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  • 1
    Electronic Resource
    Electronic Resource
    Effects of free-carrier absorption on time-resolved pump-probe two-photon absorption in semi-insulating semiconductors (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1075-1079 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Free-carrier absorption induced by picosecond pump excitation is investigated for the time-resolved pump-probe nonlinear transmission process in semi-insulating semiconductors. Time-resolved nonlinear absorption measurements of 1.064 μm, 29 ps pulses with semi-insulating undoped GaAs and Ga-doped CdTe are performed. Because of very small linear absorption at 1.064 μm for Ga-doped CdTe, the effect of the nonlinear free-carrier absorption is found to be noticeable. A theoretical analysis is also made to understand the role of the free-carrier absorption and the linear absorption saturation at large positive time delays of the probe. From the fitting procedure by the theory free-carrier absorption coefficients as well as two-photon absorption coefficients for the two crystals are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351782
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pulsewidth dependence of time-resolved two-photon absorption with picosecond pump–probe excitation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2102-2105 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulsewidth dependence of time-resolved two-photon absorption with picosecond pump–probe excitation is investigated. It is shown theoretically that the time-resolved probe transmittance change by two-photon absorption almost follows a temporal autocorrelation of the pump and probe pulses. Time-resolved two-photon absorption measurements of 1.064 μm, 29 ps pulses with semi-insulating undoped GaAs are also performed. The comparison of the experimental results with second harmonic generation autocorrelation measurements confirms the theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351131
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Broadband absorption changes and sensitization of near-infrared photorefractivity induced by ultraviolet light in LiNbO3:Mg (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4177-4180 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We observe ultraviolet-light-induced absorption changes in spectral regions from the near-ultraviolet to the near-infrared in as-grown LiNbO3:Mg. Such a broad light-induced absorption band is unstable at room temperature and decays nonmonoexponentially in the dark with a time constant on the order of tens of seconds. We attribute the appearance of the broadband light-induced absorption to the creation of the intermediate state O− in which holes excited from deep defect centers are trapped at O2− sites near cation vacancies. It is also found that near-infrared photorefractive sensitivities increase by several orders of magnitude by pre-exposing the crystal to incoherent ultraviolet light. These properties may be useful for an application of LiNbO3:Mg to nonvolatile two-color holography. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456958
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  • 4
    Electronic Resource
    Electronic Resource
    Real-time image subtraction with the use of wave polarization and phase conjugation (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 425-427 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate, using a double-phase conjugate mirror, image subtraction, addition, and intensity inversion by two orthogonally polarized image-bearing phase conjugate waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99431
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  • 5
    Electronic Resource
    Electronic Resource
    Crystal-temperature dependence of picosecond two-beam coupling gains in semi-insulating semiconductors (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5077-5081 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temperature dependences of time-resolved picosecond beam coupling gains and losses in semi-insulating undoped GaAs and CdTe:Ga are investigated experimentally at a wavelength of 1.064 μm. In the temperature range of 283–363 K a weak temperature dependence of the free-carrier energy transfer gain is observed at high fluence excitation, while photorefractive beam coupling gains and nonlinear absorption losses are found to exhibit no clear temperature dependence. A numerical simulation of the dynamics of photoexcited carriers and space-charge fields is also performed in order to examine the experimental results. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366381
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  • 6
    Electronic Resource
    Electronic Resource
    Picosecond cross-polarization beam coupling in semi-insulating Ga-doped CdTe at high fluences (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 914-916 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate the high-contrast polarization-rotation switching in semi-insulating CdTe:Ga using a 30-ps pump and probe pulses at a wavelength of 1.064 μm. It is found that the maximum switching contrast in the photorefractive cross-polarization beam coupling configuration is about eight times higher for CdTe:Ga compared to undoped GaAs at fluences above 10 mJ/cm2. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113595
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  • 7
    Electronic Resource
    Electronic Resource
    Nonvolatile two-color holography in indium-doped lithium niobate (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3508-3510 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate nonvolatile two-color holography in an as-grown congruent LiNbO3:In crystal of 2.2 mm thickness. We show that the nonvolatile two-color holographic performance of the crystal is significantly improved as compared with that of other congruent LiNbO3 crystals reported so far. The figure of merit M/# and the two-color recording sensitivity S are measured to be ∼0.04 and ∼3.5×10−4 cm/J, respectively, with a writing intensity of 4 W/cm2 at 780 nm and a gating intensity of 1.15 W/cm2 at 488 nm. These values are comparable to those of unreduced near-stoichiometric LiNbO3 crystals under similar recording conditions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329166
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  • 8
    Electronic Resource
    Electronic Resource
    Self-enhanced diffraction properties of a nominally undoped barium titanate crystal with a thermally fixed grating (2000)
    Springer
    Optical and quantum electronics 32 (2000), S. 349-365 
    Details
    ISSN: 1572-817X
    Keywords: barium titanate ; beam coupling ; diffraction efficiency ; photorefractive effect ; thermal fixing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We describe recent studies on diffraction properties of a photorefractive barium titanate crystal having a thermally fixed grating. Buildup dynamics of diffracted signals are measured to analyze the contributions of ionic and re-created photocarrier (hole) gratings to the temperature-dependent diffraction efficiency in self-enhanced readout. An activation energy of mobile ions as nonphotoactive secondary carriers for fixing volume holograms is determined holographically. This value is compared with that of hydrogen ions estimated from polarization-dependent infrared absorption spectra in order to indentify the fixing species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007096304983
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