This paper presents the results of our research and development efforts to provide the National Oceanic and Atmospheric Administration (NOAA) a holographic spatial filtering technique for measuring atmospheric turbulence (C,), wind speed and wind direction1. The device designed consists of a laser array and holographic filter called the transmitter and a holographic filter and a detector array called the receiver. The heart of this device is the long sought after multiplexed sinusoidal holographic optical element zero mean filter. As presently configured, this device is a line-of-sight holographic scintillometer. The main objective of this development was to fabricate a device that would provide significant improvements to the NOAA Wind Profiler II and other related wind profilers.The holographic wind profiler built by Dove Electronics, Inc. is called HOLODAR', since it is from the holographic scintillometer family of devices that bear the tradename. The HOLODAR system is an optical scintillometry system developed for the measurement of atmospheric turbulence, wind direction and wind velocity. It uses holographic spatial filters to greatly improve the performance and accuracy of atmospheric measurements. Significantly, HOLODAR can measure the effects of aircraft passing near the probe beam of the HOLODARTM system. This device can be used for improvements in radars, optical communications, communications, imaging, coherent laser radar and windshear/vortex detection.

No abstract

No abstract

A theoretical analysis of the light absorption and gain mechanisms in a Cd 3 P 2 Semiconductor Cylinder Fiber is presented. The results of these calculations are in good agreement with previously published experimental data. Cd 3 P 2 has two direct energy gaps, which both influence the gain mechanism. Pump light can be used to reduce the absorption. Stronger pump light that generates more charge carriers will produce net gain (gain above absorption compensation). The fiber exhibits gain over a very wide light wavelength bandwidth.

No abstract