Open AccessBroadband third harmonic generation in tapered silica fibres
Author(s) -
Timothy Lee,
Yongmin Jung,
Christophe A. Codemard,
M. D. Ding,
Neil G. R. Broderick,
Gilberto Brambilla
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.008503
Subject(s) - optics , materials science , broadband , bandwidth (computing) , harmonic , second harmonic generation , microfiber , nonlinear optics , optoelectronics , acoustics , physics , laser , telecommunications , computer science , composite material
Optical microfibres have recently attracted much attention for nonlinear applications, due to their tight modal confinement. Here, we report broadband third harmonic generation based on the intermodal phase matching technique in silica microfibres of several centimetres. The third harmonic signal is predominantly generated from the taper transition regions (rather than the waist), wherein the range of diameters permits phase matching over a wide bandwidth. Microfibres up to 4.5 cm long were fabricated with waist diameters below 2.5 μm to allow a λ = 1.55 μm pump to phase match with several higher order third harmonic modes; conversion rates up to 3 × 10⁻⁴ were recorded when pumped with 4 ns pulses at a peak power of 1.25 kW. Analysis of the third harmonic frequencies generated from the nonlinearly broadened pump components indicate a 5 dB conversion bandwidth of at least 36 nm, with harmonic power detected over a 150 nm range.