28 February 2006 Acousto-optically Q-switched and mode-locked diode-pumped Nd:YVO4 laser
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Abstract
The compact picosecond, high power lasers are demanded in several areas e.g. micromachining, ophthalmology etc. One of the promising methods enabling generation of picosecond pulses trains with energies of a few μJ each in a simple resonator is the simultaneous Q-Switching and Mode Locking (QML) regime. We have demonstrated the efficient QML regime applying acousto-optic modulator in double role as an active Q-switch and mode locker. The pumping beam, emitted by 20-W laser diode bar with beam shaper forms the caustics of 0.8-mm width inside the 0.3 at.% Nd3+ doped 10-mm-long YVO4 crystal located in the close vicinity to the rear flat mirror of first arm of Z-type resonator. The acousto-optic Q-switch with 40.7 MHz radio-frequency was located near flat output coupler. The two folding mirrors were mounted on the translation stages to enable matching the resonance frequency of the cavity to the modulation frequency of acousto-optic cell. Due to weak prelassing at 40.7 MHz frequency, the Q-switched pulse train has started to build up from ordered mode locked radiation. The QML pulses with envelope durations of 100-150 ns and near 100% modulation depth were observed for wide range of pump powers and repetition rates. Above 3 W of output average power, 0.130 mJ of the envelope energy having approximately 5-8 mode locked pulses were achieved. The maximum energy of mode locked pulse was about 0.03 mJ with pulse durations much less than 1 ns.
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Jan K. Jabczyński, Waldemar Zendzian, Jacek Kwiatkowski, Krzysztof Kopczyński, "Acousto-optically Q-switched and mode-locked diode-pumped Nd:YVO4 laser", Proc. SPIE 6100, Solid State Lasers XV: Technology and Devices, 61000P (28 February 2006); doi: 10.1117/12.660729; https://doi.org/10.1117/12.660729
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