Shared Aperture Diffractive Optical Elements for LIDAR Reception

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: NASA143
Amount: $67,762.00
Phase: Phase I
Program: SBIR
Awards Year: 2001
Solitcitation Year: N/A
Solitcitation Topic Code: N/A
Solitcitation Number: N/A
Small Business Information
Ralcon Dev Lab
8501 S 400 W, Paradise, UT, 84328
Duns: N/A
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Richard Rallison
 Lab director
 (435) 245-4623
 rdr@ralcon.com
Business Contact
 Ruth Rallison
Title: Owners
Phone: (435) 245-0507
Email: rdr@ralcon.com
Research Institution
N/A
Abstract
Conical scanning LIDAR systems and laser ranging systems that measure atmospheric backscatter, clouds, aerosols, winds, trace species, and sub-surface ocean layers require ruggedized construction and easy alignment. We are proposing to reduce the complexity and alignment chores by building five telescope objectives into one large shared aperture using holographic volume multiplexing techniques similar to those used in some holographic data storage systems. The holographic objectives will then be stationary with five simultaneous look angles that may be turned on and off with a smaller coaxial out going beam scanner or a separate laser in each channel. This simple scheme can eliminate all moving parts which simplifies alignment while providing a more rugged and transportable system. The addition of a holographic aberration correction plate is now possible in a static position near the detector. This small HOE gets illuminated by incoming LIDAR signals and outputs a collimated wave which is easily focused by a simple doublet to a near diffraction limited spot. The benefit is that the field of view can be greatly reduced, thereby reducing background noise levels. The additional diffractive surface squares the wavelength dependant filtering function provided by diffractive optics, thereby further reducing out of band noise.

* information listed above is at the time of submission.

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