Near-degenerate doubly resonant synchronously pumped OPO for intracavity THz generation

Joseph E. Schaar; Jason S. Pelc; Konstantin L. Vodopyanov; Martin M. Fejer

doi:10.1117/12.765315

13 February 2008 Near-degenerate doubly resonant synchronously pumped OPO for intracavity THz generation

Joseph E. Schaar, Jason S. Pelc, Konstantin L. Vodopyanov, Martin M. Fejer

Proceedings Volume 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII; 68750B (2008) https://doi.org/10.1117/12.765315
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

Abstract

We developed a source of terahertz-frequency radiation using intracavity difference-frequency mixing in three types of micro-structured GaAs between the signal and idler waves of a doubly resonant synchronously pumped optical parametric oscillator (DRO). The pump, signal, and idler waves were type-II quasi-phase-matched (QPM) by a 10-mm-long magnesium-doped periodically poled LiNbO₃ crystal. The oscillator operated near frequency degeneracy with signal and idler bandwidths of 100-200 GHz. The DRO was pumped by a CW-mode-locked laser with a 1064-nm wavelength, 7-ps pulse width, 50-MHz repetition rate, and average power of 10 W. The cavity round-trip power losses were 4-5% for each wave, and at the largest pump power as much as 120 W of total signal and idler average power was stored inside the cavity. We developed an electronic locking feedback network that provided >15 minutes of stable DRO operation with over 100 W of intracavity average power and power fluctuations of 5-10%. The signal and idler pulse widths were characterized with an extracavity sum-frequency generation process between the pump and resonant OPO pulses. We developed a split-step Fourier propagator to model the temporal properties of the signal and idler pulses, and we found excellent agreement with experimental results.

Citation Download Citation

Joseph E. Schaar, Jason S. Pelc, Konstantin L. Vodopyanov, and Martin M. Fejer "Near-degenerate doubly resonant synchronously pumped OPO for intracavity THz generation", Proc. SPIE 6875, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII, 68750B (13 February 2008); https://doi.org/10.1117/12.765315

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