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Generation of µW level plateau harmonics at high repetition rate

: Hädrich, S.; Krebs, M.; Rothhardt, J.; Carstens, H.; Demmler, S.; Limpert, J.; Tünnermann, A.

Postprint (1.3 MByte; PDF; )

Optics Express 19 (2011), No.20, pp.19374-19383
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer IOF ()

The process of high harmonic generation allows for coherent transfer of infrared laser light to the extreme ultraviolet spectral range opening a variety of applications. The low conversion efficiency of this process calls for optimization or higher repetition rate intense ultrashort pulse lasers. Here we present state-of-the-art fiber laser systems for the generation of high harmonics up to 1 MHz repetition rate. We perform measurements of the average power with a calibrated spectrometer and achieved µW harmonics between 45 nm and 61 nm (H23-H17) at a repetition rate of 50 kHz. Additionally, we show the potential for few-cycle pulses at high average power and repetition rate that may enable water-window harmonics at unprecedented repetition rate.