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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of nonlinear refractive index coefficients of NH3 gas for transversely excited atmospheric CO2 laser lines (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 276-280 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The positive and negative nonlinear refractive index coefficients of NH3 gas are determined for the nine transversely excited atmospheric CO2 laser lines by observing the far-field spatial distortions of the output Gaussian beam passed through the nonlinear cell. The expression of the distorted field, which is a series expansion of Gaussian beams and derived by D. Weaire et al. [Opt. Lett. 4, 331 (1979)], is used. By taking the first two terms of the series, the experimental results are computer analyzed to obtain the nonlinear refractive index coefficient. Among the nine lines observed, one line 9R(16) has shown self-defocusing and eight lines the self-focusing effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342537
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of deposition angle on perpendicular anisotropy and internal stress in evaporated TbFeCo films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6803-6805 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of deposition angle on perpendicular magnetic anisotropy and internal stress in thermally evaporated amorphous TbFeCo thin films are investigated. We have found that the perpendicular anisotropy and the internal stress depend strongly on the deposition angle, and above a threshold value (30°), the perpendicular anisotropy disappears and the in-plane anisotropy appears. The measurement of internal stress, which is due to the substrate constraint, reveals that the compressive stress is the major contribution to the perpendicular anisotropy. The measurements of Kerr hysteresis loops in the polar and longitudinal directions show that, as the deposition angle increases, the polar Kerr hysteresis loop deteriorates, while the longitudinal Kerr hysteresis loop becomes prominent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342017
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  • 3
    Electronic Resource
    Electronic Resource
    Amplified spontaneous emission and superradiant pulse from the flash-pumped atomic iodine system (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 285-287 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A superradiant and amplified spontaneous transition pulse is obtained from an iodine photodissociation laser amplifier which uses i-C3F7I as an active molecule and is pumped with a flashlamp (full width at half maximum=3 μs). We have observed a sharp leading pulse of superradiance whose rise time is less than 50 ns, and the amplified spontaneous emission follows the superradiance during the pumping flash. By measuring the population inversion density in the active medium of the amplifier, we have obtained the threshold condition for the superradiance to take place. Also, the buildup time and peak intensity of the pulse are measured as a function of the flashlamp input energy. By placing a reflecting mirror at a varying distance (from 173 to 673 cm) behind the amplifier, we have found a periodic intensity fluctuation in the superradiance; the period (Δt) depends linearly on the distance (d), i.e., Δt=2d/c, where c is the light velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340290
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  • 4
    Electronic Resource
    Electronic Resource
    Laser optoacoustic measurement of homogeneous linewidth and pump saturation intensity in a CH3I molecule (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3959-3962 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optoacoustic measurement of the absorption line shape is carried out for the determination of the homogeneous linewidths and the saturation intensities of a CH3I molecule for a 10-μm P(32) CO2 laser line. By fitting the numerically calculated Voigt function to the experimentally obtained absorption line shape, we find two absorption lines separated by 90 MHz. The measurement of the pressure dependence of the homogeneous linewidth at pressures lower than 0.8 Torr shows that the rate of increase of the homogeneous linewidth is not linear but larger at lower pressure than that at higher pressure. The natural linewidth of 12 MHz is obtained by extrapolating the experimentally obtained linewidth curve toward zero pressure, and also the pump saturation intensities at the line centers of the CH3I absorption line and CO2 laser line are found to be 1.0 and 2.5 W/cm2, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335570
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  • 5
    Electronic Resource
    Electronic Resource
