Abstract
We present a multipass femtosecond amplifier pumped by a Nd-YAG laser where the gain medium is given by a variable length dye cell. This system allows amplification factors up to 5 · 106 and output pulse energies of 150 μJ, while restricting the contribution of amplified spontaneous emission to 0.5% of the total output energy, without using any saturable absorber stage. A detailed study of the output pulsewidth as a function of the duration of the input chirped pulse is also presented.
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Mataloni, P., Santosuosso, M. & De Martini, F. High gain amplification of femtosecond pulses with low amplified spontaneous emission in a multipass dye cell. Appl. Phys. B 52, 273–276 (1991). https://doi.org/10.1007/BF00325404
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DOI: https://doi.org/10.1007/BF00325404