• 제목/요약/키워드: spatial light modulator

검색결과 118건 처리시간 0.032초

Bragg type 음향광변조기를 채택한 Electro-holographic system에서의 computer generated Fresnel hologram의 구현 (The CGH in the Electro-holographic system using the Bragg type AOSLM)

  • 최현희;김성규;손정영;우정원
    • 한국광학회:학술대회논문집
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    • 한국광학회 2002년도 하계학술발표회
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    • pp.142-143
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    • 2002
  • KIST에서는 Pulsed Laser를 사용하여 3차원 image를 재생할 수 있는 Electro-Holographic System을 만들어 CGH이미지를 구현하였다. CGH 이미지를 구현하기 위한 SLM (Spatial Light Modulator)으로 TeO$_2$ 결정의 Shear Mode 에서 동작하는 Bragg type의 다채널 AOSLM(Acousto-optic Spatial Light Modulator)이 사용되었다. 이 Bragg type 다채널 AOSLM에서는 광원이 특정 Bragg 각도로 입사하였을 때 다른 고위 차수는 억압되고 +나 -의 첫번째 차수의 회절 빔만이 형성된다. (중략)

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Implementation of Spatial Light Modulator(SLM) using a Commercial LCD Beam Projector

  • Ko, Jung-Hwan;Lee, Jae-Soo
    • 조명전기설비학회논문지
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    • 제20권9호
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    • pp.1-10
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    • 2006
  • In this paper, a new high resolution XGA-SLM is implemented through modification of a commercial TFT-LCD beam projector and its optical modulation characteristics as a spatial light modulator(SLM) is also analyzed. First, the optics module, projection lamp and fans are removed from a commercial beam projector and instead some electric circuits to compensate their removal are manufactured and then, by inserting them into the beam projector, a new XGA-SLM is finally implemented. Second, from some optical experimental results, this TFT-SLM is found to have a good optical linearity in amplitude and phase modulation characteristics as a function of the input gray levels. Especially, through implementation of a binary phase-type correlator such as BPEJTC by using the suggested TFT-LCD panel, the implemented SLM is proposed as a new relatively low-cost and high resolution SLM for optical information processing.

공간광변조기용 LCTV의 성능측정 및 개선 (Performance Evaluation and Modification of LCTV for Spatial Light Modulator)

  • 권원현;김남;반재경;박한규
    • 한국통신학회논문지
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    • 제14권4호
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    • pp.405-411
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    • 1989
  • LCTV를 이차원 공간 광변조기로 사용하기 위하여 성능평가 및 특성개선을 수행하였다. LCTV 스크린의 위상 왜곡은 홀로그램 기판과 굴절을 정합액을 사용해 보정하였고, 실제 사용시 문제시되는 전국 격자패턴의 제거를 위해 BaTiO3 결정에서의 위상공액파를 이용하는 새로운 방법을 제안하고 실험하였다.

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1차원 광변조기의 홀로그래픽 메모리용 서보 시스템 설계 (Concept Design of Servo System for the Holographic Memory of One Dimensional Spatial Light Modulator)

  • 김영주;정석호;이종서;윤상경
    • 정보저장시스템학회논문집
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    • 제2권4호
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    • pp.214-218
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    • 2006
  • The focus and tracking servo system has been designed and proposed for the holographic memory of one dimensional spatial light modulator(SLM). The general servo method of conventional ODD system was based and modified for new holographic memory. The pre-grooved disc pattern and special dichroic coating were also included for new design in this research and the final separated optics are expected to be applied to the future general holographic memory as well as the one dimensional SLM holographic memory.

