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  • 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference
  • (Optica Publishing Group, 2017),
  • paper CD_12_1

Optical Parametric Oscillators: New Horizons

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Abstract

The remarkable progress in nonlinear materials and laser pump sources continues to advance optical parametric oscillators (OPOs) to new frontiers in spectral and temporal coverage and performance capability, with no end in sight. The advent of a new class of mid-infrared (mid-IR) birefringent nonlinear materials such as CdSiP2 (CSP) and quasi-phase-matched (QPM) crystals such as orientation-patterned GaP (OP-GaP) has finally paved the way for the practical development of OPOs into the deep-IR at wavelengths beyond 4 µm, where multiphonon absorption in oxide-based QPM materials such as MgO:PPLN has proved a persistent barrier to direct wavelength generation for more than two decades. By exploiting the newly developed nonlinear crystals in combination with well-established and widely available Nd-based solid-state and Yb-doped fiber lasers near ~1 m, new OPO sources in different time-scales from pulsed nanosecond to ultrafast picosecond and few-cycle femtosecond domain have been realized, accessing spectral regions across 5-12 m in deep-IR, and offering unprecedented performance capabilities. On the other hand, the exploitation of cascaded pumping techniques in combination with CSP has made possible the generation of femtosecond pulses out to ~8 m in the deep-IR using the Kerr-lens-mode-locked Ti:sapphire laser as the primary pump source (Fig. 1). At the same time, to enable the exploitation of alternative materials for deep-IR generation, recent efforts have led to the development of practical high-power near-degenerate Yb-fiber-laser-based picosecond OPOs at ~2.1 m (Fig. 2) as alternative pump sources for birefringent crystals such as ZnGeP2 and QPM crystal such as OP-GaAs.

© 2017 IEEE

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