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전광섬유 MOPA 시스템 기반 10 GHz 선폭을 갖는 1.5 kW 단일모드 이터븀 첨가 편광유지 광섬유 레이저

All-fiber 1.5-kW-class Single-mode Yb-doped Polarization-maintaining Fiber Laser with 10 GHz Linewidth

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초록

본 논문에서는 전광섬유 master oscillator power amplifier (MOPA) 구조의 이터븀(ytterbium) 첨가 편광유지 광섬유 레이저의 유도 브릴루앙 산란 및 모드 불안정 특성에 대해 연구하였다. 이터븀 첨가 광섬유 및 신호 광원의 종류에 따라 레이저 출력 및역반사 스펙트럼을 측정하여 광섬유 레이저의 출력 증폭 한계를 분석하였다. 레이저 구조의 최적화를 통해 단일모드 빔 품질을 갖는 전광섬유 고출력 편광유지 광섬유 레이저를 구현하였다. Pseudo-random binary sequence (PRBS) 신호에 의해 위상변조된 10 GHz의 선폭을 갖는 신호 광원을 적용하여 1.5 kW의 출력을 얻었다. 최대 출력에서 1.15의 빔 품질을 가지며, 17 dB 이상의 편광소광률 특성을 확인하였다.

Abstract

In this paper, we have studied the characteristics of stimulated Brillouin scattering (SBS) and mode instability (MI) in a ytterbium-doped polarization-maintaining fiber laser with master oscillator power amplifier configuration. We measured the laser output power and back-reflection spectrum for a variety of ytterbium-doped fibers and seed lights, to investigate the power-scaling limits of fiber lasers. By optimizing the laser structure, we demonstrated an all-fiber high-power polarization-maintaining fiber laser with near-diffraction-limited beam quality. The output power of 1.5 kW was achieved with a linewidth of 10 GHz, generated by pseudo-random binary sequence (PRBS) phase modulation. The beam quality M 2 was about 1.15 at the maximum output power. The polarization extinction ratio (PER) was greater than 17 dB.

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