15 February 2012 Amplified spontaneous emission in thin-disk lasers
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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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