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Liquid crystal space light modulators and optical correlators in military application

100%

Kłosowicz S. J. , Zieliński J.

tom Vol. 51, nr 1

63-76

The basics of a construction and action of liquid crystal spatial light modulators are described. An application of those systems for optical correlation is presented. The special attention is paid to the application of such devices in image recognition. Possible military applications are described.

Opisano podstawy konstrukcji i działania ciekłokrystalicznych przestrzennych modulatorów światła. Przedstawiono zastosowanie tych układów do korelacji optycznej. Szczególną uwagę poświęcono zastosowaniu tych urządzeń do rozpoznania obrazowego. Opisano możliwe zastosowania w technice wojskowej.

LCoS spatial light modulators as active phase elements of full-field measurement systems and sensors

100%

Kujawinska M. , Porras-Aguilar R. , Zaperty W.

Metrology and Measurement Systems

2012

tom Vol. 19, nr 3

445-458

Spatial light modulators (SLM) are devices used to modulate amplitude, phase or polarization of a light wave in space and time. Current SLMs are based either on MEMS (micro-electro-mechanical system) or LCD (liquid crystal display) technology. Here we report on the parameters, trends in development and applications of phase SLMs based on liquid crystal on silicon (LCoS) technology. LCoS technology was developed for front and rear projection systems competing with AMLCD (active matrix LCD) and DMD (Digital Mirror Device) SLM. The reflective arrangement due to silicon backplane allows to put a high number of pixels in a small panel, keeping the fill-factor ratio high even for micron-sized pixels. For coherent photonics applications the most important type of LCoS SLM is a phase modulator. In the paper at first we describe the typical parameters of this device and the methods for its calibration. Later we present a review of applications of phase LCoS SLMs in imaging, metrology and beam manipulation, developed by the authors as well as known from the literature. These include active and adaptive interferometers, a smart holographic camera and holographic display, microscopy modified in illuminating and imaging paths and active sensors.

Data encryption of optical fibre communication using pseudo-random spatial light modulation

100%

Kowalski M. , Życzkowski M.

Opto-Electronics Review

2016

tom Vol. 24, No. 2

75--81

We propose and study a new technique for securing fibre data communication. The paper presents a method for optical encryption of information transmitted with a traditional fibre link. The encryption method uses a spatial light modulator which converts light pulses representing original data into pseudo-random patterns. A linear combination of light pulses with pseudo-random patterns provides a required encryption performance. The main element of the encryptor is the spatial light modulator which comprises a matrix of cells selectively transmitting or blocking the light beam depending on the pseudo-random configuration of cells. The encrypted information is transmitted through the optical fibre. The decryption process relies on a computational solving of linear program or greedy pursuit. We present a brief description of the method, theoretical analysis and results of numerical simulation. A physical model concept of the method is also presented.