Berlin 2005 – scientific programme
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Q: Quantenoptik und Photonik
Q 39: Nichtlineare optische Effekte & Lichtquellen
Q 39.8: Talk
Tuesday, March 8, 2005, 12:30–12:45, HU 2014a
Diode-pumped compact broadband femtosecond white-light laser sources using tapered fibers — •Jörn Teipel1, Diana Türke1, Harald Giessen1, Alexander Killi2, and Uwe Morgner2 — 1Institut für Angewandte Physik, Wegelerstr. 8, D-53115 Bonn — 2MPI für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg
The generation of supercontinua in photonic fibers with different kinds of laser sources has recently gained a lot of attention. It was shown that femto-, pico-, and even nanosecond pulses are suitable for continuum generation. Theoretically there is a large market for white light laser sources, e.g., for OCT, for frequency metrology, or in spectroscopy and microscopy. But the generally expensive fs laser system limits the number of applications. Therefore, our approach was the reduction of the costs of the laser system in combination with a minimization of its size. The Yb:glass oscillator has the ability of generating fs pulses and the advantage of being directly diode-pumped, which dramatically cuts the costs of this laser system. At the same time the size of the system becomes very compact. We report on the combination of a cavity dumped Yb:glass oscillator that runs at a wavelength of 1040 nm with tapered fibers of different diameters, and thus different zero-dispersion wavelengths. The laser has a repetition rate of 166 kHz, a pulse duration of 250 fs, and a maximum pulse energy of 300 nJ. Furthermore, we use the frequency-doubled output of this laser at 520 nm with 300 fs pulse duration and a maximum pulse energy of 50 nJ. Respectively, up to 1200 nm and 400 nm broad single mode supercontinua were generated - well suited for the above mentioned applications.