Abstract
Using a novel (to our knowledge) broadband Yb-doped crystal cooled in a closed loop to we demonstrate a chirped pulse regenerative laser amplifier delivering the energy of up to at a repetition rate of and an average output power of at . The gain narrowing in the laser crystal is compensated by shaping the amplitude of the seed pulse spectrum. As the result, at the highest amplified pulse energy we obtain a FWHM bandwidth supporting a pulse duration, assuming ideal compression. Amplified pulses were recompressed from with a transmission grating compressor.
© 2009 Optical Society of America
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