Ti:sapphire-pumped deep-infrared femtosecond optical parametric oscillator based on CdSiP2
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European Commission's projectMid-TECH - Infrared sensing made visible: Combining infrared light sources and upconversion sensors for improved sensitivity in medical applications and gas analysis (EC-H2020-642661)
We report on a femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on the Kerr-lens-mode-locked Ti:sapphire laser as the pump source. By deploying a novel cascaded intracavity arrangement, comprising a femtosecond OPO based on the nonlinear crystal, CdSiP2CdSiP2, synchronously pumped internal to a MgO:PPLN femtosecond OPO, we have generated broadly tunable radiation across 5958–8117 nm using rapid static cavity delay tuning, with a maximum power of 64 μW at 6791 nm, limited by the absorption in mirror substrates as well as polarization-dependent intracavity losses. The deep-IR idler power exhibits excellent passive stability of better than 1.1% rms over 2 h, with a spectral bandwidth as large as ∼650 nm∼650 nm at ∼6800 nm∼6800 nm. The demonstrated concept is generic and can be similarly deployed in other operating time scales and wavelength regions, also using different laser pump sources and nonlinear materials.
CitationRamaiah-Badarla, V. [et al.]. Ti:sapphire-pumped deep-infrared femtosecond optical parametric oscillator based on CdSiP2. "Optics Letters", 15 Abril 2016, vol. 41, núm. 8, p. 1708-1711.