서지주요정보
연속발진 $CO_2$ 레이저의 small-signal gain coefficient 의 측정과 diffusion cooling 의 효과 = Measurement of the small-signal gain coefficient and the effect of diffusion cooling in cw-$CO_2$ laser
서명 / 저자 연속발진 $CO_2$ 레이저의 small-signal gain coefficient 의 측정과 diffusion cooling 의 효과 = Measurement of the small-signal gain coefficient and the effect of diffusion cooling in cw-$CO_2$ laser / 이후군.
저자명 이후군 ; Lee, Hoo-Koon
발행사항 [서울 : 한국과학기술원, 1984].
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소장정보

등록번호

4102380

소장위치/청구기호

학술문화관(문화관) 보존서고

MAP 8420

SMS전송

도서상태

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반납예정일

초록정보

The small-signal gain coefficient and saturation intensity of cw-$CO_2$ laser are measured by using the relation which the gain coefficient is decreased as the intensity is increased. In the present work the gas pressure of the active medium is low enough, so that line broadening may be approximated as inhomogeneous broadening, and in this case the gain coefficient decreases by saturation factor $(1 + I(\nu)/I_s)^\frac{1}{2}$ and in cw laser oscillation, the saturated gain coefficient is equal to the loss coefficient. We give losses to the reasonator and measure the output powers to obtain the small-signal gain coefficient and the saturation intensity $I_s$. The coupled NaCl plates are set symmetrically as the loss plates in the cavity. As transmittance of p-polarized laser light through the coupled NaCl plates is different according to the angle of incidence, we can give arbitrary losses by varying the angles of incidence. And from the change of output power, we calculate the small-signal gain coefficient and saturation $I_s$. The resonator is consisted of a grating and an output mirror which has 15% transmittance. Gas mixing ratio of $CO_2:N_2$:He=1:1:9, gas pressure =1.5 torr, gas flow rate = 1.2 ℓ/min, discharge current = 10 mA and the temperature of cooling liquid is kept -10℃~0℃. As a result of measurement and subsequent calculations for 12 lines of P-branch and 6-lines of R-branch in the transition from (001) to (100), we obtain the small-signal gain coefficient as 0.09/m - 0.55/m and saturation intensity as 4.0 W/㎠ - 7.0 W/㎠. The wall of discharge tube is cooled by cooling liquid ($H_2O$ + glycerine, volume ratio = 1:1) to -20℃. The number of transition lines, rotational temperature, and power of a particular line are found not significantly varying in temperature range-20℃~+20℃, but the ratio of the peak intensity of R-branch relative to that of P-branch has increased approximately from 0.54 to 0.65.

서지기타정보

서지기타정보
청구기호 {MAP 8420
형태사항 vi, 63 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hoo-Koon Lee
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(석사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 60-61
주제 Diffusion.
Cooling.
탄산 가스 레이저. --과학기술용어시소러스
이득. --과학기술용어시소러스
확산. --과학기술용어시소러스
냉각. --과학기술용어시소러스
Carbon dioxide lasers.
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