Abstract
We describe a multipass optical amplifier based on a double confocal geometry1 which we have used to amplify femtosecond optical pulses to energies of 90 nJ using only 0.7 W of pump power from a Metalaser copper vapor laser operated at 10 kHz. We use four mirrors of 20-cm radius arranged so that an incident train of pulses passes six times through a gain jet containing a mixture of rhodamine 640 and sulforhodamine 640 in ethylene glycol. The amplified pulses, which have durations of ~50 fs, are sufficiently intense to generate white light continuum pulses in an optical fiber with a 4-μm core.
© 1988 Optical Society of America
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