We report on a widely tunable synchronously-pumped picosecond OPO combining an aperiodically poled MgOdoped LiNbO3 crystal as a broadband gain medium and an intracavity axially chirped volume Bragg (VBG). Owing to the high dispersion induced by the chirped VBG, only a narrow spectral band, corresponding to a thin slice of the VBG, satisfies the synchronous-pumping condition. At a fixed position, the VBG is thus a narrow-band filtering element; variation of its position along the cavity axis enables to tune the idler wavelength over 215nm around 3.82 μm. Rapid continuous tuning over 150nm in 100 ms is also demonstrated.
Delphine Descloux, Guillaume Walter, Jean-Baptiste Dherbecourt, Guillaume Gorju, Jean-Michel Melkonian, Myriam Raybaut, Cyril Drag, and Antoine Godard, "Dispersion tuning of a narrow-linewidth picosecond OPO based on chirped quasi-phase matching with a volume Bragg grating," Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 1008814 (Presented at SPIE LASE: February 02, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2252168.
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