전자공학회논문지D (Journal of the Korean Institute of Telematics and Electronics D)
- 제36D권9호
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- Pages.56-63
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- 1999
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- 1226-5845(pISSN)
혼합 편광빔과 원주면렌즈를 사용한 SPPCM의 성능 개선
Improvement of the performance of SPPCM using mixed polarized beam and cylindrical lens
- 이은형 (慶北大學校 電子電氣工學部) ;
- 김성완 (慶北大學校 電子電氣工學部) ;
-
김철수
(慶州大學校 情報通信工學部) ;
- 김종윤 (慶北大學校 電子電氣工學部) ;
- 이승희 (大慶大學 情報通信科) ;
- 이수중 (慶北大學校 電子電氣工學部)
- Yi, Eun-Hyeong (School of Electronics & Electrical Eng., Kyungpook National University) ;
- Kim, Seong-Wan (School of Electronics & Electrical Eng., Kyungpook National University) ;
-
Kim, Cheol-Su
(Dept. of Electronics Information & Communication Sciences, Kyongju University) ;
- Kim, Jong-Yun (School of Electronics & Electrical Eng., Kyungpook National University) ;
- Lee, Seung-Hee (Dept. of Information Communication, Taekyung C&D College) ;
- Lee, Soo-Joong (School of Electronics & Electrical Eng., Kyungpook National University)
- 발행 : 1999.09.01
초록
Cat형 SPPCM(selfpumped phase conjugate mirror)의 응답시간을 개선시키기 위한 기존의 방법은 원주면 렌즈를 사용하여 패팅 (fanning) 빔을 증가시키는 방법이었다. 그러나, 이 경우에 SPPCM의 특성들을 개선시키기 위해서는 패닝빔을 제어해 주어야 한다. 본 논문에서는 원주면 렌즈를 사용하여 입력빔을 선형으로 광굴절 결정에 접속시켜 SPPCM의 반사율을 증가시키고 응답시간을 감소시키며, 순수한 이상 편광빔 대신 혼합 편광빔을 입사시킴으로써 출력빔의 시간 불안정도를 감소시키는 방법을 제안하였다. 광실험을 통하여 제안한 SPPCM의 반사율이 2배로 증가하고 응답시간은 1/15로 감소함을 확인하였다. 또한, 혼합 편광빔의 편광 각을
Conventional method to improve the response time of the Cat-SPPCM was to increase fanning beam using cylindrical lens. But, in this case the temporal instability of this SPPCM is increased, and fanning beam plays a role as noise, so that it decreases the reflectivity. Thus, fanning beam must be controlled to improve the properties of SPPCM. In this paper, we propose the method to increase the reflectivity of SPPCM and decrease the response time by focusing line-shaped input beam into photorefractive crystal using cylindrical lens and decrease the temporal instability of output beam by using mixed-polarized beam instead of simple extraordinary polarized beam. Optical experiments show that the reflectivity of proposed SPPCM is increased twice and the response time is reduced by 15 times. Also, we observed that the temporal instability of SPPCM is reduced when the polarization angle of the mixed-polarized beam is between