1. High-efficiency 50 W burst-mode hundred picosecond green laser
- Author
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Shang Lu, Ce Yang, Meng Chen, Xie Zhang, Xin-Biao Du, and Ning Ma
- Subjects
Nuclear and High Energy Physics ,Materials science ,Picosecond laser ,business.industry ,Green laser ,Second-harmonic generation ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,chemistry.chemical_compound ,Optics ,Nuclear Energy and Engineering ,chemistry ,Picosecond ,0103 physical sciences ,Lithium triborate ,0210 nano-technology ,business ,Burst mode (computing) - Abstract
We report high-energy, high-efficiency second harmonic generation in a near-infrared all-solid-state burst-mode picosecond laser at a repetition rate of 1 kHz with four pulses per burst using a type-I noncritical phase-matching lithium triborate crystal. The pulses in each burst have the same time delay ( ${\sim}1~\text{ns}$ ), the same pulse duration ( ${\sim}100~\text{ps}$ ) and different relative amplitudes that can be adjusted separately. A mode-locked beam from a semiconductor saturable absorber mirror is pulse-stretched, split into seed pulses and injected into a Nd:YAG regenerative amplifier. After the beam is reshaped by aspheric lenses, a two-stage master oscillator power amplifier and 4f imaging systems are applied to obtain a high power of ${\sim}100~\text{W}$ . The 532 nm green laser has a maximum conversion efficiency of 68%, an average power of up to 50 W and a beam quality factor $M^{2}$ of 3.5.
- Published
- 2020