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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 8 — Apr. 9, 2012
  • pp: 8503–8511

Broadband third harmonic generation in tapered silica fibres

Timothy Lee, Yongmin Jung, Christophe A. Codemard, Ming Ding, Neil G. R. Broderick, and Gilberto Brambilla  »View Author Affiliations

Optics Express, Vol. 20, Issue 8, pp. 8503-8511 (2012)

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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.

© 2012 OSA

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4160) Nonlinear optics : Multiharmonic generation
(190.4370) Nonlinear optics : Nonlinear optics, fibers

ToC Category:
Nonlinear Optics

Original Manuscript: November 7, 2011
Revised Manuscript: January 16, 2012
Manuscript Accepted: January 16, 2012
Published: March 28, 2012

Timothy Lee, Yongmin Jung, Christophe A. Codemard, Ming Ding, Neil G. R. Broderick, and Gilberto Brambilla, "Broadband third harmonic generation in tapered silica fibres," Opt. Express 20, 8503-8511 (2012)

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