VARIABLE POLARIZATION LIDAR OPTICS SYSTEM

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$59,663.00
Award Year:
1990
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
13114
Agency Tracking Number:
13114
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
10 Corporate Pl - S Bedford St, Burlington, MA, 01803
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Orr Shepherd
(617) 273-2820
Business Contact:
() -
Research Institution:
n/a
Abstract
IT IS PROPOSED TO ADD AN INNOVATIVE VARIABLE POLARIZATION OPTICAL SYSTEM TO THE AIR FORCE ABLE (ATMOSPHERIC BACKSCATTER EXPERIMENT) LIDAR SYSTEM. THIS CAPABILITY FOR REAL-TIME, RANGE-RESOLVED POLARIZATION ANALYSIS OF ATMOSPHERIC BACKSCATTER WOULD BE UNIQUE TO THE ABLE LIDAR SYSTEM. IT WOULD ENABLE THE AIR FORCE TO ACQUIRE BOTH GROUNDBASED AND BALLOONBORNE POLARIZATION DATA OF GREATER ACCURACY THAN IS CURRENTLY ATTAINABLE. DATA OBTAINED BY EXISTING LIDAR SYSTEMS ARE BASED ON THE ASSUMPTION THAT THE POLARIZATION OF THE BACKSCATTER RADIATION IS UNCHANGED FROM THAT TRANSMITTED. THE PROPOSED SYSTEM WILL TEST THAT ASSUMPTION. IT IS PROPOSED TO STUDY THE FEASIBILITY OF IMPLEMENTING A VARIABLE POLARIZATION SYSTEM WHICH WOULD INCLUDE STATE-OF-THE-ART VARIABLE LIQUID CRYSTAL RETARDERS HAVING HIGH LASER DAMAGE THRESHOLDS. THESE RETARDERS WOULD ALTERNATELY SWITCH THE POLARIZATION OF THE THREE TRANSMITTED LIDAR WAVELENGTHS, 1064, 532, AND 355 NM. SIMILARLY AN ALTERNATELY SWITCHED POLARIZATION ANALYZER WOULD BE INCORPORATED INTO THE LIDAR RECEIVER. AN ADDITIONAL INNOVATIVE FEATURE OF THE SYSTEM WOULD BE THE USE OF A PHOTON-COUNTING AVALANCHE PHOTODIODE DETECTOR AT 1064 NM TO PROVIDE POLARIZATION DATA AT THAT ADDITIONAL WAVELENGTH.

* information listed above is at the time of submission.

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