Prototype holographic atmospheric scanner for environmental remote sensing

A ground-based atmospheric lidar system that utilizes a holographic optical telescope and scanner has been developed and successfully operated to obta in atmospheric backscatter profiles. The Prototype Holographic Atmospheric Scanner for Environmental Remote Sensing is built around a volume phase ref lection holographic optical element (HOE). This single optical element both directs and collimates the outgoing laser beam as well as collects, focuse s, and filters the atmospheric laser backscatter while offering significant weight savings over existing telescope mirror technology. Conical scanning is accomplished as the HOE rotates on a turntable sweeping the 1.2 mrad fi eld of view around a 42 degrees cone. During this technology demonstration, atmospheric aerosol and cloud return signals have been received in both st ationary and scanning modes. The success of this program has led to the fur ther development of this technology for integration into airborne and event ually satellite Earth-observing scanning lidar telescopes.