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Showing 2 results for Nd:yag Laser

M. Dezhkam, M. Soltanolkotabi,
Volume 3, Issue 1 (3-2009)
Abstract

This paper describes the passive Qswitch, based on polymer and organic dye BDN, of a pulsed Nd:YAG laser. Pulses of 27ns duration and peak power of 1.7MW for initial transmission of Q-switch 18.4% 0 T = have been obtained. We have obtained Q-switching efficiency of 77% for train of pulses of 31 and 76.2% 0 T = at the pump energy of 98J. We have also obtained the dependency of laser pulse characteristics on pump energy and initial transmission of Q-switch. We have obtained the damage threshold of this Q-switch at the pulse duration of 27ns to be13J cm2 .
Mostafa Tarkashvand, Amir Hossein Farahbod, Seyed Ali Hashemizadeh,
Volume 14, Issue 1 (1-2020)
Abstract

In this paper, the mode structure and time behavior of a LED-pumped Ce:Nd:YAG laser have been studied. Four blue LED bars with total 128 LEDs at 460 nm are utilized to pump a 3 mm diameter laser rod. Using a Cr4+:YAG passive optical switch with 96% initial transmission, and a low loss stable optical resonator and 0.7 J pumping energy, a single 17 micro-joules Q-switched laser pulse with 240 ns pulse-width and nearly TEM00 mode profile was produced. By increasing the pumping energy Ep up to 0.8 J, the mode structure remained intact. Further increasing of Ep, the laser mode changed to TEM10. Numerical calculations show that the central high gain area of the laser rod and saturation mechanism of the passive Q-switch behaves like as a soft aperture to enforce the laser resonator to oscillate on a low order transverse mode. For laser free-running, the TEM00 mode has not been achieved and the optical resonator produced high order transverse mode patterns.

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