Simple method of formation of switchable liquid crystal gratings by introducing periodic photoalignment pattern into liquid crystal cell

2006 ◽  
Vol 266 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Valeri Kapoustine ◽  
Anna Kazakevitch ◽  
Vincent So ◽  
Robin Tam
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Cell ◽  
Simple Method ◽  
Crystal Cell

scholarly journals Fast Method for Liquid Crystal Cell Spatial Variations Estimation Based on Modeling the Spectral Transmission

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3874 ◽  
Author(s):  
Shauli Shmilovich ◽  
Liat Revah ◽  
Yaniv Oiknine ◽  
Isaac August ◽  
Ibrahim Abdulhalim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Cell ◽  
Spatial Variations ◽  
Crystal Phase ◽  
Fast Method ◽  
Spectral Transmission ◽  
Liquid Crystal Phase ◽  
Simple Method ◽  
Crystal Cell ◽  
Phase Retarders

Liquid crystal phase retarders are utilized by photonic devices and imaging systems for various applications, such as tunable filtering, light modulation, polarimetric imaging, remote sensing and quality inspection. Due to technical difficulties in the manufacturing process, these phase retarders may suffer from spatial non-uniformities, which degrade the performance of the systems. These non-uniformities can be characterized by measuring the spectral transmission at each voltage and each point on the liquid crystal cell, which is time consuming. In this work, we present a new fast and simple method for measuring and computationally estimating the spatial variations of a liquid crystal phase retarder with planar alignment. The method is based on measuring the spectral transmission of the phase retarder at several spatial locations and estimating it at others. The experimental results show that the method provides an accurate spatial description of the phase retarder and can be employed for calibrating relevant systems.

Dichroic Azo Dyes for Guest-Host Liquid-Crystal Cell

1982 ◽  
Vol 21 (Part 1, No. 1) ◽  
pp. 191-192 ◽  
Author(s):  
Hidehiro Seki ◽  
Chiyoko Shishido ◽  
Shigeo Yasui ◽  
Tatsuo Uchida
Keyword(s):  
Liquid Crystal ◽  
Azo Dyes ◽  
Liquid Crystal Cell ◽  
Crystal Cell

Liquid crystal cell for space-borne laser rangefinder to space mission applications

2012 ◽  
Vol 20 (4) ◽  
Author(s):  
E. Nowinowski-Kruszelnicki ◽  
L. Jaroszewicz ◽  
Z. Raszewski ◽  
L. Soms ◽  
W. Piecek ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polarization Plane ◽  
Space Mission ◽  
Liquid Crystal Cell ◽  
Laser Rangefinder ◽  
Aperture Diameter ◽  
Crystal Cell ◽  
University Of Technology ◽  
Twisted Nematic ◽  
Space Requirements

AbstractLiquid crystal cell (LCC) for space-borne laser rangefinder to space mission applications was developed, manufactured and tested under cooperation between Military University of Technology (MUT) in Poland and Vavilov State Optical Institute (Vavilov SOI) in Russia. LCC operates in twisted nematic mode, commutating the polarization plane of a laser beam working at 1.064 μm and the energy density not smaller than 0,15 J/cm2 at the pulse duration about 8 ns. The transmission of LCC is not smaller than 95% at the aperture diameter not less than 15 mm. Switching on and switching off times in a 2.5-μm thick LCC driven by voltage of 10 V are not larger than 0.7 ms and 7 ms, respectively, in the operating temperature range from 20°C to 40°C. The LCCs developed in MUT were positively tested under space requirements in Vavilov SOI.

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