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광섬유 연결 반도체레이저 여기 세라믹 Nd:YAG 레이저에서 열렌즈 효과의 보상
김덕래,김영식,김병태,Kim, Duck-Lae,Kim, Yeong-Sik,Kim, Byung-Tai 한국광학회 2007 한국광학회지 Vol.18 No.3
광섬유 연결 반도체레이저 여기 세라믹 Nd:YAG 레이저의 열렌즈를 보상하기 위한 공진기를 구성하였다. 초점거리 30 mm, 유효직경 22 mm인 보상렌즈를 레이저 매질의 단면으로부터 25 mm 떨어진 곳에 위치시켜 열렌즈 효과를 보상하였다. 보상렌즈가 없는 경우 레이저 출력은 열렌즈 효과에 의해 여기파워 6 W 이상에서 급격히 감소하기 시작하였으며, 12 W에 이르러서는 레이저가 거의 발진되지 않았다. 열렌즈 효과가 보상되었을 경우 레이저 출력은 선형적으로 증가하였으며, 여기파워 12 W에서 $M^{2}$값은 2.4로 좋은 빔질을 나타내었다. A fiber-coupled laser-diode pumped ceramic Nd:YAG laser for compensating the thermal tensing effect was developed. The thermal tensing effect was compensated using a convex lens, which was 25 mm away from the laser rod, with a focal length of 30 mm and an effective clear aperture of 22 mm. Without a compensator, the laser output power decreased suddenly above a pump power of 6 W. Using a compensator, the laser output power increased linearly according to the pump power. The beam propagation factor $M^{2}$ was 2.4 under a pump power of 12 W.
김덕래,김병태 대한전기학회 2005 전기학회논문지C Vol.54 No.9(C)
The optical current transformer was developed for 170 kV GIS using optical fiber. The sensor optimized on the optical CT was wound 3 turns and twisted 4 times per a turn at the pipe with a diameter of 130 mm. To optimize the optical CT, the output signal was measured according to the setting angle of polarizer and analyzer. The asymmetry and distortion of the output signals were improved when the parallel polarized light was incident to the fiber sensor and under the angle of analyzer was 45°. The measurement error for the linearity was only ±0.42 % to 1,000 A in the case of reflection type.
반도체레이저 단면여기 세라믹 Nd:YAG 레이저에서 열렌즈 효과 보상 공진기의 설계
김덕래,김병태 한국물리학회 2009 새물리 Vol.58 No.3
Laser resonators for thermal lens compensation in a laser-diode end-pumped Nd:YAG ceramic laser were investigated. The effect of thermal lens compensation was calculated using an output coupler with a 155 mm radius of curvature. The laser output power increased linearly with increasing pump power to the output coupler. The output power and the output efficiency were 3.6 W and 30% respectively, under a pump power of 12 W. 반도체레이저 단면여기 세라믹 Nd:YAG 레이저의 열렌즈 보상 공진기를 설계 및 분석하였다. 열렌즈 효과는 레이저 매질의 단면 또는 출력 거울이 곡률을 갖거나, 공진기 내에 렌즈를 삽입하였을 때 보상이 되는 것으로 계산되었다. 곡률 반경이 155 mm인 출력 거울을 사용하였을 경우 레이저 출력은 선형적으로 증가하였으며, 여기 파워 12 W에서 3.6 W의 출력과 30%의 출력 효율을 나타내었다.
김덕래,김태연,정전은 고려대학교 의과대학 1991 고려대 의대 잡지 Vol.28 No.1
The mechanism of tendon healing has been a controversial issue. Although there seems to be a dipolarizing opinion regarding the tendon heating, it is well known to us that the tendon has both intrinsic and extrinsic healing capacity which has been proved in vivo and in vitro studies. Tendon adhesion is a common sequella after tendon repair, particularly after the long period of immobilization. This can be explained by one wound concept or extrinsic tendon healing. If we can modify the natural healing process of the tendon by augmenting the intrinsic capacity, we can reduce the period of immobilization to allow early motion for better gliding. In this study, we used the electrical stimulation technique, which has been known to have good growth stimulatory effect on the living cells, to investigate its effect on tendon healing in organic culture for 6 weeks. Total 64 flexor tendons were harvested from 8 rabbit paws and they were cultured in separate petri-dishes : 32 tendons were used for the control group and the rest 32 were used for the electric stimulation group. Tendons through which a continuous 7 μAmp current was passed at the repair site were compared with the non stimulated controls. In reference to the histologic study with Hematoxylin & Eosin stain and van Gieson stain, the following results were obtained. 1. There was found no necrosis in the specimens of the control as well as the elctrical stimulation group during 6 weeks' culture period. 2. Starting from 1 week, there was prominent increase of fibroblastic proliferation and collagen production in electrical stimulation group and these active repair processes persisted up to 6 weeks. Accordingly, I conclude that the intrinsic tendon healing capacity can be enhanced by the electrical stimulation in vitro.
김덕래,김병태 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.2
The characteristics of a laser beam produced by using thermal lensing effect compensation in a fiber-coupled laser-diode Nd:YAG ceramic laser were investigated. The thermal lensing effect was compensated for by using a compensator, which was 25 mm away from the laser rod, with a focal length of 30 mm and an effective clear aperture of 22 mm. Using a compensator, the divergence and the beam propagation factor M2 of the output beam were 5.5 mrad and 2.4, respectively, under a pump power of 12W. The high-frequency components in the compensated laser beam were removed.