Watt-level yellow emitting lasers by frequency doubling of high power diode lasers

R. Bege, D. Jedrzejczyk, J. Hofmann, G. Blume, D. Feise, F. Bugge, K. Paschke, G. Tränkle

Published in:

Proc. SPIE 10238, SPIE OPTICS + OPTOELECTRONICS, Prague, Czech Republic, Apr. 26-27, 102380X (2017).

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Abstract:

Distributed Bragg reflector tapered diode lasers (DBR-TPL) based on a quantum-well structure are presented, which emit at various wavelengths between 1100 and 1200 nm. Long lifetimes of these diode lasers are demonstrated. The lasers feature a high radiance facilitating a highly efficient second harmonic generation (SHG) in lithium niobate (PPMgO:LN) ridge waveguide crystals in a single-pass configuration. SHG output powers up to 0.86W corresponding to SHG power densities in the ridge waveguide core > 1MW/cm2 are achieved for nearly diffraction limited beams at wavelengths of 561, 578 and 589 nm. Absorption behavior at these power densities is investigated without observation of nonlinear absorption phenomena.

Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany

Keywords:

diode laser, distributed Bragg reflector laser, second harmonic generation, visible laser, lithium niobate, ridge waveguide crystal.