Abstract
Fiber-feedback optical parametric oscillators (OPOs) incorporate intracavity fibers to provide a compact high-energy wavelength-tunable laser platform; however, dispersive effects can limit operation to the sub-picosecond regime. In this research article, we modeled pulse propagation through systems of cascaded fibers, incorporating SMF-28 and ultra-high numerical aperture (UHNA) fibers with complementary second-order dispersion coefficients. We found that the pulse duration upon exiting the fiber system is dominated by uncompensated third-order effects, with UHNA7 presenting the best opportunity to realise a cascaded-fiber-feedback OPO.
Highlights
Optical parametric oscillators (OPOs) provide a versatile platform for the generation of wavelengths ordinarily inaccessible directly from laser gain media [1,2,3], and have found applications in spectroscopy [4], metrology [5] and multi-photon imaging [6]
The ultra-high numerical aperture (UHNA) fibers have core diameters ≤ 2.5 μm [23], presenting an acute coupling challenge. We addressed this by using SMF-28 Ultra as an input/output coupler, taking advantage of the larger 8.2 μm core diameter and connectorized end facets, resulting in a cascaded SMF-28/UHNA/SMF-28 fiber system
We modeled pulse propagation through systems of cascaded SMF-28 and UHNA
Summary
Optical parametric oscillators (OPOs) provide a versatile platform for the generation of wavelengths ordinarily inaccessible directly from laser gain media [1,2,3], and have found applications in spectroscopy [4], metrology [5] and multi-photon imaging [6]. The cavity length is selected to provide periodic temporal overlap between the incoming pump and resonant signal pulse trains, with a length directly equal to that of the pump laser providing the highest gain [8]. Meeting these criteria becomes increasingly challenging when moving to a high-energy regime with few-MHz repetition frequencies, as long cavity lengths introduce space and engineering constraints [9]. We simulated pulse propagation through lengths of SMF-28 Ultra (Corning) and ultra-high numerical aperture fibers (UHNA, Coherent-Nufern) to identify combinations that balance both second- and third-order dispersive effects to support femtosecond operation
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