15 February 2012 Amplified spontaneous emission in thin-disk lasers
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Proceedings Volume 8235, Solid State Lasers XXI: Technology and Devices; 82351Q (2012); doi: 10.1117/12.906358
Event: SPIE LASE, 2012, San Francisco, California, United States
Abstract
Amplified spontaneous emission (ASE) and parasitic oscillations (PO) in disk lasers with unstable resonators are investigated theoretically. The efficiency loss due to ASE/PO is essentially determined by the product of disk diameter D and "self-maintain gain" of ASE/PO. Threshold to establish the laser oscillations in presence of ASE/PO is explored as the self-maintain gain of ASE/PO is higher than threshold gain gt of the resonator. The criterion to ignore ASE/PO in disk laser is given by gtD < 2.0 as an ASE absorber is clad, gtD < 0.55 as the disk side is roughened, and gtD <0.8 as the effective ASE path is half reduced. The time evolution of laser output exhibits a strenuous relaxation oscillation, in which ASE plays a role of strong damping, and consume the energy before each of sub-pulses.
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Hua Su, Xiao-Jun Wang, "Amplified spontaneous emission in thin-disk lasers", Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 82351Q (15 February 2012); doi: 10.1117/12.906358; https://doi.org/10.1117/12.906358
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KEYWORDS
Resonators

Laser resonators

Laser damage threshold

Disk lasers

Mirrors

Monte Carlo methods

Nd:YAG lasers

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