Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Study of the Variation of Optical Amplification Characteristics with Incident Beam Size and Temperature of a Cesium-vapor-based Optical Amplifier

세슘 원자 증기 기반 광 증폭기의 온도와 빔 크기에 따른 광 증폭 특성 연구

  • Ryu, Siheon (Department of Energy Systems Research, Ajou University) ;
  • Jeong, Yujae (Department of Energy Systems Research, Ajou University) ;
  • Yeom, Dong-Il (Department of Energy Systems Research, Ajou University)
  • 류시헌 (아주대학교 에너지시스템학과) ;
  • 정유재 (아주대학교 에너지시스템학과) ;
  • 염동일 (아주대학교 에너지시스템학과)
  • Received : 2021.10.28
  • Accepted : 2021.11.15
  • Published : 2021.12.25
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Abstract

We study the amplification properties of an optical amplifier based on a cesium-vapor cell. An optical amplification system including cesium vapor mixed with a buffer gas is built, and its amplification feature is investigated as a function of the size of the incident beam and the temperature of the cesium-vapor cell. We observe that the optical amplification properties, such as amplification factor and extraction efficiency, change significantly depending on the temperature and beam diameter of the pump and seed light. A maximum extraction efficiency of 56% is obtained when the temperature of the cesium cell is 90 ℃, with a 200-㎛ diameter of the pump (500 mW) and seed light (10 mW). The numerical simulation of the amplification properties agrees reasonably with the results obtained from the experiment.

버퍼가스와 세슘 증기가 혼합된 광 증폭 시스템을 구성하고 세슘 용기의 온도 및 빔 직경의 변화에 따른 광 증폭 특성을 조사하였다. 광 증폭인자 및 추출 효율 등 광 증폭기 특성이 세슘 용기의 온도 및 빔 직경에 따라 크게 변하는 것을 확인하였는데, 90 ℃의 세슘 용기온도에서 200 ㎛ 직경을 가진 펌프(500 mW) 및 씨앗 광(10 mW)이 입사하였을 때 최대 56%의 광 추출효율을 얻을 수 있었다. 또한, 전산 모사를 통하여 계산한 광 증폭 특성이 실험으로부터 얻은 결과와 합리적으로 일치하는 것을 확인하였다.

Keywords

Acknowledgement

이 연구는 고효율레이저 특화연구실 프로그램의 일환으로 국방과학연구소의 지원으로 수행되었음(No. UD190015ID).

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