Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 1: Laser development and applications I
Q 1.6: Vortrag
Montag, 17. März 2014, 11:45–12:00, DO26 207
A multi-Watt-level, all-solid-state laser source for laser cooling of lithium — •Norman Kretzschmar1, Franz Sievers1, Ulrich Eismann2, Frédéric Chevy1, and Christophe Salomon1 — 1Laboratoire Kastler Brossel, CNRS UMR 8552, UPMC, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris, France — 2LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, 61 avenue de l’Observatoire, 75014 Paris, France
Realizing degenerate quantum gases of lithium involves different laser cooling schemes which typically require near-resonant single-frequency light in the watt-level range. In this contribution we report on the development and optimization of an all-solid-state laser source emitting 3.2 W of narrowband 671 nm light in a near-diffraction-limited beam.
Our design is based on a diode-end-pumped Nd:YVO4 ring laser operating at 1342 nm. We discuss the further mitigation of detrimental thermal lensing effects in the Nd:YVO4 crystal which is the main prerequisite for power scaling of Nd-lasers at this wavelength.
The infrared light is subsequently frequency doubled to 671 nm: In this context we compare the high-power performances of an enhancement cavity using periodically poled Potassium Titanyl Phosphate (ppKTP) to a periodically poled LiNbO3 (PPLN) waveguide module allowing a technologically simplified single pass wavelength conversion process.
We demonstrate the suitability of this spectrally narrow light source for cold atom experiments with lithium by employing it for D1-sub-Doppler laser cooling of 6Li atoms.