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Chen, Bo-Han; Kretschmar, Martin; Ehberger, Dominik; Blumenstein, Andreas; Simon, Peter; Baum, Peter; Nagy, Tamas (2018): Compression of picosecond pulses from a thin-disk laser to 30fs at 4W average power. In: Optics Express, Vol. 26, No. 4: pp. 3861-3869
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Abstract

We investigate two approaches for the spectral broadening and compression of 1-ps long pulses of a thin-disk laser amplifier running at 50 kHz repetition rate at 1030 nm wavelength. We find that with a single, 2.66-m long stretched flexible hollow fiber filled with xenon gas, Fourier transform limited output pulse duration of 66 fs can be directly reached. For larger pulse shortening, we applied a hybrid cascaded approach involving a BBO-based pre-compressor and a long hollow fiber. We could achieve 33-times temporal shortening of 1-ps pulses down to a duration of 30 fs at an overall efficiency of similar to 29% with an output power level of 3.7 W. These results demonstrate the potential of stretched flexible fibers with their free length scalability for shortening laser pulses of moderate peak power.