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An Alexandrite Regenerative Amplifier

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Abstract

In order to obtain very stable frequency output or very short pulses from a laser, cw pumping of the laser has been required. The ability to amplify frequency stable output, short pulses, or diode laser pulses to pulse energies available from pulsed solid-state lasers is highly desirable. This is not a trivial task since the required amplification is in the range of 106 – 1011. This amplification is particularly difficult to obtain from alexandrite since the single-pass amplification is typically between 1.5 and 6. However, by constructing an alexandrite regenerative amplifier (which is a multipass amplifier), we have been able to amplify various sources including 1) the stable single-frequency output of a cw dye laser, 2) subnanosecond pulses from a gain switched laser diode, and 3) the output of a cw femtosecond dye laser. Output energies in the range of 10 mJ have been obtained.

© 1987 Optical Society of America

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