The physics and applications of fiber-based supercontinuum (SC) sources have been a subject intense interest over the last decade, with significant impact on both basic science industry. New uses for SC are also constantly emerging due to their unique properties that combine high brightness, multi-octave frequency bandwidth, fiber delivery, single-mode output. few years seen research efforts focused extending wavelength coverage towards 2 20 $\mu$m molecular fingerprint mid-infrared (MIR)...

Abstract Mid‐infrared supercontinuum (mid‐IR SC) sources in the 2–20 µm molecular fingerprint region are high demand for a wide range of applications including optical coherence tomography, remote sensing, spectroscopy, and hyperspectral imaging. Herein, mid‐IR SC generation is investigated cascaded silica‐ZBLAN‐chalcogenide fiber system directly pumped with commercially available pulsed laser operating telecommunications window at 1.55 µm. This fiber‐based shown to generate flat broadband...

Abstract In this paper, we report the design and fabrication of a highly birefringent polarization-maintaining photonic crystal fiber made from chalcogenide glass, its application to linearly-polarized supercontinuum generation in mid-infrared region. The was drawn using casting method As 38 Se 62 glass which features transmission window 2 10 μ m high nonlinear index 1.13 × –17 W −1 . It has zero-dispersion wavelength (ZDW) at 4.56 for fast axis 4.68 slow and, average ZDW, large...

Oligomers of proline (oligo-Pro) are valuable models for studying the structural and thermodynamic properties all-trans polyproline II (PPII) helix. These peptides, in their rigid PPII form, serve as spectroscopic molecular rulers. However, cis/trans isomerization can lead to undesired all-cis PPI conformation nonpolar solvents. In this study, we investigated mechanisms stabilize structure by analyzing regions Protein Data Bank (PDB) observed a high prevalence α-helices β-turns at C-termini...

The linear and nonlinear properties of laser-drawn silicon core fibers (SCFs) are characterized in the telecom band for first time. We show that SCFs produced with micrometer-sized diameters exhibit low optical losses (∼1 dB/cm) straight from drawing tower, indicating a high-quality crystalline materials. Moreover, by using an adapted fiber tapering method, diameter these can be precisely tailored to obtain longitudinal profiles optimized loss coupling, uniform waist regions over lengths up...

Peptidomimetic modifications enhance their rigidity, cell permeability, and proteolytic stability of peptides, presenting significant promise for drug development. One such modification involves the isosteric replacement peptide backbone CαH with a nitrogen (N) atom, resulting in azapeptides. In azapeptides, there are two N atoms within single residue, possibility substituting either one or both simultaneously. Previous studies have effectively mimicked side chain substitution patterns...

In this paper we investigate supercontinuum generation in several suspended-core soft-glass photonic crystal fibers pumped by an optical parametric oscillator tunable around 1550 nm. The were drawn from lead-bismuth-gallium-cadmium-oxide glass (PBG-81) featuring a wide transmission window 0.5 to 2.7 μm and high nonlinear refractive index up 4.3·1019 m2/W. They have been specifically designed with microscale suspended hexagonal core for efficient We experimentally demonstrate two spectra...

We report a silica glass nested capillary anti-resonant nodeless fiber with transmission and low bending sensitivity in the mid-infrared around 4000 nm. The is characterized terms of over 1700–4200 nm wavelengths, revealing 3500–4200 window, clearly observable for 12 m long fiber. Bending loss 0.5 dB/m measured three full turns 40 mm radius, going up to 5 15 radius. Our results provide experimental evidence hollow-core fibers which nested, capillaries high bend resistance mid-infrared. This...

We demonstrate broadband supercontinuum generation in an all-normal dispersion polarization-maintaining photonic crystal fiber and report the observation of a cross-phase modulation instability sideband generated outside bandwidth. that this is polarized on slow axis can be suppressed by pumping fiber’s fast axis. theoretically confirm model nonlinear process using phase-matching conditions numerical simulations, obtaining good agreement with measured data.

Improved long-wavelength transmission and supercontinuum (SC) generation is demonstrated by antireflective (AR) nanoimprinting tapering of chalcogenide photonic crystal fibers (PCFs). Using a SC source input spanning from 1 to 4.2 μm, the total 15 μm core diameter PCF was improved ∼53% ∼74% AR structures on both output facets fiber. Through combined effect reduced reflection redshifting spectrum 5 relative light >3.5 in same fiber increased 60.2%. Further extension 8 achieved using tapered...

