Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 72: Ultrashort Laser Pulses III

Q 72.2: Talk

Friday, March 4, 2016, 15:45–16:00, a310

High-speed stimulated Raman scattering microscopy with an all-optical nonlinear modulator — •Tobias Steinle, Moritz Floess, Andy Steinmann, and Harald Giessen — 4th Physics Institute and Research Center SCOPE, University of Stuttgart, 70550 Stuttgart, Germany

We introduce a novel technique for high-frequency modulation of femtosecond pulses based on period doubling enabled by nonlinear feedback in an optical parametric oscillator (OPO). We demonstrate the applicability of this technique in a stimulated Raman scattering experiment, where the modulated Raman pump is directly derived from the OPO, while the Stokes is provided by the same Yb:KGW oscillator that pumps the OPO. It is shown that the technique works over a broad spectral range with sufficient modulation depth. With this scheme, the highest possible modulation frequency, namely half the repetition rate, is achieved. Further, the modulation is intrinsically synchronized with the reference pulse train. Hence, it provides optimum performance in any pump-probe scheme. Also, it is scalable to higher modulation frequencies by scaling the repetition rate of the system.