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.
The classic Raman coupled equations, which describe the principles of the interaction between the incident and generated laser, have important applications in numerous domains. However, the classic Raman equations ignored the off-axis generated laser energy, which cannot be ignored in certain circumstances. We improved the classic equations by considering the off-axis laser energy of the stimulated Raman scattering. A single-pass multiwavelength potassium gadolinium tungstate crystal Raman generator pumped by a picosecond Nd:YAG laser was realized. On the basis of theoretical calculation and experimental verification, the improved equations produced numerical results for the output spectrum and output laser conversion efficiency that have a better agreement with the experimental results than the classic equations.
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