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Recent developments in the field of nonlinear optics with photonic crystal fibers have led to the realization of supercontinuum spectra or parametric sources of correlated photons. However the nonlinearities were still limited by the use of silica. Hollow core photonic crystal fibers (HCPCF) filled with highly nonlinear liquids or gases enable the implementation of more performing nonlinear devices...
By repeated optical breakdown with focused femtosecond pulses, we decrease the refractive index of fused silica by few percent. The subsequent micro-lens formation is associated with a reduction of multiphoton absorption in all dielectrics.
A holey fiber design with a high index nanostructure that can achieve an effective mode area not in excess of 0.3 mum2 and a flat dispersion at the 1.55 mum band is proposed and studied.
A new type of tellurite chalcogenide glass is proposed and simulated at the microscopic molecular level using GAMESS. The ab initio study shows that the optical linear polarizability alpha and second-order hyperpolarizability gamma per unit increase ~1.5 times and ~2 times respectively by replacing O with S in chain-like structures Te<Ox>Te (X=O or S), resulting in an estimation of linear refractive...
We demonstrate four-wave mixing in silicon nitride waveguides with -7.1 dB conversion efficiency between the signal and idler. We observe no evidence of nonlinear losses with pump powers as high as 110 W.
We theoretically and experimentally demonstrate that thermal effect in ultra-high-Q silica toroidal microresonators can be compensated by applying a layer of polydimethylsiloxane (PDMS). The observed Q factor is 1.5times106 for coating thickness of 0.52 mum.
By exploiting the excellent nonlinear properties of a novel silica based low-loss high index glass (Hydex reg), we demonstrated low peak power, efficient ps pulse compression in a 45 cm spiral waveguide.
A concept for orthogonal intracavity control of phase and group delay by a specially designed compensator assembly is investigated theoretically and experimentally. This assembly greatly simplifies carrier-envelope phase control and experiments in extreme nonlinear optics.
Nonlinear femtosecond pulse propagation in all-solid photonic bandgap fiber is investigated experimentally and numerically for both the photonic bandgap guiding in the central silica core and the total internal reflection in germanium doped inclusions.
Thermal poling was utilized to induce second-order nonlinearity in silica waveguides written by femtosecond laser pulses. Nonlinearity in the waveguides was found to be lower than non-modified regions.
Optical sum-frequency generation and ferroelectric-like switching in Si-O polar structures comprised of Si nanocrystals (nc-Si) in mesoporous silica was reported and attributed to polar layers lying at the interfaces between one-side bounded nc-Si and host.
We demonstrate strong coupling between two stacked micro-optomechanical silicon nitride disks. The induced frequency splitting almost spans a full free-spectral range. Mechanical oscillations excited by repulsive/attractive gradient forces modulate the coupling modulation at several MHz.
We demonstrate parametric oscillation in a complementary metal-oxide-semiconductor (CMOS) compatible silicon nitride ring resonator. We generate up to 40 wavelengths with a threshold power as low as 50 mW.
We demonstrate four-wave-mixing with <5 mW CW pump power in high-index, doped silica glass micro-ring resonators. We also demonstrate efficient self-phase modulation for pulses with <100 W peak power, with negligible nonlinear absorption up to 25 GW/cm2.
We demonstrate on-chip optical trapping of micron-sized dielectric spheres using supercontinuum light and silicon nitride waveguides. The broadband source enables scattering spectroscopy to be performed on single particles trapped by a high-confinement waveguide.
We propose a new class of photonic devices based on periodic stress fields in silicon. Our approach creates quasi-phase matched second-order nonlinear processes that can be used, for example, for efficient midwave-infrared generation.
We expose cryogenic (1.6 K) optomechanical properties of high-Q toroidal silica microcavities. A thermally induced optical multistability and the influence of structural defects of amorphous materials on phonon propagation are described.
Filament assisted third harmonic generation is studied at interface. The third harmonic energy induced by the filament crossing the rear surface keeps constant because of intensity clamping during filamentation.
In this article we report the realization of photonic crystal fibers having silica-strand core suspended in air-cladding fabricated using our in-house `stack & draw' technology. The fiber has high potential as a sensing probe in many applications. The fibers' air cladding can be filled with a given sensing fluid which would modify the characteristics of propagating light in presence of the external...
Soliton-effect compression of femtosecond laser pulses in a silicon photonic nanowire at 1.5 µm is numerically investigated. A region of anomalous group velocity dispersion (GVD), small third-order dispersion (TOD), and large nonlinearity of silicon is used to show compression of 30 fs input pulses below 3 fs.
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