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An optical micro-magnetic device: magnetic-spatial light modulator

  • Inoue, Mitsuteru;Cho, J.K.;Park, J.H.;Uchida, H.;Nishimura, K.
    • 한국자기학회:학술대회 개요집
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    • 한국자기학회 2002년도 동계연구발표회 논문개요집
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    • pp.13-13
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    • 2002
  • A Spatial light modulator (SLM) is a real-time programmable device having the modulation function of the amplitude, phase or polarization of an optical wavefront as a function of position via electrical or optical control signals. Various types of reusable SLMs with two-dimensional pixel arrays are centrally important devices in volumetric recording, data processing, pattern recognition, optical computer and other optical system. (omitted)

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1차원 자성 포토닉 결정을 이용한 자기 광학 공간 광 변조기의 제조 (Fabrication of Magneto-Optic Spatial Light Modulator based on 1D Magnetophotonic Crystal (MPC-MOSLM))

  • 박재혁;조재경
    • 한국광학회:학술대회논문집
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    • 한국광학회 2000년도 하계학술발표회
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    • pp.192-193
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    • 2000
  • 공간 광변조기(spatial light modulator)는 빛의 진폭, 위상 혹은 편광 상태를 공간적으로 변조하는 소자이다. 2차원적인 화소 배열을 갖는 공간 광 변조기는, 전자 소자들이 지니지 않는, 정보를 고속으로 병렬 처리할 수 있는 기능에 힘입어, 광상관기, 광컴퓨터, 프로젝션 TV, 빔 프로젝트, 홀로그래피 메모리의 핵심 소자로 지난 50년간 활발히 연구되어, 액정 공간 광 변조기, 자기 광학 공간 광 변조기$^{(1)(2)}$ 등이 개발되었다. 이 중에서 자기광학 공간 괌 변조기는 화소의 스위칭 스피드가 빠르고, 견고하고, 내방사능성을 가질 뿐만 아니라, 비휘발성이라는 장점을 가지고 있어, 주로 우주항공용의 Miniature Ruggedized Optical Correlator(MROC)$^{(3)}$ 에 사용되어 왔다. 본 논문에서는 새로운 개념의 공간 광 변조기인 자성 포토닉 결정을 이용한 자기 광학 공간 광 변조기(MPC-MOSLM)의 제조에 관하여 논하고자 한다 (중략)

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FLC SLM을 이용한 편광의존형 2×2 광스위치 (Polarization dependent 2×2 optical switch using ferroelectric liquid crystal (FLC) Spatial Light Modulator(SLM))

  • 김인태;유연석
    • 한국광학회지
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    • 제13권5호
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    • pp.408-413
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    • 2002
  • We demonstrated a polarization dependent type 2$\times$2 optical switch, using a binary reflection type SLM. Reflection type FLC was used as a half wave retardation plate. Two inputs were controlled by each SLM for the desired output direction. In conclusion, in the "1" state the average optical loss was 6.6 ㏈, and in the "0" state the average optical loss was 14.6 ㏈, and measured the switching speed as 75 $mutextrm{s}$. By using this method, a polarization dependent type 2$\times$2 optical switch can be demonstrated and the possibility of a 4-port WDM optical switch also verified.

Polarimetric Measurement of Jones Matrix of a Twisted Nematic Liquid Crystal Spatial Light Modulator

  • Khos-Ochir, Tsogvoo;Munkhbaatar, Purevdorj;Yang, Byung Kwan;Kim, Hyun Woo;Kim, Jin Seung;Kim, Myung-Whun
    • Journal of the Optical Society of Korea
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    • 제16권4호
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    • pp.443-448
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    • 2012
  • A polarimetric experimental method was developed to determine the Jones matrix elements of transparent optical materials without sign ambiguity. A set of polarization dependent transmittance data of the samples was measured with polarizer - sample - analyzer system and another set of data was measured with polarizer - sample - quarter-wave plate - analyzer. Two data sets were compared and mathematically analyzed to obtain the correct signs of the elements of the matrix. The Jones matrix elements of a quarter-wave plate were determined to check the validity of the method. The experimentally obtained matrix elements of the quarter-wave plate were consistent with the theoretical expectations. The same method was applied to obtain the Jones matrix elements of a twisted nematic liquid crystal panel.