Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Ultrashort Laser Pulses: Applications II
Q 34.8: Talk
Wednesday, March 10, 2010, 15:45–16:00, F 342
Ultrafast solid-state lasers for frequency comb stabilization — •T. Südmeyer1, M. C. Stumpf1, S. Pekarek1, A. E. H. Oehler1, C. Fiebig2, K. Paschke2, G. Erbert2, J. M. Dudley3, and U. Keller1 — 1Department of Physics, ETH Zurich, Switzerland — 2Ferdinand-Braun-Institut für Höchstfrequenztechnik, Berlin, Germany — 3Institut FEMTO-ST, CNRS-Université de Franche-Comté, Besançon, France
Very recently, we demonstrated the first self-referencable ultrafast solid-state laser oscillator operating in the 1500 nm spectral region. Here we present for the first time the full CEO frequency stabilization and repetition rate stabilization of this laser. Our system is based on a 170-fs Er:Yb:glass laser generating 110 mW output power at less than 1.5 W electrical power consumption. It generates a coherent octave spanning frequency comb in a polarization maintaining highly nonlinear fiber (PM-HNLF) without any amplification. Our free-running CEO-beat is 49 dB above the noise floor and its linewidth of 3.6 kHz is more than an order of magnitude lower than typically obtained by free-running ultrafast fiber laser systems. The CEO frequency was stabilized by feedback on the diode current from a phase-locked loop (PLL). A stable CEO-beat was observed even with pulse durations above 260 fs.
Furthermore, we present the first femtosecond SESAM-modelocked Yb:KGW laser operating at 1 GHz repetition rate. We generated 120 mW output power in 317-fs pulses at 1030 nm for 1.7-W pump power from a high-brightness single-frequency DBR tapered diode laser.