세슘 원자 증기 기반 광 증폭기의 온도와 빔 크기에 따른 광 증폭 특성 연구
Study of the Variation of Optical Amplification Characteristics with Incident Beam Size and Temperature of a Cesium-vapor-based Optical Amplifier
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초록
버퍼가스와 세슘 증기가 혼합된 광 증폭 시스템을 구성하고 세슘 용기의 온도 및 빔 직경의 변화에 따른 광 증폭 특성을 조사하였다. 광 증폭 인자 및 추출 효율 등 광 증폭기 특성이 세슘 용기의 온도 및 빔 직경에 따라 크게 변하는 것을 확인하였는데, 90 ℃의 세슘 용기온도에서 200 μm 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.
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 significantlydepending 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-μm diameter of the pump (500 mW) and seed light (10 mW). The numerical simulation of theamplification properties agrees reasonably with the results obtained from the experiment.
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