Propagation and scattering of waves in a strongly nonuniform nonabsorbing medium

1989 ◽  
Vol 32 (3) ◽  
pp. 234-239
Author(s):  
A. P. Yakimovich
Keyword(s):  
Nonabsorbing Medium

Milne's Problem for Thermal Neutrons in a Nonabsorbing Medium

1961 ◽  
Vol 11 (2) ◽  
pp. 116-120 ◽  
Author(s):  
R. Kladnik ◽  
I. Kuščer
Keyword(s):  
Thermal Neutrons ◽  
Nonabsorbing Medium

scholarly journals The Sensitivity of SeaWiFS Ocean Color Retrievals to Aerosol Amount and Type

2016 ◽  
Vol 33 (6) ◽  
pp. 1185-1209 ◽  
Author(s):  
Ralph A. Kahn ◽  
Andrew M. Sayer ◽  
Ziauddin Ahmad ◽  
Bryan A. Franz
Keyword(s):  
Ocean Color ◽  
Atmospheric Correction ◽  
Single Scattering ◽  
Medium Size ◽  
Wide Field ◽  
Anthropogenic Aerosols ◽  
Transport Pathways ◽  
Nonabsorbing Medium ◽  
Absorbing Aerosols ◽  
Aerosol Type

AbstractAs atmospheric reflectance dominates top-of-the-atmosphere radiance over ocean, atmospheric correction is a critical component of ocean color retrievals. This paper explores the operational Sea-viewing Wide Field-of-view Sensor (SeaWiFS) algorithm atmospheric correction with ~13 000 coincident surface-based aerosol measurements. Aerosol optical depth at 440 nm (AOD440) is overestimated for AOD below ~0.1–0.15 and is increasingly underestimated at higher AOD; also, single-scattering albedo (SSA) appears overestimated when the actual value <~0.96. AOD440 and its spectral slope tend to be overestimated preferentially for coarse-mode particles. Sensitivity analysis shows that changes in these factors lead to systematic differences in derived ocean water-leaving reflectance (Rrs) at 440 nm. The standard SeaWiFS algorithm compensates for AOD anomalies in the presence of nonabsorbing, medium-size-dominated aerosols. However, at low AOD and with absorbing aerosols, in situ observations and previous case studies demonstrate that retrieved Rrs is sensitive to spectral AOD and possibly also SSA anomalies. Stratifying the dataset by aerosol-type proxies shows the dependence of the AOD anomaly and resulting Rrs patterns on aerosol type, though the correlation with the SSA anomaly is too subtle to be quantified with these data. Retrieved chlorophyll-a concentrations (Chl) are affected in a complex way by Rrs differences, and these effects occur preferentially at high and low Chl values. Absorbing aerosol effects are likely to be most important over biologically productive waters near coasts and along major aerosol transport pathways. These results suggest that future ocean color spacecraft missions aiming to cover the range of naturally occurring and anthropogenic aerosols, especially at wavelengths shorter than 440 nm, will require better aerosol amount and type constraints.

scholarly journals Successive uptapering and stationary self-trapped propagation of a laser beam in a saturating nonlinear medium

1995 ◽  
Vol 13 (4) ◽  
pp. 559-567 ◽  
Author(s):  
Sarang Medhekar ◽  
Rajkamal ◽  
S. Konar
Keyword(s):  
Steady State ◽  
Laser Beam ◽  
Nonlinear Medium ◽  
Propagation Distance ◽  
Gain Medium ◽  
Gaussian Laser Beam ◽  
Steady State Analysis ◽  
Material Gain ◽  
Nonabsorbing Medium ◽  
State Analysis

A steady-state analysis of Gaussian laser beam in a nonlinear medium has been presented. It is shown that an oscillatory self-guided beam (whose width is oscillating with the propagation distance) in a saturable nonlinear medium can be uptapered by material gain. Moreover, the present investigation suggests that under certain conditions it is possible to obtain a stationary self-guided beam (planar wavefront) in a nonabsorbing medium from an initially oscillatory (nonplanar wavefront) beam in a nonabsorbing medium by uptapering it in a gain medium.

Enhancing the Index of Refraction in a Nonabsorbing Medium: Phaseonium Versus a Mixture of Two-Level Atoms

1993 ◽  
pp. 73-80
Author(s):  
M. O. Scully ◽  
T. W. Hänsch ◽  
M. Fleischhauer ◽  
C. H. Keitel ◽  
Shi-Yao Zhu
Keyword(s):  
Index Of Refraction ◽  
Nonabsorbing Medium
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