High brightness narrow-linewidth microsecond pulse green laser by frequency doubling of a master oscillator power amplifier Nd:YAG laser

Qi, Zong; Yang, Bo; Guo, Chuan; Bian, Qi; Chang, Jun; Li, Wenjun; He, Li-Jiao; Di, Peng-cheng; Zuo, Jun-Wei; Shen, Yu; Cui, Dafu; Peng, Qinjun; Xu, Zuyan

doi:10.1016/j.optlastec.2018.04.016

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…In combination with an acousto-optic modulator for pulse shaping of the cw master oscillator output, this enabled the generation of rectangular time-profile pulses with widths on the timescale of the fluorescence lifetime of the amplification medium. The single-frequency output with < 10 kHz linewidth, excellent beam quality in the second harmonic, and stable, high peak powers realized here using a compact 2-stage amplification setup compares favorably to other, previously demonstrated systems [7][8][9][10][11][12][13].…”

Section: Discussionsupporting

confidence: 68%

“…This may enable the amplification of low power tunable lasers in a gain medium like titanium:sapphire, or via optical parametric processes. Compared to existing systems, we combine pulse shaping capabilities [6,7] with pulse durations on the order of 100 microseconds [8][9][10][11][12][13], while avoiding spikes and ensuring a flat rectangular temporal profile. The spatial flat-top beam profile is maintained throughout the laser system using relay lenses (not shown) with the image planes indicated in green.…”

Section: Introductionmentioning

confidence: 99%

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Frequency-doubled Nd:YAG MOPA laser system with programmable rectangular pulses up to 200 microseconds

Beyer,

Roth,

Edwards

et al. 2020

Preprint

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A compact frequency-doubled diode-pumped Nd:YAG master-oscillator poweramplifier laser system with programmable microsecond pulse length has been developed. Analog pulse shaping of the output from a single-frequency cw Nd:YAG oscillator, and subsequent amplification, allowed the generation of rectangular pulses with pulse lengths on the order of the Nd:YAG fluorescence lifetime. Rectangular pulses of 1064 nm light with 520 mJ energy, 2.6 kW peak power, and 200 𝜇s duration, with linewidth below 10 kHz, were obtained at a repetition rate of 2 Hz. Second harmonic generation in a LBO crystal yielded pulses of 262 mJ and 1.3 kW peak power at 532 nm. The peak power can be maintained within 2.9% over the duration of the laser pulse, and long-term intensity stability of 1.1% was observed. The 532 nm beam is roughly Gaussian, with 𝑀 2 = 1.41 during the second harmonic generation. This system has potential as a pump source for titanium:sapphire, dye, or optical parametric amplifiers to generate tunable high-power single-frequency radiation.

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