Liquid Crystal Light Valve Color Projection System
The trend of research and development of liquid crystal light valve color projection system is presented, firstly. Then, the two types of projection systems developed in our laboratory are given. One of the systems is based on a high-brightness, highresolution, electrically addressed, reflectively reading CR.T-LCLV spatial light modulators (SLMs). The other employs three transmitting-readout si-TFTLCLVs. The design features of the two types of the projection systems are demonstrated and the performance of the systems are given. applications. A variety of liquid crystal color projection systems [11--[51 have been produced. In this paper, we demonstrate the main design features of the two 111 color projection systems developed in our laboratory. Firstly, the color projection system is based on three electrically addressed, reflectively readout cathode-ray tube-liquid crystal light valve(CRT-LCLV) made in our laboratory. Secondly, the color projection system employs a long lifetime xenon arc lamp to photoactivate three highbrightness, high-resolution, transmissively readout liquid crystal light valves(LCLVs). The main design features and the performance characteristics are presented.
1280 x 1024 video rate laser-addressed liquid crystal light valve color projection display
An all solid-state 1280 x 1024 laser raster scanner (LRS) system conforming to the EIA RS-343 television standard with a limiting resolution of 1300 TV lines has been developed. The laser scanner incorporates acousto-optic devices to perform video modulation and X-Y deflection and is used in a time-multiplexed mode to photoactivate three liquid crystal light valves to project full-color, video-rate, large-screen images. Analysis ofthe LRS optical system, projection optics, electronics, and light valve characteristics is presented.
Waist location and Rayleigh range for higher-order mode laser beams.
Self has presented simple equations for Gaussian-mode laser beams for calculating focused waist location and beam waist magnification in terms of the Rayleigh range. Since the Rayleigh range is a purely geometrical quantity, Self’s equations can also be applied to higher-order mode beams. A convenient form of the Rayleigh range for Hermite-Gaussian modes is presented along with representative results for CO2 laser industrial processing facilities.