Abstract
An optical parametric oscillator (OPO) based on magnesium-oxide-doped periodically poled lithium niobate (MgO:PPLN) is demonstrated to deliver visible femtosecond pulses, which were created through the intra-cavity nonlinear interactions within the PPLN itself. The signal from the OPO produces femtosecond pulses in the near-infrared region tunable from 1050 to 1600 nm. Visible femtosecond pulses in the range of 522-800 nm and those of 455-540 nm, respectively, were generated via second-harmonic generation (SHG) of signal photons and through sum-frequency generation (SFG) of pump and signal photons. Maximum output efficiencies of 9.2% at 614 nm and 8.0% at 522 nm for the SHG and SFG are attained, respectively, where the efficient visible pulse generation relies on the quasi-phase matching with the aid of the higher-order grating momentum.
Highlights
Optical parametric oscillators (OPOs) are capable of generating femtosecond pulses that are tunable over broad spectral ranges in the ultraviolet, visible, near-infrared (NIR), and midinfrared wavelengths [1,2,3,4]
We report on the generation of visible femtosecond pulses through the second-harmonic generation (SHG) of signal photons or the sum-frequency generation (SFG) of signal and pump photon, which occurs at the gain material of an OPO operating in the NIR wavelength
In an OPO operating in the near-infrared wavelength, we demonstrated on the generation of visible femtosecond pulses through the parametric down-conversion (PDC) and the intra-cavity SHG or SFG at the same PPLN crystal
Summary
Optical parametric oscillators (OPOs) are capable of generating femtosecond pulses that are tunable over broad spectral ranges in the ultraviolet, visible, near-infrared (NIR), and midinfrared wavelengths [1,2,3,4]. J. Yee, “Synchronously pumped optical parametric oscillator based on periodically poled MgO-doped lithium niobate,” Opt. Express 16(8), 5299–5304 (2008).
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