Pulse shape control in a dual cavity laser: numerical modeling

Yuri Yashkir

doi:10.1117/12.662339

17 April 2006 Pulse shape control in a dual cavity laser: numerical modeling

Yuri Yashkir

Proceedings Volume 6190, Solid State Lasers and Amplifiers II; 619018 (2006) https://doi.org/10.1117/12.662339
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

We present a numerical model of the laser system for generating a special shape of the pulse: a steep peak at the beginning followed by a long pulse tail. Laser pulses of this nature are required for various applications (laser material processing, optical breakdown spectroscopy, etc.). The laser system consists of two "overlapped" cavities with different round-trip times. The laser crystal, the Q-switching element, the back mirror, and the output coupler are shared. A shorter pulse is generated in a short cavity. A small fraction of this pulse is injected into the long cavity as a seed. It triggers generation of the longer pulse. The output emission from this hybrid laser produces a required pulse shape. Parameters of the laser pulse (ratios of durations and energies of short- and long- pulse components) can be controlled through cavity length and the output coupler reflection. Modelling of the laser system is based on a set of coupled rate equations for dynamic variables of the system: the inverse population in an active laser media and photon densities in coupled cavities. Numerical experiments were provided with typical parameters of a Nd:YAG laser to study the system behaviour for different combinations of parameters.

Citation Download Citation

Yuri Yashkir "Pulse shape control in a dual cavity laser: numerical modeling", Proc. SPIE 6190, Solid State Lasers and Amplifiers II, 619018 (17 April 2006); https://doi.org/10.1117/12.662339

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KEYWORDS

Pulsed laser operation

Laser systems engineering

Output couplers

Laser crystals

Laser processing

Mirrors

Nd:YAG lasers

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