Passively Q-switching and mode-locking has been realized in a diode-pumped Nd:YAG laser using a GaAs wafer as an output coupler as well as a saturable absorber. The laser has a Z-type cavity to achieve a tight-focused beam at the saturable absorber and to realize an optimum mode matching in the laser crystal simultaneously. At an incident pump power of 13.8 W, the average output power was 1.62 W. The repetition rate and pulse width of the Q-switched pulses are in the range of 29 to approximately 73 kHz and 0.73 to approximately 1.87 microsecond(s) , respectively. The mode-locked pulses were measured to have a repetition rate of 154 MHz and an average pulse duration of 42 ps.
We reported pump uniformity study of a side-pumped DPSS laser, which produced CW output of 30 W with a proper uniform pumping. An JR camera was employed to study the pump energy distribution as well as the thermal effect inside the laser crystal. Theoretically simulated energy distributions were compared with the experimentally measured JR images. Jt is found that the JR imaging technology is an effective method to study pump uniformity of side-pumped DPSS lasers, and uniform pumping is very essential to achieve a good beam quality and a wider stable operating range for high-power DPSS lasers.
We present a general model for design and fabrication of high efficient, high brightness IR and visible microchip lasers closely coupling pumped by a fiber coupled diode laser. The design parameters and the output laser characteristics are simulated for both cw and Q-switch operations, as well as their wavelength conversions.
In this paper, a symmetrical optical resonator that contains the dual-telescopic elements and two rods used for a hybrid diode end-pumped and side-pumped geometry is investigated theoretically to generate high scaling laser output. The dual telescopes within resonators are appropriately chosen and adjusted to achieve a large-volume TEMoo mode and to minimize the effects of the variations of the focal length in the rod. The movement of the optimal operation point of resonator caused by larger change range of pump power will be compensated by adjusting telescope defocusing. The resonator can also be applied for diode-pumped high-average- power solid-state lasers.
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