Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 53: Quantum Optics and Photonics III
Q 53.7: Vortrag
Donnerstag, 8. März 2018, 12:00–12:15, K 0.016
Fine tuning of third harmonic phase-matching in tapered fibre via external gas pressure — •Jonas Hammer1,2, Riccardo Pennetta1, Philip St.J. Russell1,2, and Nicolas Y. Joly1,2 — 1Max-Planck Institute for the Science of Light, Erlangen, Germany — 2University of Erlangen-Nuremberg, Erlangen, Germany
Micrometer-scale fibre tapers (FTs) are an interesting platform for nonlinear optics, since tight light confinement can provide very high effective nonlinearity. This allows the observation of nonlinear effects at moderate pump energies, provided the dispersion landscape is designed to satisfy the phase-matching (PM) conditions [1]. Here, we focus on the generation of third harmonic. For this process the conservation of photon momentum implies that n(ωp) = n(3ωp), where ωp is the pump frequency [2]. In waveguides the chromatic dispersion prevents intra-modal PM. The inter-modal PM conditions set strict constraints on the diameter of the FT, which are hard to fulfill during the fabrication procedure. Here, we fabricated a FT with a waist diameter of 0.68 µ m. We obtained inter-modal PM between the HE11 mode in the IR and HE12 in mode in the visible. Surrounding the FT with argon gas permits the third-harmonic wavelength to be tuned by 0.12 nm/bar. Pressure-tuning greatly relaxes the fabrication tolerances for third harmonic generation in FT, which is extremely advantageous in systems with a fixed pump wavelength.
References
[1] T.A. Birks et al., Opt. Lett. (25), 1415 (2000).
[2] R.W. Boyd, Nonlinear Optics, 3rd ed. (Academic press, 2008).