Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Thermal Lens Compensation in a Fiber-Coupled Laser-Diode Pumped Ceramic Nd:YAG Laser

광섬유 연결 반도체레이저 여기 세라믹 Nd:YAG 레이저에서 열렌즈 효과의 보상

  • Kim, Duck-Lae (Medical Laser and Device Research Center, Dankook University) ;
  • Kim, Yeong-Sik (Medical Laser and Device Research Center, Dankook University) ;
  • Kim, Byung-Tai (Department of Laser & Optical Information Engineering, Cheongju University)
  • 김덕래 (단국대학교 의학레이저의료기기 연구센터) ;
  • 김영식 (단국대학교 의학레이저의료기기 연구센터) ;
  • 김병태 (청주대학교 레이저광정보공학과)
  • Published : 2007.06.25
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Abstract

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.

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.

Keywords

References

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