Abstract
We demonstrate optical transmission results of highly nonlinear As2Se3 optical microwires cladded with fluorine-based CYTOP, and compare them with microwires cladded with typical hydrogen-based polymers. In the linear optics regime, the CYTOP-cladded microwire transmits light in the spectral range from 1.3 µm up to >2.5 µm without trace of absorption peaks such as those observed using hydrogen-based polymer claddings. The microwire is also pumped in the nonlinear optics regime, showing multiple-orders of four-wave mixing and supercontinuum generation spanning from 1.0 µm to >4.3 µm. We conclude that with such a broadband transparency and high nonlinearity, the As2Se3-CYTOP microwire is an appealing solution for nonlinear optical processing in the mid-infrared.
Highlights
The mid-infrared (MIR) range (2-12 μm) of the optical spectrum is intimately associated with vibrational motion in molecules, enabling many applications related to spectroscopy and chemical sensing [1,2,3]
The transmission loss spectrum of As2Se3 microwires cladded with CYTOP is investigated experimentally
For the purpose of referencing, the transmittance of microwires cladded with hydrogen-based polymers that are Cyclo Olefin Polymer (COP) 1020R and PolyMethyl MethAcrylate (PMMA) is performed [14]
Summary
The mid-infrared (MIR) range (2-12 μm) of the optical spectrum is intimately associated with vibrational motion in molecules, enabling many applications related to spectroscopy and chemical sensing [1,2,3]. Among the approaches utilized to generate MIR light, light sources that depend on nonlinear parametric gain, such as parametric oscillators and supercontinuum (SC) sources raise a great deal of interest due to their broadband operation [4,5,6]. Parametric processes in a MIR optical source are supported given that the gain medium possesses a sufficiently large nonlinearity coefficient, a good transparency in the MIR, and allows the access to a group velocity dispersion that is close to zero at the pump wavelength. Chalcogenide (ChG) glasses are such materials compatible with the MIR, covering the spectral range of 1-12 μm for As2Se3 and the range of 1-8 μm for As2S3 [7]. ChG glasses are highly nonlinear media given their intrinsic nonlinear refractive index (n2) up to three orders of magnitude larger than the n2 of silica glass [8]. Nonlinear effects can be enhanced from a high-confinement waveguide geometry such as the fiber microwire and the photonic crystal fiber [9,10]
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