Tellurite microstructure fibers with small hexagonal core for supercontinuum generation

Abstract

Tellurite glass microstructure fibers with a 1 microm hexagonal core were fabricated successfully by accurately controlling the temperature field in the fiber-drawing process. The diameter ratio of holey region to core (DRHC) for the fiber can be adjusted freely in the range of 1-20 by pumping a positive pressure into the holes when drawing fiber, which provides much freedom in engineering the chromatic dispersion. With the increase of DRHC from 3.5 to 20, the zero dispersion wavelengths were shifted several hundred nanometers, the cutoff wavelength due to confinement loss was increased from 1600 nm to 3800 nm, and the nonlinear coefficient gamma was increased from 3.9 to 5.7 W(-1)/m. Efficient visible emissions due to third harmonic generation were found for fibers with a DRHC of 10 and 20 under the 1557 nm pump of a femtosecond fiber laser. One octave flattened supercontinuum spectrum was generated from fibers with a DRHC of 3.5, 10 and 20 by the 1064 nm pump of a picosecond fiber laser. To the best of our knowledge, we have for the first time fabricated a hexagonal core fiber by soft glass with such a small core size, and have demonstrated a large influence of the holey region on the dispersion, nonlinear coefficient and supercontinuum generation for such fiber.

Strong infrared spectral broadening in low-loss As-S chalcogenide suspended core microstructured optical fibers

“…The latter parameter is a key tool to obtain an efficient light conversion and to reach accordable fibered broadband sources in the mid infrared. Much effort has been recently devoted to obtain MOF from various glasses [21][22][23]. Nevertheless, an efficient conversion up to 5 µm to cover entirely the 3-5 µm window is still a target to reach.…”

Temporal solitons and pulse compression in photonic crystal waveguides

“…In addition to the aforementioned dispersion engineering, additional research has centered on reducing the required intensity of chip-scale nonlinear effects via material engineering. Semiconductors [11,17], chalcogenides [18][19][20], tellurites [21], and doped silica [22], have Kerr coefficients that are typically at least two orders of magnitude larger than silica fiber, further reducing the required energy threshold in integrated structures. In summary, the highly confined optical modes in dispersion-engineered semiconductor PhCWGs offer a long awaited development of low-intensity threshold nonlinearities to compliment the wellestablished large dispersion of periodic media [12-14, 23, 24].…”

Microstructured chalcogenide optical fibers from As_2S_3 glass: towards new IR broadband sources

“…2). This homemade laser source is described in [36]. By varying the input peak power between 0.5 kW and 5.6 kW we have obtained a strong continuous broadening of the initial pulse spanning over more than 1500 nm and extending from about 1 µm until around 2.6 µm in the infrared (Fig.…”