    Inter-miniband optical absorption in a modulation-doped AlxGa1−xAs/GaAs superlattice (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6617-6624 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Theoretical calculations of the optical absorption between the conduction subbands in a modulation-doped AlxGa1−xAs-GaAs superlattice are presented. The electronic subband structures, including both the couplings between different quantum wells and the band bending due to screening effects, are calculated self-consistently by solving simultaneously the Schrödinger and the Poisson equation. Linear intersubband absorption in the superlattice is then calculated and the absorption spectra show interesting line shapes which reflect the joint density of states between different subbands. The dependence of the absorption (energy-band width, resonant absorption energy, and magnitude of peak absorption coefficient) on device parameters such as doping concentration, well width, barrier width, and aluminum mole fraction in the barrier, which are useful for the design of infrared detectors, is also investigated. These theoretical results are also compared with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348875
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  • 6
    Electronic Resource
    Electronic Resource
    Small acousto-optic modulation for active mode locking in the iodine photodissociation laser and the effect of supplementary saturable absorber (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 208-210 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Active, passive, and active–passive mode locking of the iodine photodissociation laser are investigated. The peak-to-background ratio (PBR) of the acousto-optically mode-locked pulse is 85% for rf power of 5 W. Passive mode locking using BDN dye gives PBR of 75% and has inferior reproducibility. The active–passive mode locking using the two methods simultaneously is useful for the pressure broadened iodine laser line and gives a PBR of 91%. In this case the rf power required for complete mode locking is calculated to be 7 W which is much less than the required power of 11 W in using active mode locking alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138331
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  • 7
    Electronic Resource
    Electronic Resource
    Measurement of the amplified spontaneous emission loss in an iodine photodissociation laser amplifier (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3926-3928 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The directional amplified spontaneous emission (ASE) along the laser tube of an iodine photodissociation laser (IPL) amplifier is measured and the experimental results are compared with the one-dimensional ASE theory. Also, we have measured the loss of the stored energy in the IPL amplifier due to the omnidirectional ASE. The loss is found to be 13.5% for the present amplifier when the laser medium i-C3F7I is 72 Torr and no argon buffer gas is added. But by adding the argon buffer gas to 210 Torr, it is reduced to 4.2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335615
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  • 8
    Electronic Resource
    Electronic Resource
    Thermo-optic and electro-optic tuning sensitivities of the second-harmonic generation in KH2PO4 crystal measured by diverging beam technique (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 2647-2649 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Second-harmonic wave is generated in type-1 and type-2 cuts of KH2PO4 crystal by using a diverging Nd+3–glass laser beam. Angular full width at half-maximum of the conversion efficiencies are measured by recording the diverging output on photographic emulsion. Thermo-optic and electro-optic tuning sensitivities for the two types of crystal cuts are measured accurately from the recorded diverging output beam. The measured thermo-optic tuning sensitivities are 0.005 46±4×10−5 deg/°C for type-1 and 0.0143±4×10−4 deg/°C for type-2, and the measured electro-optic tuning sensitivities are 0.004 37±3×10−5 deg/kV cm for type-1, and zero for type-2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335403
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  • 9
    Electronic Resource
    Electronic Resource
    Polarimetric determination of the ratio between the constituent phase conjugate signals in degenerate four-wave mixing (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2194-2197 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have derived the polarization dependent coupling constants for transmission and reflection gratings in degenerate four-wave mixing, measured phase-conjugate signals for various polarization conditions, and determined the relative contribution of the two gratings to the signal. The results obtained with cryptocyanine dissolved in methanol as the nonlinear medium show that the signal from transmission grating is 1.53–2.14 times larger than that from a reflection grating depending on the angle between the wave vectors of the forward pump beam and the probe beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339521
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  • 10
    Electronic Resource
    Electronic Resource
    Dye laser frequency locking to the hyperfine structure (3S1/2, F=2−3P1/2, F=2) of sodium D1 line by using polarization spectroscopy (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 417-419 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The frequency of a single-mode dye laser is locked to a hyperfine structure of the sodium D1 line without modulating the laser frequency. The frequency locking method uses the error signal from a dispersion curve generated from the polarization spectroscopic output. The servo loop provides a frequency fluctuation less than ±0.3 MHz for more than 30 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99428
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