An analytical formulation has been developed for the shielding effectiveness of a rectangular enclosure with an aperture. Both magnetic and electric may be calculated as function frequency, dimensions, aperture dimensions position within enclosure. Theoretical values are in good agreement measurements. The theory extended to account circular apertures, multiple effect contents.

A goal for the validation of computational electromagnetics (CEM) is to provide community with a simple method that can be used predict assessment electromagnetic compatibility (EMC) data as it would undertaken by individuals or teams engineers. The benefits being able do this include quantifying comparison has hitherto only been assessed qualitatively, ability track differences between model iterations, and means capturing variability range opinions groups workers. feature selective (FSV)...

The progress, and current challenges, in fabricating rare-earth-doped chalcogenide-glass fibers for developing mid-infrared (IR) fiber lasers are reviewed. For the first time a coherent explanation is forwarded failure to date develop gallium-lanthanum-sulfide glass mid-IR laser. more covalent chalcogenide glasses, importance of optimizing host processing routes order minimize non-radiative decay avoid rare earth ion clustering devitrification discussed. new idea explored explain an...

We theoretically demonstrate a novel approach for generating Mid-InfraRed SuperContinuum (MIR SC) by using concatenated fluoride and chalcogenide glass fibers pumped with standard pulsed Thulium (Tm) laser (T FW HM =3.5ps, P 0 =20kW, ν R =30MHz, avg =2W).The fiber SC is generated in 10m of ZBLAN spanning the 0.9-4.1μmSC at -30dB level.The then coupled into 10cm As 2 Se 3 Microstructured Optical Fiber (MOF) designed to have zero-dispersion wavelength (λ ZDW ) significantly below 4.1μm...

We present a study of chalcogenide glass fiber lasers doped with Dy 3+ , Pr or Tb that would operate in the mid-infrared wavelength range.A set samples different concentrations rare earth ions is fabricated.The modeling parameters are directly extracted from FTIR absorption measurements fabricated bulk using Judd-Ofelt, Füchtbauer-Ladenburg theory and McCumber theory.The results show that, for all dopants considered, an efficient laser action possible if optical losses kept at level 1dB/m below.

Chalcogenide glass fibers have attractive properties (e.g. wide transparent window, high optical non-linearity) and numerous potential applications in the mid-infrared (MIR) region. Low loss is desired important development of these fibers. Ge-As-Se has a large glass-forming range to provide versatility choice from continuously varying physical properties. Recently, broadband MIR supercontinuum generation been achieved chalcogenide by using core/clad. structure. In shaping fiber preforms,...

A fast and accurate method is developed to compute the natural frequencies scattering characteristics of arbitrary-shape two-dimensional dielectric resonators. The problem formulated in terms a uniquely solvable set second-kind boundary integral equations discretized by Galerkin with angular exponents as global test trial functions. log-singular term extracted from one kernels, closed-form expressions are derived for main parts all operators. resulting discrete scheme has very high...

An electromagnetic analysis of thin-disk semiconductor resonators with uniform and nonuniform gain regions is presented. A "cold-cavity-with-gain" Maxwellian formulation, including accurate boundary radiation conditions, considered as an eigenvalue problem, for the real-valued parameters frequency threshold material gain. Although well-known approximate effective-index method used to reduce a three-dimensional (3-D) field problem two-dimensional (2-D) one, rigorous formulation latter...

We study numerically the effect of periodicity on plasmon-assisted scattering and absorption visible light by infinite finite gratings circular silver nanowires. The grating is a convenient object analysis because possibility to reduce problem one period. use well-established method partial separation variables however make an important improvement casting resulting matrix equation Fredholm second-kind type, which guarantees convergence. If wires have sub-wavelength radii, then two types...

We select a chalcogenide core glass, AsSe, and cladding GeAsSe, for their disparate refractive indices yet sufficient thermalcompatibility fabricating step index fiber (SIF) mid-infrared supercontinuum generation (MIR-SCG).The dispersion of both bulk glasses is measured over the 0.4 µm-33 µm wavelength-range, probing electronic vibrational behavior these glasses.We verify that two-term Sellmeier model unique to describe wavelength range which experimentally determined extinction coefficient...

We present numerical modeling of mid-infrared (MIR) supercontinuum generation (SCG) in dispersion-optimized chalcogenide (CHALC) step-index fibres (SIFs) with exceptionally high aperture (NA) around one, pumped mode-locked praseodymium-doped (Pr(3+)) fibre lasers. The 4.5um laser is assumed to have a repetition rate 4MHz 50ps long pulses having peak power 4.7kW. A thorough design optimisation was conducted using measured material dispersion (As-Se/Ge-As-Se) and loss obtained fabricated the...

