Abstract
A free-running mode operation of a Nd:YAG laser allowed to obtain long laser pulses varying from tens to hundreds of microseconds. The laser rod was pumped by a xenon flash-lamp that has been electrically supplied by a pulsed current obtained using a PFN (Pulse forming network) circuit. The output laser pulse width was increased by increasing the number of the PFN meshes. For a PFN circuit with five meshes, the obtained laser pulse widths were 436 and 700 µs depending on the single-mesh current width. The generation of long laser pulses allowed obtaining multipulse with different laser pulse lengths thanks to the use of an insulated gate bipolar transistor (IGBT) instead of a silicon controlled rectifier (SCR) to control the capacitor discharge time into the flash-lamp. In this mode of operation, the number of pulses and the pulse width could be adjusted. The obtained laser pulse widths were of 100 and 25 µs.
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