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Q: Fachverband Quantenoptik und Photonik

Q 11: Laserentwicklung (Festkörperlaser II / Andere Laserquellen)

Q 11.2: Vortrag

Dienstag, 11. März 2008, 08:45–09:00, 3H

Towards a compact high-average-power femtosecond supercontinuum source — Felix Hoos¹, •Bernd Braun², and Harald Giessen¹ — ¹4. Physikalisches Institut, Universität Stuttgart — ²FH Nürnberg

In this talk we will present a way towards a cost effective, compact, and highly efficient pump source for high-average-power femtosecond supercontinuum lasers.

Supercontinuum sources have become an important tool for measurements and experiments in various fields of science. There are many experiments for which it is desirable to have a controllable spectral power over a wide wavelength range, e.g., for white light interferometry with low reflective samples, spectroscopy over a wide wavelength range or pump-probe experiments with pump and probe light being extracted from the supercontinuum. Especially for the latter case it might also be important to provide femtosecond pulses for improved temporal resolution. Currently, commercial supercontinuum systems are available with average powers in the order of several watts based on nonlinear fibers pumped by pico- or nanosecond sources. However, until now there exist to our knowledge no high average power femtosecond supercontinuum sources.

We will present our approach for a suitable pump laser for supercontinuum generation based on Yb:KGW in a slab geometry which is pumped by a single laser diode resulting in an average power of several watts. We will discuss the heat removal in the case of a slab geometry of the laser crystal as well as the influence of thermal effects.