Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Biophotonics
Q 32.4: Vortrag
Mittwoch, 2. März 2016, 11:45–12:00, f342
Synchronization-free all-solid-state laser system for stimulated Raman scattering microscopy — •Moritz Floess1, Tobias Steinle1, Vikas Kumar2, Andy Steinmann1, Marco Marangoni2, Giulio Cerullo2, and Harald Giessen1 — 114th Physics Institute and Research Center Scope, University of Stuttgart, D-70569 Stuttgart, Germany — 22IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy
We demonstrate a simple all-solid-state laser source for stimulated Raman scattering (SRS) microscopy. An 8 W, 450 fs Yb:KGW oscillator with 41 MHz repetition rate pumps an OPA that is seeded by a cw tunable external-cavity diode laser (ECDL). The second-harmonic of the OPA output radiation, generated in a PPLN crystal, acts as the Raman pump beam, tunable between 760 and 820 nm. In contrast to using an OPO as tunable laser source the cw-seeding of the OPA avoids synchronization issues. We demonstrate SRS images with pixel dwell times down to 30 µs with signal-to-noise ratios of up to 50 when investigating polymer beads. Thanks to the favorable noise properties of the solid-state oscillator SNRs of 5 are still possible with 500 ns pixel dwell time.