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Q: Fachverband Quantenoptik und Photonik

Q 40: Ultrashort laser pulses I

Q 40.7: Vortrag

Donnerstag, 20. März 2014, 12:00–12:15, DO26 207

Direct generation of sub-20 fs pulses tunable from 395 to 950 nm with MHz 1030 nm pumping — Maximilian Bradler, •Bastian Baudisch, and Eberhard Riedle — LS für BioMolekulare Optik, LMU München

Noncollinear optical parametric amplifiers (NOPAs) are now widely used to provide tunable sub-20 fs pulses in the visible and UV for spectroscopic applications. In OPCPAs the principle is used to generate extremely powerful sub-10 fs pulses. The direct generation of pulses tunable in the blue has not yet been demonstrated. We now report sub-20 fs pulses tunable from 393 to 950 nm. The pulses are the signal output of a NOPA pumped with either the second or the third harmonic of a commercial 1030 nm laser with 300 fs duration. Average powers up to 200 mW at 200 kHz and up to 500 mW at 1 MHz are shown. The critical issue to solve was the seed light in the blue as the continuum pumped by 1030 nm only spans to slightly below 500 nm [1,2]. We now use second harmonic pumping of the seed and can such utilize the potential amplification range of the 343 nm pumped NOPA to well below 400 nm. Extremely broadband amplification is found with compression to sub-20 fs. For operation up to 1 MHz special care has to be taken to avoid crystal damage due to two-photon-absorption. By second harmonic generation the range from above 400 nm down to the limit of BBO at 210 nm is accessed in a single conversion stage.

[1] C. Homann, C. Schriever, P. Baum, and E. Riedle, Opt. Express 16, 5746 (2008).

[2] M. Bradler, P. Baum, E. Riedle, Appl. Phys. B 97, 561 (2009).