scholarly journals Light waves scattering from an anisotropic semi-soft boundary medium with spectral dependence

2021 ◽  
Vol 51 (2) ◽  
Author(s):  
Zhiru Huang ◽  
Qihang Dai ◽  
Xiaoling Ji ◽  
Tao Wang
Keyword(s):  
Spectral Density ◽  
Scattered Field ◽  
Spectral Dependence ◽  
Scattering Medium ◽  
Center Wavelength ◽  
Maximum Value ◽  
Light Waves ◽  
Degree Of Coherence ◽  
Spectral Degree ◽  
Scattering Potential

The far-zone behavior of polychromatic light waves on scattering from an anisotrophic semi-soft boundary medium with spectral dependence was considered, and the spectral density and the spectral degree of coherence of the far-zone scattered field were investigated. It is shown that the distributions of the spectral density and the spectral degree of coherence of scattered field are closely related with the rms width, the center wavelength, and the maximum value of the center wavelength of the scattering potential of the scattering medium.

Interpretation of Time-of-Flight Distributions Resulting from Pulsed Laser-Induced Desorption

1988 ◽  
Vol 100 ◽  
Author(s):  
M. Buck ◽  
P. Hess
Keyword(s):  
Kinetic Energy ◽  
Spectral Dependence ◽  
Quartz Crystal ◽  
Vibrational Mode ◽  
Time Of Flight ◽  
Pulsed Laser ◽  
Wavelength Dependence ◽  
Optical Absorption Coefficient ◽  
Maximum Value ◽  
High Laser

ABSTRACTTime-of-flight (TOF) experiments were performed to study the desorption of trans-l,2-dichlorocyclohexane molecules from molecular films condensed on a quartz-crystal microbalance at 77 K. The wavelength dependence of the desorption signal was investigated by resonant excitation of the internal vibrational mode of the molecule in the 10 μm region with a pulsed line-tunable TEA CO2 laser. The TOF temperatures showed the same spectral dependence as the optical absorption coefficient. The TOF distributions were narrower than Maxwellian distributions for multilayer desorption yields and approached Maxwellian distributions for submonolayer desorption yields. A saturation behavior was found at high laser intensities, indicating that the kinetic energy of the desorbing molecules is limited to a maximum value.

scholarly journals Variant-Coherence Gaussian Sources

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 403
Author(s):  
Franco Gori ◽  
Massimo Santarsiero
Keyword(s):  
Spectral Density ◽  
Source Area ◽  
Spectral Densities ◽  
Differential Constraint ◽  
Modal Expansion ◽  
Shape Invariant ◽  
Degree Of Coherence ◽  
Cross Spectral Density ◽  
The Laplace Transform ◽  
Space Variant

The celebrated Gaussian Schell model source with its shift-invariant degree of coherence may be the basis for devising sources with space-variant properties in the spirit of structured coherence. Starting from superpositions of Gaussian Schell model sources, we present two classes of genuine cross-spectral densities whose degree of coherence varies across the source area. The first class is based on the use of the Laplace transform while the second deals with cross-spectral densities that are shape-invariant upon paraxial propagation. For the latter, we present a set of shape-invariant cross-spectral densities for which the modal expansion can be explicitly found. We finally solve the problem of ascertain whether an assigned cross-spectral density is shape-invariant by checking if it satisfies a simple differential constraint.

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