研究目的
Investigating the SBS effect in triple-frequency high-power amplifiers and achieving high output power with good spectral properties and high brightness for applications like second harmonic generation and coherent beam combining.
研究成果
A high-power triple-frequency single-mode linearly polarized fiber amplifier with an all-fiber PM MOPA structure was demonstrated, achieving up to 302 W output power with 83% slope efficiency and scaling the SBS threshold up to 12 dB. This device is suitable for applications like SHG and CBC, and the combined SBS suppression method has potential for higher power outputs in narrow linewidth fiber amplifiers.
研究不足
Power scaling is limited by available pump power. The method requires precise control of phase modulation and strain distribution to effectively suppress SBS.
1：Experimental Design and Method Selection:
A single-mode linearly polarized all-fiber amplifier system is set up to investigate SBS effect in triple-frequency high-power amplifiers. The system includes a master oscillator power amplifier (MOPA) structure with a phase-modulated seed laser and a designed step-distribution strain applied on the active fiber for SBS suppression.
2：Sample Selection and Data Sources:
The seed laser is a single-frequency linearly polarized laser with a wavelength of 1064 nm, phase-modulated to generate a triple-frequency seed.
3：List of Experimental Equipment and Materials:
Includes a LiNbO3 electro-optic phase modulator (EOPM), arbitrary waveform generator (AWG), Yb-doped double-cladding fiber (YDF) pre-amplifier chain, high-power PM isolator, laser diodes (LDs), optical spectrum analyzer (OSA), and Fabry–Perot interferometer (FPI).
4：Experimental Procedures and Operational Workflow:
The seed laser is phase-modulated, amplified, and then combined with pump power in the main amplifier. The output is collimated into free space for analysis.
5：Data Analysis Methods:
The output spectrum and frequency characteristics are analyzed using an OSA and FPI. The SBS suppression effect is evaluated based on the backward power and output power measurements.
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