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PERIODIC NONLINEAR REFRACTIVE INDEX OF CARBON DISULFIDE VAPORS
Title
PERIODIC NONLINEAR REFRACTIVE INDEX OF CARBON DISULFIDE VAPORS.
Creator
Strunk, Evelyn, Hagan, David, University of Central Florida
Abstract / Description
The purpose of this thesis is to explore the nonlinear refractive index of carbon disulfide vapors as opposed to its liquid form. With CS2 vapors, the vapors are less dense so they will rotate longer than liquid CS2 because there are less intermolecular interactions. The electric field of the beam causes the molecules to align with the electric field and applies a torque to the molecules. After this excitation, the molecules continue rotating. The rotations change the index of refraction of...
Show moreThe purpose of this thesis is to explore the nonlinear refractive index of carbon disulfide vapors as opposed to its liquid form. With CS2 vapors, the vapors are less dense so they will rotate longer than liquid CS2 because there are less intermolecular interactions. The electric field of the beam causes the molecules to align with the electric field and applies a torque to the molecules. After this excitation, the molecules continue rotating. The rotations change the index of refraction of the material. Continuous rotation of the molecules causes the index of refraction to be periodic which means the molecules are going through multiple revivals. I will analyze this periodic nonlinear index of refraction. However, some problems occurred while the experiment was being done as well as some issues of measuring CS2 because of white light continuum generation in the cell walls. To avoid these issues we measured the air in the lab and were able to observe the periodic change of index of refraction for O2 and N2 .
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Date Issued
2014
Identifier
CFH0004619, ucf:45270
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFH0004619
CHARACTERIZATION OF THE NONLINEAR REFRACTIVE INDEX OF CARBONDISULFIDE OVER AN EXTENDED SPECTRAL AND TEMPORAL RANGE
Title
CHARACTERIZATION OF THE NONLINEAR REFRACTIVE INDEX OF CARBONDISULFIDE OVER AN EXTENDED SPECTRAL AND TEMPORAL RANGE.
Creator
Seidel, Marcus, Van Stryland, Eric, University of Central Florida
Abstract / Description
The intensity dependent refractive index change of a medium is frequently described in terms of the product n2xI where n2 is the nonlinear refractive index and I the light intensity. The nonlinear refractive index is often treated as constant which is a reasonable assumption if the light interacts only with bound electrons. In the case of carbon disulfide (CS2) however, nuclear motions contribute to n2. These motions occur on the sub picosecond time scale and thus become especially relevant...
Show moreThe intensity dependent refractive index change of a medium is frequently described in terms of the product n2xI where n2 is the nonlinear refractive index and I the light intensity. The nonlinear refractive index is often treated as constant which is a reasonable assumption if the light interacts only with bound electrons. In the case of carbon disulfide (CS2) however, nuclear motions contribute to n2. These motions occur on the sub picosecond time scale and thus become especially relevant for ultrashort laser pulses. The neat liquid CS2 is studied because it exhibits a large nonlinear refractive index in comparison to other liquids. Therefore, it is employed in optical switching, optical limiting, and beam filamentation applications. This thesis presents effective n2 values for Gaussian shaped linearly polarized pulses with central wavelengths of 700nm. A theoretical model describing the time evolution of the material response is applied to distinguish between the instantaneous electronic, the ultrafast nuclear and the slow nuclear origins of the nonlinear refractive index. Moreover, the tensor nature of the material response function is studied by means of circularly polarized light. The relative magnitudes of bound electronic and nuclear contributions to n2 are experimentally determined. Eventually, the dispersion of the instantaneous electronic response is measured in the spectral range between 411nm and 1064nm.
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Date Issued
2011
Identifier
CFE0004052, ucf:49141
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0004052