서지주요정보
光펌핑 沃所레이저의 發振器와 增幅器의 出力特性에關한 硏究 = Output characteristics of the oscillator and amplifier of the optically pumped iodine photodissociationlaser
서명 / 저자 光펌핑 沃所레이저의 發振器와 增幅器의 出力特性에關한 硏究 = Output characteristics of the oscillator and amplifier of the optically pumped iodine photodissociationlaser / 황인헌.
저자명 황인헌 ; Hwang, In-Heon
발행사항 [서울 : 한국과학기술원, 1982].
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소장정보

등록번호

4001547

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 8203

SMS전송

도서상태

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반납예정일

초록정보

An optically pumped iodine photodissociation laser has been developed and the gain-switched pulse output has been investigated. The simplified 6-level model of the iodine laser rate equations is found to be sufficient to explain the gain-switched pulse output characteristics of the laser. The efficient flash lamp system is developed for pumping of the laser. The discharge circuit is analyzed numerically and parallel connection of the two flash tube system is employed for the double elliptical flash reflector. Using the iodine laser oscillator designed and prepared, the mode beating phenomena in the output pulse are investigated. The beating pulse is explained by employing an assumption that several adjacent modes are excited in the resonator coherently. The ratio of the coherent modes to the total number of longitudinal modes which are excited in the cavity, is found to be up to 80% when the cavity length is 450 cm. Also the photodissociation rate is measured by using the threshold condition when the i-$C_2F_7I$ is used as active medium. The photodissociation rate is found to be about 15% for 500J electrical energy discharged in the flash lamps. An amplifier which has the same size of the oscillator, is also designed and prepared for the determination of the extraction rate of the amplifier. The measured extraction rate is found to be 67% when the $i-C_3F_7I$ gas fill pressure is 20 torr in the amplifier tube. It is found that as the gas fill pressure increases, the extraction rate decreases. The output power from the oscillator is found to be 1.3 MW for multimode oscillation. When the oscillator is operated on the $TEM_{oo}$ mode, the output pulse energy is 20 mJ. The pulse duration of the primary peak in the gain-switched output is about 150 nsec. As the $TEM_{oo}$ pulse from the oscillator is amplified in the aforementioned laser amplifier the power multiplies 9.5 times, but as the gas fill pressure in the amplifier increases to 120 torr, the amplification factor is 21.5 times. However the calculation shows that the amplification factor can be as high as 43.4 and the amplified output is 5.6 MW.

서지기타정보

서지기타정보
청구기호 {DAP 8203
형태사항 [iv], 146 p. : 삽도, 사진 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : In-Heon Hwang
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 134-144
주제 Optical pumping.
Iodine lasers.
Light amplifiers.
광 펌핑. --과학기술용어시소러스
광 분해 (Photolysis/disintegration) --과학기술용어시소러스
레이저 발진. --과학기술용어시소러스
증폭기. --과학기술용어시소러스
요오드. --과학기술용어시소러스
Photodissociation.
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