High-Frequency Hybrid Burst-Mode Nd:YAG Laser System With Enhanced Gaussian Profile

This study presents a combined theoretical and experimental exploration of a hybrid fiber-bulk master oscillator power amplifier (MOPA) laser operating in burst mode at a 10 kHz pulse repetition rate. By implementing an optimized pumping scheme, Gaussian-like gain profiles were achieved, ensuring uniform spatial beam characteristics throughout the MOPA amplification process. Full-energy beam quality assessment along orthogonal axes yielded measured values of M_x² = 2.8 and M_y² = 3.3, confirming favorable beam spatial characteristics. Additionally, temporal modulation of the burst envelope stabilized the pulse train output. The system demonstrated significant energy scaling, with the amplified pulse energy increasing from an initial 37.82 mJ to a maximum of 72.13 mJ, following a clear dependence on input pulse durations ranging in 20 ~ 80 ns.