Vibrationally Enhanced Infrared Four Wave Mixing PDF Download
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Author: James Patrick Hamilton
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Book Description
Author: James Patrick Hamilton
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Book Description
Author: Peter Conway Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 368
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Author: Nicholas Joseph Condon
Publisher:
ISBN:
Category :
Languages : en
Pages : 342
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Author: Paul Murray Donaldson
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Paul Murray Donaldson
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: James Holliday Newton
Publisher:
ISBN:
Category : Infrared image converters
Languages : en
Pages : 154
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Author: Kent Albert Meyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Author: Jeremy James Pigeon
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Book Description
The nonlinear optics of gigawatt power, 10 i m, 3 and 200 ps long pulses propagating in gases and semiconductors has been studied experimentally and numerically. In this work, the development of a high-repetition rate, picosecond, CO2 laser system has enabled experiments using peak intensities in the range of 1 - 10 GW/cm2, approximately one thousand times greater than previous nonlinear optics experiments in the long-wave infrared (LWIR) spectral region. The first measurements of the nonlinear refractive index of the atomic and molecular gases Kr, Xe, N2, O2 and the air at a wavelength near 10 i m were accomplished by studying the four-wave mixing (FWM) of dual-wavelength, 200 ps CO2 laser pulses. These measurements indicate that the nonlinearities of the diatomic molecules N2, O2 and the air are dominated by the molecular contribution to the nonlinear refractive index. Supercontinuum (SC) generation covering the infrared spectral range, from 2 - 20 i m, was realized by propagating 3 ps, 10 i m pulses in an approximately 7 cm long, Cr-doped GaAs crystal. Temporal measurements of the SC radiation show that pulse splitting accompanies the generation of such broadband light in GaAs. The propagation of 3 ps, 10 i m pulses in GaAs was studied numerically by solving the Generalized Nonlinear Schri dinger Equation (GNLSE). These simulations, combined with analytic estimates, were used to determine that stimulated Raman scattering combined with a modulational instability caused by the propagation of intense LWIR radiation in the negative group velocity dispersion region of GaAs are responsible for the SC generation process. The multiple FWM of a 106 GHz, 200 ps CO2 laser beat-wave propagating in GaAs was used to generate a broadband FWM spectrum that was compressed by the negative group velocity dispersion of GaAs and NaCl crystals to form trains of high-power, picosecond pulses at a wavelength near 10 i m. Experimental FWM spectra obtained using 165 and 882 GHz beat-waves revealed an unexpected and rapid decrease in the FWM yield that was not predicted by the GNLSE model that accounts for third-order nonlinearities alone. These results suggest that the effective nonlinear refractive index of GaAs, having formidable second- and third-order susceptibilities, may be altered by quadratic nonlinearities.
Author: Minhaeng Cho
Publisher: Springer
ISBN: 9811397538
Category : Science
Languages : en
Pages : 404
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Book Description
This book will fulfill the needs of time-domain spectroscopists who wish to deepen their understanding of both the theoretical and experimental features of this cutting-edge spectroscopy technique. Coherent Multidimensional Spectroscopy (CMDS) is a state-of-the-art technique with applications in a variety of subjects like chemistry, molecular physics, biochemistry, biophysics, and material science. Due to dramatic advancements of ultrafast laser technologies, diverse multidimensional spectroscopic methods utilizing combinations of THz, IR, visible, UV, and X-ray radiation sources have been developed and used to study real time dynamics of small molecules in solutions, proteins and nucleic acids in condensed phases and membranes, single and multiple excitons in functional materials like semiconductors, quantum dots, and solar cells, photo-excited states in light-harvesting complexes, ions in battery electrolytes, electronic and conformational changes in charge or proton transfer systems, and excess electrons and protons in water and biological systems.
Author: KoHse-HoingHaus
Publisher: Taylor & Francis US
ISBN: 9781560329381
Category : Technology & Engineering
Languages : en
Pages : 748
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Book Description
The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measurement schemes; and engineers, who know combustion systems and processes. This book assists in providing guidance for the planning of combustion experiments, in judging research strategies and in conceiving new ideas for combustion research. It provides a snapshot of the available diagnostic methods and thier typical applications from the perspective of leading experts in the field.