We present a study of mid-infrared photoluminescence in the wavelength range 3.5–5.5 μm emitted from Pr3+: GeAsGaSe core/GeAsGaSe cladding chalcogenide fiber. The Pr3+ doped fiber optic preform is fabricated using extrusion and successfully drawn to low optical loss, step-index Broadband observed fiber, both under 1.55 or 1.94 excitation. Absorption, emission, spectra bulk glass are presented. Luminescent lifetimes measured for Judd–Ofelt parameters calculated. radiative transition rates...

Rare earth (RE)-ion doped chalcogenide glasses are attractive for mid-infrared (MIR) fiber lasers operation >4 μm. Our prior modeling suggests that praseodymium (Pr) is a suitable RE-ion dopant realizing selenide-based, chalcogenide-glass, step index (SIF) MIR laser operating at 4-5 μm wavelength. Fabrication of glass fiber, especially with small core, demanding process because crystallization must be avoided during the heat treatments required to effect shaping. Here, 500 ppmw (parts per...

An analysis is presented of the shielding effectiveness (SE) a rectangular enclosure with an aperture in one face. The treated as length waveguide and coplanar strip transmission line. Theoretical values SE agree measurements for range enclosures, apertures frequencies. variation position also correctly predicted.

The lasing characteristics of a photonic molecule in the form two optically coupled semiconductor microdisks are investigated. Electromagnetic analysis spectra and linear thresholds whispering-gallery (WG) modes four different symmetry classes is presented. Here, Maxwell's equations accurate boundary radiation conditions considered as specific "cold-cavity-with-gain" eigenvalue problem. Each pair real-valued parameters -frequency threshold material gain. In two-dimensional (2-D)...

The photoluminescent-(PL)-properties of Pr³⁺-ions in indium-containing selenide-chalcogenide bulk-glasses are found to be superior when compared with gallium-containing analogues. We observe circa doubling mid-infrared (MIR) PL intensity from 3.5 6 μm for bulk glasses, pumped at 1.55 wavelength, and an increased excited state lifetime 4.7 μm. is reported optically-clad fiber. Ga addition well known enhance RE³⁺ solubility behavior, believed form ([RE³⁺]-Se-[Ga(III)]) the glasses. Indium has...

The mid-infrared (MIR) emission behavior of Tb 3 -doped Ge-As-Ga-Se bulk glasses (500, 1000, and 1500 ppmw ) unstructured fiber (500 is investigated when pumping at 2.013 μm.A broad band observed 4.3-6.0μm corresponding to 7 F 5 → 6 , with an lifetime 12.9 ms 4.7 μm.The 4 level depopulated nonradiatively so it proposed that may operate as a quasi-three-level MIR laser.Underlying glass-impurity vibrational absorption bands are numerically removed give the true cross section, required for...

The paper reports on the coupling of Parity-Time (PT)-symmetric whispering gallery resonators with realistic material and gain/loss models. Response PT system is analyzed for case low high gain dispersion, also two practical scenarios when pump frequency not aligned resonant desired mode there imbalance in profile. results show that presence dispersion misalignment causes skewness bifurcation significant reduction breaking point, respectively. Finally, we demonstrate a lasing operation which...

This Letter, to the best of our knowledge, reports mid-infrared fiber lasing beyond 5 µm at room temperature for first time, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mi mathvariant="normal">C</mml:mi> mathvariant="normal">e</mml:mi> </mml:mrow> <mml:mn>3</mml:mn> <mml:mo>+</mml:mo> </mml:msup> </mml:math> -doped, chalcogenide glass, step index employed in-band pumping with a 4.15 quantum cascade laser. The...

Abstract In-situ combustion (ISC) is a well-established enhanced oil recovery (EOR) technique, traditionally used for high-viscosity reservoirs. However, its application to low-viscosity reservoirs presents challenges due the high ignition temperature required and insufficient heavy fractions sustain combustion. This study investigates ISC feasibility in U.S. reservoir by conducting three experiments—two wet one dry—using rock samples from different wells capture heterogeneities performance....

This paper presents a transmission-line modeling (TLM) algorithm, which is based upon unstructured tetrahedral meshes. In comparison with the conventional, usually Cartesian, scheme, use of such meshes provides significant enhancement in flexibility and accuracy TLM simulations, permitting both smooth boundary approximations diversely sized elements multiscale problems. A full theoretical development algorithm presented for first time canonical problems are used to demonstrate computational...