Abstract
The RTP electro-optical Q-switched ceramic laser at the wavelength of 678nm with narrow pulse width is studied. We used the laser diode arrays side-pumped Nd:YAG ceramic crystal with 1.1at% Nd doping and dimensions of Φ3mm×50mm, designed folding cavity parameters, and discussed the variation of the beam radius in the ceramic crystal and frequency doubling crystal with the thermal focal length of ceramic crystal or KTP crystal. By using double RTP crystals as electro-optic Q-switch and KTP crystal type II phase matching for intracavity frequency-doubling, a narrow pulse width electro-optical Q-switched Nd:YAG ceramic laser was obtained. The output energy of 0.9mJ and the pulse width of 41.6ns at 678nm are obtained at the repetition rate of 1000Hz and pumped power of 144W. The results formed the basis for the further development of the high power and high efficiency ceramic red laser.
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