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A passively Q-switched side-pumped laser with folded resonator is specially constructed for single-longitudinal-mode smooth pulse output. Nd:YAG is chosen as the laser active medium and Cr~(4+):YAGas the saturable absorber medium. Additionally, the method of frequency selection by grating with 1200line/mm and Fabry-Perot (F-P) etalon is used in the twisted-mode cavity. The single-frequency smoothpulses are produced with 10-Hz repetition rate, 20-ns pulse width, and 1.064-μm wavelength. The proba-bility of single-frequency laser output measured is over 99% by using the methods of Fourier analysis andF-P etalon multiple-beam interferometry at the threshold voltage. The measured near-field and far-fieldangles of divergence are 1.442 and 1.315 mrad, respectively. The values of M~2 are 1.32 and 1.31 separatelywith the knife-edge method. Single pulse at 1.064 μm with the energy of 8.8 mJ is achieved in TEM_(00)mode.
A passively Q-switched side-pumped laser with folded resonator is specifically constructed for single-longitudinal-mode smooth pulse output. Nd: YAG is chosen as the laser active medium and Cr ~ (4 +): YAGas the saturable absorber medium , the method of frequency selection by grating with 1200 line / mm and Fabry-Perot (FP) etalon is used in the twisted-mode cavity. The single-frequency smooth pulses are produced with 10-Hz repetition rate, 20-ns pulse width, and The proba- bility of single-frequency laser output measured is over 99% by using the methods of Fourier analysis and F-P etalon multiple-beam interferometry at the threshold voltage. The measured near-field and far-field angles of The values of M ~ 2 are 1.32 and 1.31 both with the knife-edge method. Single pulse at 1.064 μm with the energy of 8.8 mJ is achieved in TEM_ (00) mode.