서지주요정보
대기압에서 작동하는 이산화탄소 레이저로 광펌핑되는 암모니아 레이저의 출력 특성 = Output power characteristics of $NH_3$ laser pumped by TEA $CO_2$ laser
서명 / 저자 대기압에서 작동하는 이산화탄소 레이저로 광펌핑되는 암모니아 레이저의 출력 특성 = Output power characteristics of $NH_3$ laser pumped by TEA $CO_2$ laser / 김기호.
저자명 김기호 ; Kim, Gee-Ho
발행사항 [대전 : 한국과학기술원, 1992].
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소장정보

등록번호

8002369

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 92011

SMS전송

도서상태

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반납예정일

초록정보

Dual corona discharge(DCD) transversely excited at atmospheric pressure(TEA) $CO_2$ laser system, consisted of a surface corona discharge(SCD) and a multiple-wire corona discharge(MWCD), is designed and fabricated to overcome a geometrical shortcomming of MWCD TEA $CO_2$ laser. Its output power charateristics and operation stability are markedly improved found by comparing with those of SCD and MWCD system. Amplification of $CO_2$ laser power is carried out for far-infrared laser generation. The optimum time delay between amplifier and oscillator is determined experimentally and compared with that obtained by numerical calculation of 5-coupled rate equations. The maximum amplified output energy is 1.5J using 2-pass,2-stage amplification for 330mJ input laser energy. Kinetics of near-resonant energy transfer in polyatomic mixture are fully elucidated by absorption experiment and theoritical calculation of rate equations. The transmittance of $CO_2$ laser beam to the mixtures which is consisted of $SF_6$ as absorber and $NH_3$,$CH_3F$,$CF_4$,Ar,He, and $N_2$ as buffer gases in measured. Vibrational-vibrational relaxation rate between $SF_6$ and polyatomic buffer gases is determined by theoritical best fitting of experimental results and this results are in good agreement with quantum mechanical collision theory. Multiphoton absorption characteristics of freon gases, such as $CCl_2F_2$,$CHCl_2F_2$,$CBrF_3$,and $C_2Cl_2F_4$, are experimentally observed in high pressure region for $CO_2$ laser lines. $CBrF_3$ is explicitly showing the pressure dependent nonlinear absorption behavior for $Co_2$ laser 9P(10) and 9R(8) line. Self-focusing and defocusing of TEA $CO_2$ laser pulse in $CH_3F$ media are investigated. The nonlinear refractive index coefficients are determined by the far field beam distortion method. Self-focusing of $CO_2$ laser 9P(18) line in $CH_3F$ is newly observed and this result is due to absorption in isotope effect of $C^{13}H_3F$. Superradiant/ASE $NH_3$ laser pumped by TEA $CO_2$ laser is experimented and its dynamical behavior is studied by numerical calculation of rate equations. Output energy of $NH_3$ laser is 20mJ when pumped by $CO_2$ laser 130mJ and efficiency of this case is 16%. The output energy of $NH_3$ laser is improved by using buffer gas of $SF_6$. In this case, enhanced maximum output energy is 35mJ and efficiency is 25%.

서지기타정보

서지기타정보
청구기호 {DAP 92011
형태사항 [iv], 135 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Gee-Ho Kim
지도교수의 한글표기 : 공홍진
공동교수의 한글표기 : 이상수
지도교수의 영문표기 : Hong-Jin Kong
공동교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 133-135
주제 Carbon dioxide lasers.
Optical pumping.
암모니아. --과학기술용어시소러스
탄산 가스 레이저. --과학기술용어시소러스
광 펌핑. --과학기술용어시소러스
Ammonia.
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