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Compact 300-J/300-GW Frequency-Doubled Neodymium Glass Laser—Part I: Limiting Power by Self-Focusing

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4 Author(s)
Potemkin, A.K. ; Inst. of Appl. Phys., Russian Acad. of Sci., Nizhny Nvogorod ; Khazanov, Efim A. ; Martyanov, M.A. ; Kochetkova, M.S.

Small-scale self-focusing is the main cause of power limitation in nanosecond Nd:glass lasers. We report pioneer observation in experiment of laser beam noise amplification for B -integral (nonlinear phase) order of unity, i.e., without destruction of nonlinear medium. Analytical dependences of noise amplification coefficient on the B-integral have been obtained for one nonlinear medium as well as for two nonlinear media separated by an air gap with image relay. A simple analytical dependence has been found for an optimal distance between two nonlinear media for which the maximum allowable value of B -integral increases from 2.7 to 4.3. The maximum attainable energy in neodymium-phosphate glass lasers with rod amplifiers 10 cm in diameter is 400 J with a pulse duration of 1 ns.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:45 ,  Issue: 4 )

Date of Publication:

April 2009

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