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Low-Frequency Vibrational Motions of Polystyrene in Carbon Tetrachloride: Comparison with Model Monomer and Dependence on Concentration and Molecular Weight

Studies on the molecular dynamics of polymers in solution often use longer time scales due to the size of the macromolecules being studied. To fully elucidate the complete dynamics and interactions of polymers in solution, however, it is necessary to also study the ultrafast (sub-picosecond) dynamics as well. In ...

by Brad Sohnlein

Tags: Ti:Sapphire, spectroscopy, ultrafast spectroscopy

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Femtosecond Laser Spectroscopy, Autocorrelation, and Second Harmonic Generation: An Experiment for Undergraduate Students

With the increase in integrated photonics careers, it is essential that students in undergraduate institutions gain experience with equipment, techniques, and ideas used in the field.  In this paper, an upper level undergraduate lab is designed utilizing a KMLabs by Brad Sohnlein

Tags: Ti:Sapphire, Dispersion, spectroscopy, ultrafast spectroscopy, Teaching Lab

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Field Ion Emission in an Atom Probe Microscope Triggered by Femtosecond-Pulsed Coherent Extreme Ultraviolet Light

3D pulsed laser atom probe tomography (APT)  is an atomic scale materials characterization and 3D imaging method utilizing ultrafast pulses to induce photon assisted field ion evaporation in certain materials. Currently, modern APT measurements employ coherent, pulsed near ultraviolet (NUV) light to induce ...

by Brad Sohnlein

Tags: High Harmonic, XUUS, Ti:Sapphire, HHG, EUV, extreme ultraviolet source, materials characterization, spectroscopy, ultrafast spectroscopy, Atom Probe Tomography

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High conversion efficiency of an optical parametric amplifier pumped by 1 kHz Ti:Sapphire laser pulses for tunable high-harmonic generation

The maximum photon energy achievable in high harmonic generation is proportional to the square of the excitation wavelength. Due to this scaling, extreme ultraviolet (XUV) light generation requires intense infrared pulses as the excitation wavelength. Converting ultrafast pulses from Ti:sapphire to longer wavelengths through optical parametric ...

by Daisy Raymondson

Tags: High Harmonic, Ti:Sapphire, EUV, soft X-ray, OPA

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