서지주요정보
광굴절 효과를 지닌 Bi12(Si;Ge)O20단결정에서 실시한 축퇴4광파혼합으로 발생되는 위상공액파의 온도 의존성 = Temperature dependent phase conkugate wave generation by degenerate four wave mixing in photorfractive Bi12(Si;Ge)O20single crystal
서명 / 저자 광굴절 효과를 지닌 Bi12(Si;Ge)O20단결정에서 실시한 축퇴4광파혼합으로 발생되는 위상공액파의 온도 의존성 = Temperature dependent phase conkugate wave generation by degenerate four wave mixing in photorfractive Bi12(Si;Ge)O20single crystal / 조재흥.
저자명 조재흥 ; Jo, Jae-Heung
발행사항 [서울 : 한국과학기술원, 1987].
Online Access 원문보기 원문인쇄

소장정보

등록번호

4104096

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 8707

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The characteristics and the applications of the photorefractive $Bi_12(Si;Ge)O_20$ Single Crystal is investigated both in a transverse electrooptic modulator type specimen and in a longitudinal electrooptic modulator type specimen. An incoherent image is converted to a coherent image in the incoherent-to-coherent image converter system. The image conversion is achieved in the transmission type Pockels Readout Optical Modulator(PROM) system which is the transverse electrooptic modulator type. The system employs $Bi_12SIO_20$ crystal of (001) cut and the thickness of the crystal is 800㎛, and the applied electric field intensity is 4 KV/cm. The real time incoherent-tocoherent image conversion is successfully accomplished proving experimentally the theoretical prediction. The real time holographic image recording in the longitudinal electrooptic modulator is made in photorefractive $Bi_12GeO_20$(BGO) crystal using $Ar^+$ laser (5145 $À$) beam, and both the diffraction efficiency and image recording and erasure times are measured by using He-Ne laser(6328Å). The dimension of BGO crystal is 6.05mm (110) × 1.60mm (001) × 5.65mm (-110) and applied electric field intensity $E_o$ is 0-9.90KV/cm. The diffraction efficiency increase from $2.08×10^{-3}$($E_o = 0$) to $3.85×10^{-2}$ ($E_o = 9.90KV/cm$) as applied electric field intensity is increased, and the image recording time and the image erasure time are dependent on $E_o$ and they are 60msec-90msec for the same applied voltage range. The good quality of the reconstructed image is obtained. Also, phase conjugate wave is generated from a degenerate four wave mixing in photorefractive $Bi_12SiO_20$ (BSO) crystal without applied voltage. Experiments are performed using the linearly polarized $Ar^+$ laser beam (λ = 5145A) and BSO crystal. The size of this crystal is 10mm (110) × 10mm (001) × 3mm (-110). The maximum intensity of the signal beam is obtained at the pump ratio of r = 1 and the intensity ratio of R = 0.4 between forward pump beam and probe beam. And we have observed that the distorted probe beam is corrected by the wavefront restoration property of the phase conjugate wave. In a degenerate four wave mixing system, the phase conjugate signal from a transmission grating recorded in a $Bi_12SiO_20$ crystal is measured at various temperatures and the results are compared with theory. The diffraction efficiency η has a maximum value at a temperature above room temperature. The dynamic range in η vs $I_t$ increases with increasing temperature, where $I_t$ is the total intensity of the laser beam incident on the crystal. The experimental results are interpreted in terms of the temperature dependence of the effective modulation depth of the transmission grating and the diffusion field in the crystal. Further works on those temperature dependences and that property in the Pockels' coefficients should give more accurate understanding of temperature dependent behavior of the diffraction efficiency of $Bi_12SiO_20$ crystal.

서지기타정보

서지기타정보
청구기호 {DAP 8707
형태사항 iv, 110 p. : 삽도, 사진 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Jae-Heung Jo
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 100-107
주제 Optical phase conjugation.
Photorefractive materials.
위상 공역. --과학기술용어시소러스
온도 종속성. --과학기술용어시소러스
광 굴절. --과학기술용어시소러스
Temperature.
QR CODE qr code