Open AccessMulti-watt, broadband second-harmonic-generation in MgO:PPSLT waveguides fabricated with femtosecond laser micromachining
Author(s) -
Mark Triplett,
John Khaydarov,
Xiaoshu Xu,
Alireza Marandi,
G. Imeshev,
John F. Arntsen,
Ajit Ninan,
Gregory Miller,
Carsten Langrock
Publication year - 2019
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.27.021102
Subject(s) - materials science , optics , lithium niobate , laser , femtosecond , optoelectronics , second harmonic generation , cladding (metalworking) , lithium tantalate , waveguide , wavelength , physics , metallurgy
We demonstrate optical waveguides fabricated in periodically poled MgO-doped stoichiometric lithium tantalate crystals using an fs-laser direct-write process. Two different waveguide architectures were developed: depressed cladding and stress-induced waveguides. Our strain-optic simulations confirmed the guiding mechanism for either case. We demonstrate designs optimized for low propagation loss (0.52 dB/cm) for both fundamental (1050 nm) and second-harmonic wavelengths (525 nm). Low-power CW second-harmonic-generation studies show normalized efficiencies comparable to that of annealed reverse-proton-exchange waveguides in lithium niobate. High-power studies demonstrate second-harmonic power levels up to 8.5 W in a single-pass configuration, using a 1-nm bandwidth CW IR fiber laser as a pump.