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

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 0.86 W corresponding to SHG power densities in the ridge waveguide core > 1 MW/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.

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