研究目的
To develop a two-stage end-pumped Nd:YVO4 amplifier seeded by a passively Q-switched microchip laser for generating high-repetition-rate and high-beam-quality laser pulses with 1.5 MW peak power.
研究成果
The two-stage Nd:YVO4 MOPA laser system achieved a maximum average power of 13.5 W and pulse energy of 1.93 mJ, with a total gain of 43.5 and extraction efficiency of 16.1%. The beam quality factors were measured to be ?? 2 ?? = 1.56 and ?? 2 ?? = 1.48. The re-imaging system in the double-pass configuration improved beam quality due to gain guiding effect.
研究不足
The theoretical model may not predict accurate results of the power gain and the beam quality when the ratio of seed spot radius to pump spot radius is over 1, due to the complexity of the actual beam profile and thermal effects.
1：Experimental Design and Method Selection:
A two-stage end-pumped Nd:YVO4 amplifier was designed, seeded by a passively Q-switched microchip laser. The amplifier included a single-pass stage and a double-pass stage to achieve high gain and good beam quality.
2：Sample Selection and Data Sources:
A passively Q-switched microchip laser at 1064 nm was used as the seed source. The amplifier stages utilized a-cut
3：3 at.% doped Nd:
YVO4 composite crystals.
4：List of Experimental Equipment and Materials:
Equipment included a microchip laser, isolator, half wave plates, plano-convex lenses, Nd:YVO4 crystals, laser diodes, coupling systems, and a re-imaging system consisting of a convex lens and a plane mirror.
5：Experimental Procedures and Operational Workflow:
The seed laser beam was focused into the Nd:YVO4 crystal, pumped by laser diodes at 878 nm and 808 nm. The re-imaging system in the double-pass stage was optimized for beam quality enhancement.
6：Data Analysis Methods:
Output power, pulse duration, and beam quality factors were measured using a power meter, digital oscilloscope, and beam quality analyzer. Theoretical models were used to estimate gain and beam quality.
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