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Communication Dans Un Congrès Année : 2017

Supercontinuum generation in an optical fiber capillary filled with Toluene

Résumé

Summary form only given. Liquid-core optical fibers (LCOFs) have recently been identified as extremely attractive waveguides for applications to frequency conversion and supercontinuum (SC) generation [1-4]. Their advantages over silica optical fibers include broad visible to mid-infrared transparency and enhanced material nonlinearities by physical processes specific to anisotropic liquid molecules [3]. As a result, there has been extensive interest in the use of nonlinear liquids, such as CS 2 or ethanol, for applications in visible and mid-infrared SC generation [2-4]. Here we demonstrate, for the first time to our knowledge, efficient visible supercontinuum generation in an optical fiber capillary filled with Toluene pumped by a picosecond pulsed laser at 532 nm. Although operating in the strong normal dispersion regime, we show in this study that SC is generated through the combined effects of multiple cascaded Raman scattering and stimulated Raman-Kerr scattering (SRKS). The latter enables a large spectral broadening of the Raman lines owing to the strongly anisotropic orientational relaxation of liquid molecules [5]. This is shown experimentally in Fig 1(a) that shows a set of output spectra recorded by increasing the input pump pulse energy from 3 nJ to 200 nJ. As can be seen, flat and broad SC generation from 550 nm to 870 nm is achieved for the highest pump energy (top spectrum). In this experiment, we used a 2-m long 9μm-core-diameter Toluene-filled LCOF pumped by a Nd:YAG 18-ps pulsed laser at 532 nm. The SC dynamics can be examined from the spectra at lower energies. We first observe two cascaded Raman vibrational lines shifted by 30 THz and 60 THz, respectively (blue vertical arrows in Fig. 1(a)), coming from the aromatic ring molecular breathing mode. Increasing further the energy gives rise to an additional far-detuned Raman peak shifted by 92 THz from the pump, (horizontal red arrow in Fig. 1(a)), from the C-H symmetric stretching vibrational mode o...
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Dates et versions

hal-02134434 , version 1 (20-05-2019)

Identifiants

  • HAL Id : hal-02134434 , version 1

Citer

Gil Fanjoux, Samuel Margueron, Jean-Charles Beugnot, Thibaut Sylvestre. Supercontinuum generation in an optical fiber capillary filled with Toluene. Conference on Lasers and Electro-Optics/Europe and the European Quantum Electronics Conference, Jun 2017, Munich, Germany. ⟨hal-02134434⟩
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