Radiative transfer in participating media with collimated short-pulse Gaussian irradiation

Radiative transfer in a one-dimensional absorbing and isotropically scattering plane-parallel grey medium with a collimated short-pulse Gaussian irradiation on one of its boundaries is studied. The medium is non-emitting and the boundaries are non-reflecting and non-refracting. The Galerkin method is extended for the solution of the transient radiative transfer problem. The transient transmittance and reflectance of the medium are evaluated for various optical thicknesses, scattering albedos and pulse durations.


Excitonic effects on the nonlinear optical properties of small quantum dots
KARABULUT, İBRAHİM; Safak, H.; Tomak, Mehmet (IOP Publishing, 2008-08-07)
The excitonic effects on the nonlinear optical properties of small quantum dots with a semiparabolic confining potential are studied under the density matrix formalism. First, within the framework of the strong confinement approximation, we present the excitonic states and then calculate the excitonic effects on the nonlinear optical properties, such as second harmonic generation, third harmonic generation, nonlinear absorption coefficient and refractive index changes. We find the explicit analytical expres...
A multi-spectroscopic study of luminescence sensitivity changes in natural quartz induced by high-temperature annealing
SCHILLES, T; POOLTON, NRJ; Bulur, Enver; Botter-Jensen, L; MURRAY, AS; Smith, G; RIEDI, PC; WAGNER, GA (IOP Publishing, 2001-03-07)
The luminescence sensitivity of natural quartz is significantly enhanced if heated beyond the first and second crystal phase transitions, in the temperature range 500-1100 degreesC. This work employs a number of complementary spectroscopic methods to obtain a fuller understanding of the mechanisms of this sensitization process. Spectrally resolved radioluminescence is used to study the role played by hole trapping recombination sites. Linearly-modulated optically stimulated luminescence is used to probe a n...
Hasanlı, Nızamı; MELNIK, NN; RAGIMOV, AS (Wiley, 1983-01-01)
Measurements are made of polarized Raman scattering and infrared reflection spectra of twenty two compositions of GaS1‐xSex layer mixed crystals grown by the Bridgman method. Besides the usual one‐mode and two‐mode behaviours of phonon modes, a number of more complex dependences characterized by the appearance of additional bands in the spectra of mixed crystals are observed. Their appearance is accounted for by the uncovering of the Brillouin zone due to the disturbance of the periodicity of the crystal la...
Optical constants of Tl4Ga3InSe8 layered single crystals
Goksen, K.; Hasanlı, Nızamı (Elsevier BV, 2007-11-15)
The optical properties of Tl(4)Ga(3)lnSe(8) layered single crystals have been studied by means of transmission and reflection measurements in the wavelength range of 500-1100 run. The analysis of the room temperature absorption data revealed the presence of both optical indirect and direct transitions with band gap energies of 1.94 and 2.20 eV, respectively. Transmission measurements carried out in the temperature range of 10-300 K revealed that the rate of change of the indirect band gap with temperature i...
Assessment of InSb photodetectors on Si substrates
Ozer, S; Beşikci, Cengiz (IOP Publishing, 2003-03-07)
We present the detailed characteristics of small area (33 x 33 mum(2)) InSb photodiodes grown on GaAs coated Si substrates by molecular beam epitaxy. In spite of very large lattice mismatch, 80 K peak detectivity of similar to1 x 10(10) cm Hz(1/2) W-1 has been measured under backside illumination without anti-reflection coating. Differential resistance at 80 K is limited by Ohmic leakage under small reverse bias and trap assisted tunnelling (TAT) under moderately large reverse bias. In the temperature range...
Citation Formats
H. T. Okutucu Özyurt, “Radiative transfer in participating media with collimated short-pulse Gaussian irradiation,” JOURNAL OF PHYSICS D-APPLIED PHYSICS, pp. 1976–1983, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56491.