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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Author: James Patrick Hamilton
Publisher:
ISBN:
Category :
Languages : en
Pages : 714
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Author: Peter Conway Chen
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ISBN:
Category :
Languages : en
Pages : 368
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Author: Nicholas Joseph Condon
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ISBN:
Category :
Languages : en
Pages : 342
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Author: James Holliday Newton
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Category : Infrared image converters
Languages : en
Pages : 154
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Author: Paul Murray Donaldson
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Category :
Languages : en
Pages :
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Author: Paul Murray Donaldson
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Category :
Languages : en
Pages : 0
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Author: Kent Albert Meyer
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Category :
Languages : en
Pages : 352
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Author: Jeremy James Pigeon
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ISBN:
Category :
Languages : en
Pages : 156
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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:
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Category :
Languages : en
Pages :
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A method and apparatus for achieving large susceptibilities and long interaction lengths in the generation of new wavelengths in the infrared spectral region. A process of resonantly enhanced four-wave mixing is employed, utilizing existing laser sources, such as the CO.sub. 2 laser, to irradiate a gaseous media. The gaseous media, comprising NH.sub. 3, CH.sub. 3 F, D.sub. 2, HCl, HF, CO, and H.sub. 2 or some combination thereof, are of particular interest since they are capable of providing high repetition rate operation at high flux densities where crystal damage problems become a limitation.
Author: David Erik Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 598
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