Teruo Ebihara

Characteristics of a ferroelectric liquid crystal spatial light modulator with a dielectric mirror

The continuous gray scale operating characteristics of a ferroelectric liquid crystal spatial light modulator (FLC-SLM) are described. Then an FLC-SLM having a dielectric mirror between an a-Si:H photoconductor and an FLC light modulatory material is presented, and its operating characteristics are reported. The FLC-SLM having a dielectric mirror allows for continuous gray scale applications. It exhibits a resolution of 80 to 100 lp/mm and a higher optical gain than the device without a dielectric mirror.

Optical pattern recognition with LAPS-SLM (I): light-addressed photoconductor and smectic C* liquid-crystal spatial light modulator

Using a hydrogenated amorphous silicon as a photoconductor, the relatively new class of a light addressed photoconductor and SmC* liquid crystal spatial light modulator named LAPS-SLM is presented. The operation and characteristics of LAPS-SLM without using a dielectric mirror is reported.

Ferroelectric liquid crystal spatial light modulator using a hydrogenated amorphous silicon as a photoconductor

Abstract A novel high speed, high contrast, high resolution ferroelectric liquid crystal spatial light modulator using hydrogenated amorphous silicon as a photoconductor (a-Si:H - FLC - SLM) is presented. This device is optically addressed and has good bistability. (1) Response time : Typical values are 500 and 250μsec for rise and decay time, respectively. (2) Contrast ratio : Typically 100 : 1 to 150 : 1, best result 200:1. (3) Resolution : 60∼80LP/mm observed from the USAF resolution test target. Interference fringes with a resolution of more than 120LP/mm are obtained by He-Ne laser.

Threshold characteristics of an OASLM using a a-Si:H photoconductor and a SSFLC modulator

We present the write light intensity threshold characteristics of an OASLM incorporating a hydrogenated amorphous silicon photoconductor and a surface stabilized ferroelectric liquid crystal modulator, LAPS-SLM. In this paper, we describe a new implementation which applying the two threshold characteristics of the LAPS-SLM to perform all Boolean logic by one device.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.