Hannover 2003 – scientific programme

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Q: Quantenoptik

Q 6: Pulserzeugung NIR/Vis/UV

Q 6.1: Talk

Monday, March 24, 2003, 11:00–11:15, B302

Selfstarting diode-pumped femtosecond Yb:fluoride-phosohate glass-laser using a semiconductor saturable absorber mirror — •Gabriela Paunescu, Joachim Hein, Jens Philipps, Thomas Töpfer, Gisela Quednau, Sebastian Podleska, and Roland Sauerbrey — Institut für Optik und Quantenelektronik, Friedrich- Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany

We have developed a diode-pumped femtosecond Yb:fluoride phosphate-glass laser, generating 118 fs pulses at a repetition rate of 122.6 MHz. Stable selfstarting modelocking was achieved with 1.9 W absorbed power, 2% output coupler, and using semiconductor saturable absorber mirrors with different amounts of saturable absorption. With 2% saturable absorption, the laser emits up to 45 mW at wavelengths between 1033 nm and 1048 nm. With 0.6% saturable absorption, output power up to 100 mW is obtained and the wavelength range is shifted by about 10 nm to longer wavelengths. Increasing the group-velocity dispersion by increasing the prism insertion, multiple pulsing was observed. In this regime we noticed a continuous change of pulse spacing from half cavity round-trip time until the pulses tend to overlap and modelocking brakes down.