Polycrystalline silicon germanium (SiGe) core fibers offer great potential as flexible nonlinear platforms. Compared to Si fibers, the SiGe material offers higher coefficients, extended mid-infrared wavelength coverage, and possibility tune bandgap index of refraction through varying Ge concentration. Here with 10% were fabricated using molten drawing method, followed by CO₂ laser irradiation. The transmission properties subsequently improved further a fiber tapering tailor...

Chalcogenide-glass-based optical fibers are excellent photonic platforms for nonlinear applications in the mid-IR region due to their wide transmission window, tunable dispersion and high nonlinearity. There is particular interest combining chalcogenide fiber platform with polarization-preserving properties as this will allow polarization-dependent measurements while minimizing detrimental effects thus enable new interferometric techniques, gas sensing, integrated-optic devices coherence tomography.

Intensity fluctuations in supercontinuum generation are studied polarization-maintaining (PM) and non-PM all-normal dispersion tellurite photonic crystal fibers. Dispersive Fourier transformation is used to resolve the shot-to-shot spectra generated using 225-fs pump pulses at 1.55 μm, with experimental results well reproduced by vector scalar numerical simulations. By comparing relative intensity noise for PM cases, supported simulations, we demonstrate advantage of property fibers...

Molybdenum disulfide (MoS2) has emerged as a versatile two-dimensional material platform for many optical and optoelectronic applications due to its layer-dependent band structure, which can be tuned from direct indirect by increasing the number of layers. In this work, integration MoS2 layers onto D-shaped side-polished fiber been demonstrated using an inkjet printing technique. We show that devices exhibit strong wavelength dependent transmission spectrum, with transmittance dip ~ –50 dB,...

Polycrystalline silicon-germanium (SiGe) core fibers offer great potential as flexible platforms for microscale optoelectronic and nonlinear optical devices. Compared to silicon (Si) fibers, the SiGe material provides higher coefficients, extended mid-infrared wavelength coverage, a means tune bandgap index of refraction by varying Ge composition. Here, (10 at% Ge) were fabricated using molten drawing method, followed CO

We report a small-core UV-grade silica multimode photonic crystal fiber for nonlinear frequency conversion in the ultraviolet spectral region. The has been fabricated using F110 UV-Grade glass from Heraeus, which features excellent transmission and low solarization UV window. Pumping core at 355 nm with picosecond laser pulses, we observe appearance of parametric sidebands several spatial modes up to 380 nm. modelled this process intermodal phase-matching conditions obtained agreement...

Silica glass nested capillary anti-resonant fiber is reported. Transmission measured with 150cm long sample over 1700-4200nm wavelengths, revealing a 3500-4200nm window. The bending insensitive down to 0.5cm radius full loop.

Supercontinuum (SC) generation towards the mid-infrared (MIR) range is an active field of research and development motivated by a wide applications including optical coherence tomography (OCT), material processing, sensing absorption spectroscopy. In this work, we investigate mid-IR SC in cascaded silica soft-glass fiber system directly pumped with commercially-available picosecond laser operating telecommunications window at 1.55 μm. This all-fiber shown to generate flat broadband mid-IR-SC...

In this paper, we investigate mid-IR SC generation in a cascaded silica-ZBLAN-chalcogenide fiber system directly pumped with commercially-available 460-ps pulsed laser operating the telecommunications window at 1.55 µm. This fiber-based is shown to generate flat broadband covering entire range from 2 10 µm tens of mW output power. technique paves way for low cost, practical, and robust sources without requirement mid-infrared pump or Thulium-doped amplifiers. We also describe fully realistic...

We compare real-time noise measured using dispersive Fourier transform spectroscopy in supercontinuum generated PM and non-PM all-normal dispersion tellurite fibers show that fiber provides better stability higher coherence.

Low-temperature deposited polycrystalline silicon waveguides are emerging as a flexible platform that allows for dense optoelectronic integration. Here, the optical transmission properties of poly-silicon have been characterized from near-to-mid-infrared wavelength regime, extending well beyond previous reports in telecom band. The poly-Si with dimension 3 µm × ∼0.6 produced pre-patterned amorphous post-processed through laser melting, reflowing, and crystallization using highly localized...