Supercontinuum generation in short tellurite microstructured fibers pumped by a quasi-cw laser

Abstract

We investigate supercontinuum (SC) generation in highly nonlinear tellurite microstructured fibers pumped by a continuous wave (cw)/quasi-cw laser. We investigate two types of tellurite fibers. One type has the constant core diameter, and the other type has a longitudinally varying core diameter. For the fibers with a constant core diameter, when pumped in the anomalous dispersion region, the SC is symmetric in a fiber that has a zero dispersion wavelength close to the pump wavelength. For the fibers with a longitudinally varying diameter, the calculated phase-matching conditions show that they have a broad wavelength range of dispersive waves, and therefore the measured SC spectrum can be broader than one octave. In this work, the fiber lengths are as short as several tens of centimeters, and the pump power is in the watt level.

Numerical Investigation of Mid-Infrared Supercontinuum Generation in GeAsSe Based Chalcogenide Photonic Crystal Fiber Using Low Peak Power

“…However, silica fibers cannot be used in the MIR regime owing to their high losses in the spectral range beyond 3 µm which caused a gradual shift towards other types of glasses that posses large transmission windows having transparency into the long wavelength region. Alternative to fused silica, SC generation was also demonstrated using bismuth (Ebendroff-Heidepriem et al, 2004), lead silicate (Petropoulos et al, 2003), fluoride (Qin et al, 2009), tellurite (Domachuk et al, 2008;Liao et al, 2012;Agrawal et al, 2013), and ZBLAN fibers (Kulkarni et al, 2011).…”

Flat mid-infrared supercontinuum generation in tapered fiber with thin coating of highly nonlinear glass

“…dispersion profile) and the large amount of input power which is necessary in order to turn on the corresponding non linear processes. Therefore new materials, such as soft glasses including tellurite [5][6][7] , chalcogenite 8-10 , fluoride 11,12 and lead-bismuthgalate 13 glasses have been adopted for their high optical transparency in the long wavelength range. Although this is a relatively new research domain, the results already achieved are very impressive and promising regarding practical applications of SC sources.…”

Three-octave spanning supercontinuum generation in a fluoride (ZBLAN) fiber

“…However, as a result of multiphoton absorption, spectral broadening in silica glasses is limited to below 3 µm [9], which makes them unsuitable for continuum generation in the mid-infrared (mid-IR) spectral band. Therefore, soft glasses including tellurite [10,11], chaclogenide [12,13] and fluoride [14][15][16] glasses have been adopted for mid-IR SC generation. Tellurite and fluoride glasses exhibit high optical transparency in the long-wavelength range of up to ~5 µm [10,17], while chalcogenide glasses are transparent even above 7 µm wavelength [18].…”

“…Therefore, soft glasses including tellurite [10,11], chaclogenide [12,13] and fluoride [14][15][16] glasses have been adopted for mid-IR SC generation. Tellurite and fluoride glasses exhibit high optical transparency in the long-wavelength range of up to ~5 µm [10,17], while chalcogenide glasses are transparent even above 7 µm wavelength [18]. Chalcogenide fibers are also characterized by high nonlinearity, and therefore, they are especially appropriate for the enhancement of nonlinear processes occurring in a medium.…”