain Laser and Holography Applications; Applied Optics, Jul. 1975, vol. 14, No. 7, pp. 1471-1472.

Affiliated with

Also associated with

Rating

Differential polarization LADAR does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Differential polarization LADAR, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential polarization LADAR will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-310775