Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 1: Laser development and applications I
Q 1.1: Vortrag
Montag, 17. März 2014, 10:30–10:45, DO26 207
Continuous Wave turquois laser in Pr3+:BaY2F8 — •Kore Hasse1, Philip Werner Metz1, Daniela Parisi2, Nils-Owe Hansen1, Christian Kränkel1,3, Mauro Tonelli2, and Günter Huber1,3 — 1Institut für Laser-Physik, Universität Hamburg — 2NEST-Istituto Nanoscience-CNR and Dipartimento di Fisica, Università di Pisa — 3The Hamburg Centre for Ultrafast Imaging, Universität Hamburg
Pr3+-doped crystals are known for efficient lasing on several transitions from the green to the dark red spectral range. Here we report on the first crystalline continuous wave solid state Pr3+-doped laser emitting in the blue, based on Pr3+:BaY2F8. While the higher Stokes efficiency should improve the laser efficiency, the short upper state lifetime of the Pr3+-ion below 50 µs makes it challenging to generate the high excitation densities needed for such a three-level laser. The main advantage of Pr3+:BaY2F8 in this respect is the presence of a comparably intense emission line at 495 nm terminating into an energetically high lying Stark level of the 3H4 ground state, which only requires inversion levels as low as 5 % to obtain gain.
Lasing was obtained under InGaN laser diode pumping at 445 nm and pumping with a frequency doubled optically pumped semiconductor laser at 479.6 nm. In the latter case 172 mW of output power at 495 nm with a slope efficiency of 24 % were achieved. Further improvement can be expected from a better resonator geometry, more suitable mirror coatings and an optimized length and doping concentration of the active material.