Coherent midinfrared supercontinuum generation using a rib waveguide pumped with 200  fs laser pulses at 28  μm

Abstract

A rib waveguide structure in AsSe chalcogenide glass has been designed and numerically analyzed for on-chip coherent supercontinuum generation in the midinfrared region. The waveguide structure possesses an all-normal dispersion profile with dispersion value of -13.22 ps/nm·km at the pump wavelength. Coherent midinfrared supercontinuum spectrum spanning 1.2 to 7.2 μm has been obtained using a 2.5 mm long rib waveguide when pumped with 200 fs laser pulses of a peak power of 2.5 kW and a repetition rate of 1 kHz at 2.8 μm. Such highly nonlinear subwavelength size rib waveguide structures are highly applicable for the power efficient on-chip midinfrared coherent supercontinuum sources. Coherent midinfrared supercontinuum sources are very important in frequency metrology, nonlinear microscopy, nondestructive testing, molecular spectroscopy, and optical coherence tomography.

Coherent supercontinuum generation in tellurite glass regular lattice photonic crystal fibers

“…The demonstrated tellurite glass ANDi PCFs also extend the current state-of-the-art in fibers designed for pulse-preserving, femtosecond supercontinuum generation, under pumping with lasers operating at standard wavelengths. Up to date, this line-up included fibers made of silica and germanium-doped silica fibers [28,29] and highly nonlinear silicate fibers [39], as well as ANDi chalcogenide glass fibers and waveguides, enabling at least an octave of normal dispersion supercontinuum under femtosecond pumping around 2070 nm [41] or at around 2700-2800 nm [42][43][44][45]. Fig.…”

Design of dispersion-engineered As2Se3 channel waveguide for mid-infrared region supercontinuum generation

“…shot to shot coherence over the entire SC output 20 . Planar waveguides alternative to the microstructured fibers, nowadays, are being considered for broadband SC sources design due to their short interaction length, scalable and low cost integrated optical chip fabrication [21][22][23][24][25][26][27] .…”

“…To date, a few of the following longest wavelength theoretical and experimental SC spectral evolution were demonstrated through optical planar waveguide and fiber based designs [24][25][26][27][28][29][30][31][32] . Yu et al 24 reported SC generation spanning up to the MIR covering the wavelength range 2 to 10 µm by an all-ChG rib waveguide using GeAsSe and GeAsS glasses for its upper and lower claddings, respectively, with 330-fs pulses pumped at 4.184 µm with an input peak power of 4.5 kW.…”

Highly coherent supercontinuum generation in a polarization-maintaining CS2-core photonic crystal fiber

“…In 2017, Petersen et al demonstrated mid-infrared SC generation in a large-mode-area chalcogenide PCF taper [16]. In 2018, Saini et al investigated the coherent SC generation in chalcogenide W-type coaxial optical fiber, step-index tellurite fiber, and rib waveguide [17][18][19]. In the same year, Nguyen et al obtained mid-infrared SC with good coherence in cascaded tellurite and chalcogenide fibers [20].…”