4.6 Article

Fiber-laser-pumped high-repetition-rate picosecond optical parametric generation and amplification in MgO:PPLN

Journal

OPTICS LETTERS
Volume 45, Issue 22, Pages 6126-6129

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OL.403699

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Funding

  1. Ministerio de Ciencia, Innovacion y Universidades (MICINN), Spain [TEC2015-68234-R]
  2. Generalitat Catalunya (CERCA)
  3. European Social Fund [BES-2016-079359]
  4. Fundacio Privada Cellex
  5. FundacioMir-Puig
  6. Severo Ochoa [CEX2019-000910-S]

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We report the generation of tunable high-repetition-rate picosecond pulses in the near-infrared at high average power with record conversion efficiency using single-pass optical parametric generation (OPG) and amplification (OPA) in MgO:PPLN, for the first time, to the best of our knowledge. By deploying a mode-locked Yb-fiber laser at 1064 nm providing 21 ps pump pulses at 80 MHz, and a cascade of two 50-mm-long MgO:PPLN crystals, we generate up to 8.3 W of total average output power at a conversion efficiency of 59% over a tunable range of 513 nm, across 1902-2415 nm, with a record threshold as low as 600 mW (7.5 nJ). The two-stage OPG-OPA scheme provides control over fine wavelength tuning and output spectral bandwidths, enabled by the independent control of phase-matching in each crystal. The OPG-OPA output exhibits high spatial beam quality and excellent passive power and central wavelength stability better than 0.9% rms and 0.1% rms, respectively, over 1 hour. The output pulses have a duration of similar to 11 ps, with a 10 dB bandwidth of similar to 350 nm at 2107 nm. (C) 2020 Optical Society of America

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