서지주요정보
Nd:YAG 봉의 열광학적 변화를 보정하는 레이저 공진기의 출력 및 횡모드 특성 연구 = Characteristics of the output power and the transverse mode of the laser resonator compensating the thermal lensing effect in a Nd:YAG rod
서명 / 저자 Nd:YAG 봉의 열광학적 변화를 보정하는 레이저 공진기의 출력 및 횡모드 특성 연구 = Characteristics of the output power and the transverse mode of the laser resonator compensating the thermal lensing effect in a Nd:YAG rod / 김광석.
저자명 김광석 ; Kim, Kwang-Suk
발행사항 [대전 : 한국과학기술원, 1992].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8002360

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 92002

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The thermal behavior of a Nd:YAG rod under flashlamp pumping has been investigated experimentally using a simple interferometric technique. The degree of flashlamp pumping uniformity and the heat generation rate inside the rod were measured for the single pulse pumping. The temperature increase at the center of the rod under a high-repetition rate pulsed operation was also measured, and the suface haet transfer coefficient was deduced from it. And parameters of an empirical formula for the thermal focal length of the rod were determined in this experiment. With these results, we have designed and fabricated the optical resonators which could compensate the thermal lensing effect of the rod. In case of a plane-parallel (P-P) resonator, the average output power and the beam divergence of multimode laser were 140 W and 12 mrad, respectively. For a plano-convex (P-C) resonator, the slightly reduced average output power of 110 W was obtained at the same input power as P-P resonator. In order to overcome this lower efficienc y in P-C resonator, a new three mirror resonator (modified plano-convex resonator : M/P-C resonator) was invented. In case of lower input power in this new resonator, the output power of M/P-C resonator was increased by 15% comparing to the P-C resonator and in the higher input power, the output power was almost the same as P-P resonator. The M/P-C resonator output beam has almost the same divergence in sagittal and tangential plane. The misalignment (tilt) effect on the output power was also measured for these three kinds of resonator configurations. In higher input power operation, the rear mirror alignment was found to be not so critical for all kinds of resonators. In case of lower input power, the alignment is more critical for the P-C and the M/P-C resonator than for the P-P resonator. In conclusion, the thermal behavior of a Nd:YAG rod in thermally equilibrium state was investigated using a simple interferometric technique in order to design the more practical laser resonators. A new M/P-C resonator and other conventional resonators (P-P and P-C) were investigated in detail for the output power and the beam divergence viewpoints.

서지기타정보

서지기타정보
청구기호 {DAP 92002
형태사항 iv, 106 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Kwang-Suk Kim
지도교수의 한글표기 : 공홍진
지도교수의 영문표기 : Hong-Jin Kong
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 99-106
주제 Thermal properties.
Lasers --Resonators.
YAG 레이저. --과학기술용어시소러스
레이저 공진기. --과학기술용어시소러스
열 렌즈 효과. --과학기술용어시소러스
Nd-YAG lasers.
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