Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes

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The authors present recent results of broadband femotosecond (fs) transient absorption (TA) and broadband nanosecond (ns) optical limiting (OL) studies of C{sub 60} and derivatized C{sub 60}. Improvements in measurement techniques for fs TA spectra provide sensitivity to 10{sup {minus}5} in differential transmission, allowing detailed comparison of excited-state spectra with established energy level diagrams, as well as comparison of the ratio of triplet to singlet excited-state absorption cross sections from TA spectra with those obtained by modeling time transients at different wavelengths. For derivatized fullerenes, which provide enhanced solubility and a ground-state absorption extended into the infrared compared with C{sub ... continued below

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13 p.

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Kohlman, R.; Klimov, V. & Shi, X. October 1, 1997.

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The authors present recent results of broadband femotosecond (fs) transient absorption (TA) and broadband nanosecond (ns) optical limiting (OL) studies of C{sub 60} and derivatized C{sub 60}. Improvements in measurement techniques for fs TA spectra provide sensitivity to 10{sup {minus}5} in differential transmission, allowing detailed comparison of excited-state spectra with established energy level diagrams, as well as comparison of the ratio of triplet to singlet excited-state absorption cross sections from TA spectra with those obtained by modeling time transients at different wavelengths. For derivatized fullerenes, which provide enhanced solubility and a ground-state absorption extended into the infrared compared with C{sub 60} there is no spectral region where the triplet absorption cross section dominates the singlet as strongly as demonstrating broadband limiting in all 6, 6 mono-adducts and neat C{sub 60}. The authors report new approaches to processing sol-gel encapsulated fullerenes to improve the OL performance of solid-state materials to approach the response of solution limiters.

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13 p.

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OSTI as DE98000244

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  • Annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 27 Jul - 1 Aug 1997

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  • Other: DE98000244
  • Report No.: LA-UR--97-3520
  • Report No.: CONF-970706--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 538027
  • Archival Resource Key: ark:/67531/metadc693749

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 23, 2016, 2 p.m.

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Kohlman, R.; Klimov, V. & Shi, X. Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes, article, October 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc693749/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.