Nanosecond (ns) pulsed laser with high average power and high pulse repetition rate above 50 kHz is a potential solution for laser cutting, laser welding, laser cleaning and many other industry processing scenarios. Although Nd:YAG is a widely used solid-state gain medium, it is difficult to obtain ns pulsed laser with repetition rate above 50 kHz due to its limited stimulated emission cross section and thermal distortion under high pump intensity. In this paper, a kilowatt-level 100 kHz high repetition rate ns Nd:YAG master oscillator power amplifier (MOPA) laser system is reported, and a general optimization method was used to obtain a 205 W seed laser with a high repetition rate of 100 kHz. After beam shaping elements, the seed laser was amplified to 1008 W by a two-rod Nd:YAG preamplifier and a two-rod Nd:YAG main amplifier. The pulse-to-pulse stability factor of the pulsed laser was 0.961 and the pulse width was measured as 142.8 ns. The beam parameter product in the horizontal axis and vertical axis were measured as BPPx = 2.81 mm∙mrad and BPPy = 2.78 mm∙mrad respectively. This is the first time to obtain a kilowatt-level average power ns pulsed laser with repetition rate above 50 kHz using Nd:YAG, and the compact MOPA system is also suitable for power scaling and other practical use.
A novel insertable monolithic ring laser based on a Nd:YAG-YAG bonded crystal was proposed for high output power single-frequency operation. In a proof-of-principle experiment, the unidirectional resonator pumped by an 808 nm diode laser was constructed with a half-wave plate and a TGG etalon, thus achieving both structural stability and functional tunability. A single-frequency laser with the output power of 4.1 W is obtained at 1064 nm, corresponding to the slope efficiency of 17.7 % and an optical-to-optical efficiency of 11.8 %. The power fluctuation is measured to be within ±1% over 20 min. The average beam quality factor M2 is measured to be 2.07.
We present a compact pulse width stretched nanosecond pulse Nd:YAG green laser based on a multi-pass cavity (MPC). The pulse widths were stretched from adjustable regime 110-260 ns to 460-600 ns by changing from single to multi-pass operation at the pulse repetition rate of 10 kHz. At a typical pulse width of 460 ns, an average output power of 6.5 W was successfully achieved. The 532 nm output power and pulse width versus the 1064 nm pump power were simulated. The calculated results were well consistent with experimental data. Such nanosecond pulse lasers are interesting for both industrial and scientific applications, for example laser damage experiment for some new materials.
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