influence of pump pulse duration on the output performance of a led-pumped nd:yag laser

In this paper, we performed an experimental study of a led-pumped nd:yag laser that works in qcw and qswitch modes. we examined how the pump pulse duration affects the laser output. the laser rod was a nd:yag crystal with a diameter of 7 mm and a length of 95 mm, side-pumped by 30 led arrays, each with 18 single dies at 810 nm. the maximum output energy at 1064 nm was 10.5 mj in the qcw mode, with a pump energy of 81 mj (230 μs pulses at 1 hz). the optical conversion efficiency and the slope efficiency were 12.5% and 18%, respectively. in the pqs mode, the output energy was 250 μj, with a pulse width of 190 ns (fwhm), corresponding to a peak power of 1.31 kw. the beam divergence was 0.3 mrad with tem00 mode. this led-pumped q-switched nd:yag laser can be used for laser range finder applications.