SBS REFLECTION MIRROR AND HIGH-REPETITION-PULSE LASER SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To output a pulse laser beam which has high efficiency and high mean power with high stability.

SOLUTION: The pulse laser beam oscillated by an oscillation part 1 is amplified by a preamplifier part 2 into an output to have a saturation gain at a main amplification part 7, and the output is made incident on a beam shaping part 4 through an optical isolator 3. The incident laser beam is magnified by a beam magnifier 11 of the beam shaping part and shaped by an apodizer 12 into a flat beam profile. A 90°rotator 15 makes polarizing directions of the beams passing through main amplifiers 14 and 16 of the main amplification part orthogonal. A multi-SBS cell constituting a phase conjugate mirror 8 rotates a laser beam incident on a plurality of SBS (stimulated Brillouin scattering) cells by a rotary prism while synchronizing its speed with the repetition of the pulse laser beam. The polarizing directions of the main amplification parts are made orthogonal by a Faraday rotator 18 and an outgoing beam output is taken out by a polarizer 6.

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