Parametric dependence of electrical $CO_2$ laser = 탄산 가스 레이저의 파라미트적 연구

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The strong laser action of $CO_2$ occurs in glow discharge of $CO_2-N_2$-He gas mixtures. The laser action is on a number of rotational transitions belonging to the $\Sigma^+_u,\,\Sigma^+_g$ vibrational band of $CO_2$ in the region of 9.4$\mu$ and 10.6$\mu$. We have investigated the physical processes in the $CO_2$ laser system and compared the theoretical results with the performance data of home-made $CO_2$ laser. The depdendence of the small signal gain and the saturation intensity, which are important for calculating the output power of $CO_2$ laser, are calculated following the thermodynamic approach. The basic assumption of the thermodynamic approach is that the molecular vibrations are simple harmonic oscillations and each vibrational mode can be characterized by a kinetic temperature. The various energy transfer processes were integrated to obtain a selfconsistent energy transfer equations. In doing so, energy transfer rates were tabulated and the energy conservation principle was applied. The molecular vibrational temperatures are computed numerically from the energy equations using the steady state condition. Our calculation assumes the total gas pressure at 8 torrs and the mixture ratio of $CO_2$: $N_2$: He=1:1:8 which is near the optimum condition for the maximum power output. The $CO_2$ laser constructed for this experiment uses a conventional water-cooled cylindrical discharge tube, which is placed in a two-mirror optical resonator. The diameter of the curved tube is 2cm and the discharge length is 80cm. Using an optical power meter, the output laser power is measured at different discharge currents and gas pressures.
Advisors
Chung, Kun-Mo정근모
Description
한국과학기술원 : 전기 및 전자공학과,
Publisher
한국과학기술원
Issue Date
1975
Identifier
61852/325007 / 000731049
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기 및 전자공학과, 1975.8, [ [vi], 124 p. ]

URI
http://hdl.handle.net/10203/39401
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=61852&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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