A5055625985- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Orbital Angular Momentum in Optics
- Liquid Crystal Research Advancements
- Spectroscopy and Laser Applications
- Nonlinear Optical Materials Studies
- Photonic Crystals and Applications
- Laser Material Processing Techniques
- 2D Materials and Applications
- Plasmonic and Surface Plasmon Research
- Covalent Organic Framework Applications
- Advanced Nanomaterials in Catalysis
- Plant Water Relations and Carbon Dynamics
- Petroleum Processing and Analysis
- Solid State Laser Technologies
- Transition Metal Oxide Nanomaterials
- Polymer Nanocomposite Synthesis and Irradiation
- Ga2O3 and related materials
- MXene and MAX Phase Materials
- Microfluidic and Bio-sensing Technologies
- Chemical Synthesis and Analysis
- Asymmetric Hydrogenation and Catalysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Field-Flow Fractionation Techniques
- Graphene research and applications
Institut National de la Recherche Scientifique
2021-2025
Shahid Beheshti University
2013-2022
Iranian Center for Quantum Technologies
2017
We present an in-depth study on the impact of spatiotemporal Raman enhancement in molecular gas-filled hollow-core fibers (HCFs), demonstrating efficient generation and post-compression multidimensional solitary states (MDSS). Through different experimental scenarios—employing large-core HCFs filled with gases (N2 N2O) driven by high energy, sub-picosecond picosecond Fourier transform-limited ytterbium laser pulses—this work leverages multimode propagation enhanced interactions to achieve...
The thermal lens model is developed to predict the nonlinear phase shift and convection velocity of a liquid sample based on self-phase modulation effect in presence convective heat process. This analysis will be useful study flow for prediction velocity. To clarify, measurements are investigated under chopped laser beam passing through cell containing solution dye with without natural flow. experimental data verify time evolution far-field on-axis intensity model.
In this work, gold nanorods (GNRs) were synthesized using a seed-mediated route and their photothermal properties investigated experimentally as well theoretically.
The synthesis of a novel recoverable catalyst based on graphene and NHC for the cross dehydrogenative coupling aldehydes is described, as well amides construction C–C bonds.
We propose a mechanical-hydrodynamical experimental setup in which the microfluidic motion manipulates optical birefringence of levitated graphene oxide liquid crystal. The sample is changed by flowing crystal micro-channel. By measuring ordinary and extraordinary refractive indices at five flow rates, one can determine value samples, precisely. Our results demonstrate that, adjusting concentration rate dispersion nano flakes, induced be controlled. It also shown that this approach used as an switch.
Multidimensional solitary states (MDSS) are self-sustaining light wave packets confined in multiple dimensions multimode fibers. In this work, we experimentally demonstrate the generation of MDSS, driven by a few hundreds femtoseconds (fs) long frequency doubled pulses from Titanium:Sapphire chirped pulsed amplifier nitrous oxide-filled hollow core fiber (HCF). The MDSS output, resulting intermodal interactions Raman-active gas-filled large diameter HCF, features broadband, red-shifted...
In this study, water-based nanofluid containing titanium oxide nanoparticles with Rutile phase was employed to improve the efficiency of a typical flashlamp-pumped Nd:YAG laser. The pulse energy has been raised up 86 mJ or about 12% in comparison pure deionized water. Theoretical approach showed that heat transfer coefficient TiO2 based is higher than water (about 14%) which increases laser due better removal from gain media. To evaluate effects utilization on pump source efficiency, for...
Abstract Background Ecosystem service mapping is an important tool for decision-making in landscape planning and natural resource management. Today, pollination based on the Lonsdorf model (InVEST software) that determines availability of nesting floral resources each land cover estimates according to foraging range desired species. However, it argued has significant limitations estimating a can affect results this model. Results This paper presents free software, named PollMap, does not...
In this paper, we examine the light scattering by flow of levitated flakes in a micro-channel to characterize tunable functionality graphene oxide liquid crystal nematic phase. Light interaction with mentioned material is decomposed scattered and transmitted parts they can determine orientation flakes. Our results demonstrate that, pumping sample through leads increase amplitude light. The time averaged intensity grows increasing volume fraction. We also find higher fraction, sooner reaching...
Manipulation of the nonlinear optical response materials plays a significant role in photonics applications; however, it may be irreversible, untunable, and uncontrollable, which makes difficult. In this Letter, we present mechanical-hydrodynamical approach through microchannel to tune absorption graphene oxide liquid crystals. material, properties depend on flake orientation. This feature has helped us study empirically dependency coefficients external hydrodynamical force by employing...
The electro-optic effect is an important mechanism for actively tuning the refractive index of materials. This has various applications in communication, switching, modulation, and nonlinear optics. research measured quadratic coefficient a graphene oxide (GO) film with ellipsometry spectroscopy. results show that this about three orders magnitude greater than other GO its giant Kerr can improve devices based on effect. For example, it decrease power consumption complexity these due to need...
In this paper, we investigate the crossing statistics of speckle patterns formed in Fresnel diffraction region by a laser beam scattering through nanofluid. We extend $zero-crossing$ to assess dynamical properties According joint probability density function fluctuation and its time derivative, theoretical framework for Gaussian non-Gaussian regimes are revisited. count number crossings not only at {\it zero} level but also all available thresholds determine average speed moving particles....
We experimentally demonstrate the formation of multidimensional solitary states (MDSS) in N <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O-filled hollow-core fiber (HCF), driven by ultraviolet (UV) pulses.
We experimentally demonstrate the formation of multidimensional solitary states (MDSS) in N 2 O-filled hollow-core fiber (HCF), driven by ultraviolet (UV) sub-picosecond pulses.