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  • 1990-1994  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Second-harmonic generation from chiral surfaces (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 8193-8199 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a theory of second-harmonic generation from chiral surfaces including contributions of electric and magnetic dipole transitions to the surface nonlinearity. The nonlinear polarization and magnetization of the surface as well as the second-harmonic fields that are radiated in the reflected and transmitted directions are expressed in terms of the six possible bilinear combinations of the components of the electric field of the fundamental beam. For the case in which the polarization of the fundamental beam is controlled by means of a quarter-wave plate between p-polarized linear and left- and right-hand circular, the second-harmonic fields can be expanded in terms of only three different functions of the rotation angle of the wave plate. The process exhibits nonlinear optical activity, i.e., it responds differently to the two circular polarizations of the fundamental beam if the phases of certain expansion coefficients are different. The theory is used to explain the results of a recent experiment and excellent agreement is found. The results suggest that in the experiment the largest components of the susceptibility tensors that include magnetic contributions were of the order of ∼10% of those of the electric dipole-allowed susceptibility tensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468203
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  • 2
    Electronic Resource
    Electronic Resource
    Parametric light scattering (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 1745-1747 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We observe a nonlinear light-scattering process in which incident photons at two different frequencies give rise to scattered radiation at the sum frequency in an isotropic medium. We utilize this process to determine the ratio β322/β333 of the dominant components of the molecular hyperpolarizability tensor β for para-nitroaniline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467732
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hyper-Rayleigh scattering in solution with tunable femtosecond continuous-wave laser source (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2190-2194 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Hyper-Rayleigh scattering has been developed as a generally applicable technique for the determination of the first hyperpolarizability β of a wide class of molecules [Clays and Persoons, Rev. Sci. Instrum. 63, 3285 (1992)]. In this article, we show that it is possible to replace the low repetition rate, nanosecond pulse, Q-switched laser source and fast gated electronics by a self-mode-locked, femtosecond pulse, broadly tunable continuous-wave laser and phase-sensitive detection. This results in a faster and much simpler measurement procedure. The accuracy of the femtosecond hyper-Rayleigh scattering set-up was checked by measuring the first hyperpolarizability β of the octopolar molecule crystal violet in methanol [(450±100)×10−30 esu at 800 nm]. The sensitivity of the instrument allows concentration-dependence studies, down to the pure solvent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144725
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  • 4
    Electronic Resource
    Electronic Resource
    Hyper-Rayleigh scattering in solution (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3285-3289 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The experimental setup for the implementation of a new technique to determine the hyperpolarizability of nonlinear optical molecules in solution is presented. The new technique, hyper-Rayleigh scattering in solution [K. Clays and A. Persoons, Phys. Rev. Lett. 66, 2980 (1991)], has the advantage over the electric-field-induced second-harmonic generation technique that the dipole moment μ and the second hyperpolarizability γ do not have to be independently determined to obtain the first hyperpolarizability β. No electric field is needed to lower the intrinsic symmetry of the isotropic solution, leading to a simpler cell design and a simpler local field factor. The internal reference method, when applicable, completely eliminates the local field factor. With the technique presented, values of the first hyperpolarizability β of 23×10−30 esu for para-nitroaniline (PNA), 105×10−30 esu for 4-methoxy-4'-nitrostilbene (MONS), and 95×10−30 esu for 4-hydroxy-4'-nitrostilbene (HONS) dissolved in chloroform have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142538
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlinear Optical Activity and Biomolecular Chirality (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 9203-9205 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00099a040
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  • 6
    Electronic Resource
    Electronic Resource
    A fluorescence lifetime study of virginiamycin S using multifrequency phase fluorometry (1991)
    s.l. : American Chemical Society
    Biochemistry 30 (1991), S. 7271-7276 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00243a032
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  • 7
    Electronic Resource
    Electronic Resource
    Distinction of two-photon absorption from other nonlinear loss mechanisms by phase-conjugate interferometry (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 280-282 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that phase-conjugate interferometry is a measuring technique for third-order optical nonlinearities that can distinguish two-photon absorption from other nonlinear loss mechanisms. For the case of 3,3'-diethyloxadicarbocyanine iodide at 1064 nm, the nonlinear loss is dominated by linear absorption from the two-photon excited state. We observe a highly nonlinear absorption process in solutions of 4-methoxy-4'-nitrostilbene at 532 nm and show that it is due to a more complicated loss mechanism. This mechanism could have applications in optical limiting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112375
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of frequency doubling polymeric materials, 2Part 1: cf. ref.(9). Second-order nonlinear optical properties of poled chromophore-functionalized polystyrenes (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 3057-3061 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and frequency doubling properties of nonlinear optical chromophore functionalized polystyrene with 4-nitro- or 4-cyano-4'-hydroxyazobenzene, or 2-[2-(4-hydroxyphenyl-ethenyl)]-3,5-dinitrothiophene are reported. The polymers with longer spacer length of the side chain chromophore show higher X(2) values, because of a better alignment under poling conditions. Values as high as 23,8 · 10-9esu at 1064 nm can be achieved. With a stronger acceptor group (3,5-dinitronthiophene) a value of 22 · 10-9esu was achieved for a chromophore content which was even 4 times smaller.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021931212
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of nonlinear optical polymers functionalized with 4-amino-4′-cyanostilbene and -azobenzene dyes. Second harmonic generation in corona-poled thin films (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 1733-1744 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and susceptibilities χ(2)33 and χ(2)31 to two series of polymethacrylates functionalized with 4-dialkylamino-4′-cyanoazobenzene and 4-dialkylamino-4′-cyanostilbene dyes are reported. The monomeric dyes were homo- and copolymerized with methyl methacrylate in various ratios, to produce polymers useful for nonlinear optical (NLO) applications. The second-order nonlinear optical properties of corona-poled aligned polymers were evaluated by second harmonic generation measurements. The χ(2)33 results for the azo-dye polymers are in the range of 25-324 · 10-9 esu, and for the stilbene-dye polymers in the range of 42-57 · 10-9 esu, depending on the functionalisation degree of the copolymers. The poled films do not show a significant decay in the second harmonic signal after four months.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940620
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of frequency doubling polymeric materials, 1. Second-order nonlinear optical properties of poled chromophore-functionalized polymethacrylates (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 3045-3055 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and second harmonic coeficients d33, d 31 and the susceptibilities χ(2) are reported of three series of (co)polymethacrylates that possess 4-(2,2-dicyanovinyl)- or 4-(2-cyano-2-methoxycarbonyl)vinyl-N,N-dialkylaniline (P1 and P2), 4-(2,2-dicyanovinyl)- or 4-(2-cyano-2-methoxycarbonyl)vinyl-(-piperidino)benzene (P5 and P6) and 4-(2,2-dicyano)- or 4-(2-cyano-2-methoxycarbonyl)vinyl-1-alkoxybenzene (P3 and P4) dyesSystem. names of the monomers see Exptl. part.. The second-order nonlinear optical properties of corona-poled aligned polymer films were evaluated by second harmonic generation measurements. The χ(2)zzz values for the P1 and P2 polymers vary from 58 to 318, respectively 32 to 106 · 10-9 esu, for P3 and P4 from 7,6 to 19, respectively 4,4 to 7,4 · 10 -9 esu and for P5 and P6 from 219 to 42,8 respectively 28,1 to 8,1 · 10-9 esu, depending on the dye chromophore concentration incorporated in the polymer structure.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021931211
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