서지주요정보
유도 Brillouin 산란 위상공액 거울을 이용한 십자형 광차단 증폭제의 특성에 관한 연구 = Characteristics of cross type optical isolator system with a double pass amplifier and two symmetric stimulated Brillouin scattering phase conjugation mirrors
서명 / 저자 유도 Brillouin 산란 위상공액 거울을 이용한 십자형 광차단 증폭제의 특성에 관한 연구 = Characteristics of cross type optical isolator system with a double pass amplifier and two symmetric stimulated Brillouin scattering phase conjugation mirrors / 이성구.
저자명 이성구 ; Lee, Seong-Ku
발행사항 [대전 : 한국과학기술원, 2000].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8011337

소장위치/청구기호

학술문화관(문화관) 보존서고

MPH 00036

휴대폰 전송

도서상태

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초록정보

Investigation on the characteristics of cross type optical isolator system with a double pass amplifier and two symmetric stimulated Brillouin scattering phase conjugation mirrors(SBS PCM) was performed in this study $Nd^{3+}$:YAG was used as gain medium for the double Pass amplifier and FC-75 index matching oil was used as phase conjugation mirror medium. The reflectivity of SBS PCM using FC-75 index matching oil was over 90% in single mode pumping. But the transmittance of SBS PCM using FC-75 index matching oil was 6% in single mode pumping. This energy loss was generated by surface reflection of optical component, especially polarization beam splitter. The reflectivity of SBS PCM in multi mode pumping was 65%. Also, polarization distortion by thermal birefringence was measured in the case of single Pass amplifier and double pass amplifier with SBS PCM using Faraday Rotator and Quarter Wave Plate. Depolarization ratio in single pass amplifier was 4%. But depolarization ratio in double pass amplifier using Faraday Rotator was 0.6%. So, the polarization distortion was considerably compensated using a Faraday Rotator In double pass amplifier. On the contrary, using Quarter Wave Plate, the polarization distortion was not compensated. The leaked back reflection from the post multi-pass amplifier stage can be coupled with an oscillator and cause severe optical damage even if an optical isolator is employed. A new method to cut off the back reflection by using SBS PCM was performed. In this experimental work, the back reflection could be removed completely if the optical path length between the two SBS PCMs was over 6.5 m. The double pass amplifier combined with this isolator had low gain because of low optical pumping energy, break down in SBS PCM and inappropriate delay time. But the leaked back reflection was completely cut off and laser beam quality was improved.

서지기타정보

서지기타정보
청구기호 {MPH 00036
형태사항 iv, 74 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Seong-Ku Lee
지도교수의 한글표기 : 공홍진
지도교수의 영문표기 : Hong-Jin Kong
학위논문 학위논문(석사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 73-74
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