Open AccessSecond-harmonic generation in periodically poled bulk Rb-doped KTiOPO_4 below 400 nm at high peak-intensities
Author(s) -
Andrius Žukauskas,
Valdas Pasiskevicius,
Carlota Canalias
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.001395
Subject(s) - materials science , optics , second harmonic generation , energy conversion efficiency , doping , crystal (programming language) , nonlinear optics , optoelectronics , poling , attenuation coefficient , laser , physics , computer science , dielectric , ferroelectricity , programming language
We demonstrate that bulk Rb-doped KTiOPO₄ (RKTP) shows improved susceptibility to gray-tracking compared to flux-grown KTiOPO₄ . We show high-fidelity periodic poling of 1 mm thick RKTP with a period of 3.18 µm for second harmonic generation at 398 nm with a normalized conversion efficiency of 1.79%/Wcm. The crystal is used to frequency-double 138 fs-long pulses with an efficiency of 20% and a peak intensity of 560 MW/cm² without visible gray-tracking signs. We demonstrate that two-photon absorption is the predominant mechanism limiting the SHG efficiency in this spectral range at high peak powers and high repetition rates.