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Over 4000 nm Bandwidth of Mid-IR Supercontinuum Generation in sub-centimeter Segments of Highly Nonlinear Tellurite PCFs

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Abstract

We report broad bandwidth, mid-IR supercontinuum generation using a sub-cm (8 mm) length of highly nonlinear tellurite microstructured photonic crystal fiber (PCF). We pump the fiber at telecommunication wavelengths by using 1550 nm, 100 fs pulses of energy E=1.9 nJ. When coupled in the PCF, these pulses result in a supercontinuum (SC) bandwidth of 4080 nm extending from 789 to 4870 nm measured at 20 dBm below the peak spectral power. This bandwidth is comparable or in excess of previously reported spectra for other nonlinear glass fiber formulations despite the significantly shorter fiber length. In addition, besides offering a convenient pump wavelength, short fiber lengths enable smoother SC spectra, lower dispersion, and reduced material absorption at longer wavelengths making the use of this PCF particularly interesting.

©2008 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. (top) A schematic of the experimental arrangement used to generate and deliver fs pump pulses to the tellurite PCF for SC generation. (bottom) The cross sectional profile of the tellurite PCF in electron (b) and optical microscopy (a, c). Scale bar in (b) is 1µm.
Fig. 2.
Fig. 2. (top) Transmittance of a 3 mm billet of bulk tellurite glass. The resulting fiber has a minimum of 1.8 dBm-1 loss at 1420 nm which increases to 8 dBm-1 at 1750 nm (bottom) Dispersion curve of the tellurite PCF. The zero dispersion wavelength is 1380 nm.
Fig. 3.
Fig. 3. Spectral response of the SC generated by the 8 mm segment of Tellurite PCF. The wavelength regions analyzed by the OSA and the monochromator with lead selenide (PbSe) or mercury cadmium telluride (MCT) detectors are indicated. Also indicated is the pump wavelength of 1550 nm.
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