펌핑 구조에 따른 1 kW급 협대역 편광 유지 광섬유 레이저의 출력 특성 연구
A Study of the Output Characteristics of a 1-kW-class Narrow-bandwidth PM Fiber Laser Depending on Its Pumping Structure
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초록
본 논문에서는 주 증폭기가 양방향 펌핑 방식인 MOPA (master oscillator power amplifier) 협대역 고출력 광섬유 레이저를 제작하였으 며, 제작된 레이저의 출력 특성을 연구하였다. 이터븀이 도핑된 코어 25 μm, 클래드 400 μm 편광 유지 광섬유를 사용하여 주 증폭부를 제작 하였으며, 신호 광원은 PRBS (pseudo-random binary sequence) 신호에 의해 위상 변조된 3 GHz, 10 GHz의 선폭을 갖는 광원을 사용하 였다. 3 GHz의 선폭을 가진 신호 광원을 이용하여 순방향과 역방향 펌프 비율을 조절하며 SBS (stimulated Brillouin scattering) 특성을 분석하였다. 10 GHz의 선폭을 가진 신호 광원을 이용하여 주 증폭기의 펌핑 비율에 따른 TMI 특성을 분석하였다. 순방향 및 역방향 펌프 비율을 1.6:1로 입사시켰을 때 주 증폭기의 출력을 1 kW까지 증폭하였으며, 기울기 효율과 빔 품질(M 2 )은 각각 80%, 1.36으로 측정되었다.
Abstract
This paper presents a study of laser output characteristics. We fabricated a MOPA (master oscillator power amplifier)-type high-power, narrowbandwidth fiber laser with a bidirectional pumping configuration in its main amplifier. As signal beams, light sources with bandwidths of 3 GHz and 10 GHz—phase-modulated through a PRBS (pseudo-random binary sequence)—were used interchangeably. Furthermore, the characteristics of the SBS (stimulated Brillouin scattering) were analyzed using a signal beam with 3 GHz bandwidth, by adjusting the forward to backward pumppower ratio. Moreover, the characteristics of the transverse mode instability were analyzed by adjusting the forward to backward pump-power ratio, using a signal beam with 10-GHz bandwidth. Finally, the output power from 10 GHz bandwidth was amplified to more than 1 kW using a forward to backward pump-power ratio of 1.6. The beam quality M 2 was measured to be approximately 1.36, and the optical-to-optical efficiency was 80% at maximum output power.
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