Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 18: Laserentwicklung: Festkörperlaser
Q 18.3: Vortrag
Montag, 12. März 2012, 17:00–17:15, V38.01
Stable MHz-Repetition-Rate Passively Q-Switched Microchip Laser Frequency Doubled by MgO:PPLN — •Eva Mehner1,2, Andy Steinmann2, Robin Hegenbarth2, Harald Giessen2, and Bernd Braun1 — 1Georg-Simon-Ohm Hochschule Nürnberg — 24. Physikalisches Institut, Universität Stuttgart
We present a Nd3+:YVO4 microchip laser passively Q-switched by a semiconductor saturable absorber mirror. At a wavelength of 1064 nm, the system generates 460 ps pulses with an average output power of 210 mW. The repetition rate was measured to be up to 1.1 MHz with the timing jitter remaining at less than 1%. We discuss the influence of different setup parameters by using numerical simulations of the coupled rate equations and FEM-simulations of the heat distribution within the crystal. We show that single longitudinal and transversal mode operation is the key factor to achieve high pulse-to-pulse stability. Furthermore the IR-light was frequency doubled in a MgO:PPLN crystal with up to 75% conversion efficiency. To our knowledge, this is the highest conversion efficiency ever achieved with a microchip laser.