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  • 1
    Electronic Resource
    Electronic Resource
    Effects of energy transfer on quantum efficiency of YAG:Nd (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3792-3797 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the energy transfer parameters deduced from the study on nonexponential luminescence decay of the 4F3/2 level of Nd3+ in YAG at room temperature, it is shown that up to 1.5 at. % Nd, the relative quantum efficiency is reduced by an amount of 18.2C, C being the relative (to Y3+) Nd concentration. It is pointed out that about 20% of this reduction is due to a very effective quenching mechanism inside the nearest-neighbor Nd-ion pairs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344042
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  • 2
    Electronic Resource
    Electronic Resource
    Stabilizing a laser beam's focal point inside a liquid-helium cryostat (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 325-330 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The focal point of a laser beam inside a liquid-helium cryostat has been spatially stabilized. Both passive and active stabilization techniques are employed. The position of the focal point is maintained to submicrometer dimensions in the plane transverse to the beam path. The instabilities along the beam propagation direction are reduced to the order of 10 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144456
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  • 3
    Electronic Resource
    Electronic Resource
    A precision drive for a Michelson wavemeter (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1459-1462 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a high precision Michelson wavemeter using a novel drive mechanism. The moving arm of the Michelson interferometer is actively stabilized, producing a stable fringe rate that can be electronically multiplied by a factor of 100. A special gating circuit eliminates the turning points from the drive motion yielding continuous measurements. This circuitry also allows for wavelength measurements of nonstabilized continuous wave lasers. A resolution of ±20 MHz is achieved with a measurement cycle of less than 6 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144063
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  • 4
    Electronic Resource
    Electronic Resource
    Increasing the frequency stability of single-frequency lasers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2475-2481 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed an improved technique to increase the stability of single-frequency lasers by employing a scanning Fabry–Perot interferometer and a stabilized helium neon laser. Our instrument surpasses earlier devices in several key areas. The laser frequency can now be stabilized while scanned across its inherent single-frequency tuning range. The frequency stability is long term with an increased frequency correction rate of nearly 500 Hz. The laser frequency can be scanned repeatedly with a repetition accuracy equal to the frequency stability. Also, the electronics permit the laser frequency to be swept externally while synchronized with other instruments. Our stabilizer reduced the frequency drift of a commercial ring dye laser to ±1 MHz relative to the reference laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143906
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  • 5
    Electronic Resource
    Electronic Resource
    Phase-locked optical choppers (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 342-345 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a circuit for maintaining a fixed phase relationship between two optical choppers. The basis of this circuit employs a phase-locked loop using both proportional and integral terms in the feedback control voltage. Using additional circuitry, the electronics can compensate for drifts in the phase as well as frequency of both choppers in the frequency range from 200 Hz to 3 kHz. These phased optical choppers have been used to block background light simultaneous with a chopped cw laser in experiments that measure long lived fluorescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144254
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  • 6
    Electronic Resource
    Electronic Resource
    Ballistic propagation of large wave vector magnons in magnetically ordered materials (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5470-5473 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present evidence of ballistic transport of energy by high-energy, large wave vector magnons in the antiferromagnet MnF2. Nonequilibrium magnons are created by heat pulses or by selective laser excitation throughout the Brillouin zone, using the magnon sideband or far-infrared (FIR) two-magnon absorptions. The ballistic magnon signal is extracted from the total observed signal and used to calculate the magnon velocity as a function of magnon energy. The results compare favorably with theory. Implications of our results to various types of magnetically ordered lattices are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342351
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  • 7
    Electronic Resource
    Electronic Resource
    Green phosphorescence of CaAl2O4:Tb3+,Ce3+ through persistence energy transfer (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1535-1537 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystal CaAl2O4 fibers doped with Ce3+ or Tb3+ or double doped with Tb3+ and Ce3+ were prepared by the laser-heated pedestal-growth method. Ce3+-doped CaAl2O4 was found to have persistent phosphorescence in the blue violet lasting more than 10 h, while Tb3+-doped CaAl2O4 showed only a weak afterglow. However, long persistent green phosphorescence from Tb3+ was observed in the doubly doped fiber, CaAl2O4:Tb3+,Ce3+. It was found that the enhanced green phosphorescence from Tb3+ is due to persistence energy transfer from the thermally released electrons to Ce3+ followed by energy transfer to Tb3+. The finding suggests a promising approach for controlling the color of persistent phosphors. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456955
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  • 8
    Electronic Resource
    Electronic Resource
    Saturation of 1.064 μm absorption in Cr,Ca:Y3Al5O12 crystals (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2958-2960 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Saturation absorption experiments are conducted on the title compound at 1.064 μm with laser light propagating along both the [001] and [111] crystallographic axes. Rotation of the crystals about these axes during the experiments reveals that the transmission of the polarized 1.064 μm radiation is highly anisotropic in the saturation regime. The details of the anisotropy and saturation curves are explained using a simple model of subsets of optical centers along with a relevant set of rate equations. The ground and excited-state absorption cross sections at 1.064 μm are calculated to be σgs=5.7(±2)×10−18 cm2 and σes=8(±2)×10−19 cm2, respectively, and the optimum crystallographic orientation for utilization in optical devices is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108030
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  • 9
    Electronic Resource
    Electronic Resource
    Luminescence efficiency of cerium doped insulators: The role of electron transfer processes (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3300-3302 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Insulating host materials doped with trivalent cerium show quantum efficiencies of the Ce3+ emission ranging from zero to unity. Comparing optical and photoelectrical properties of a very efficient scintillator material (Lu2(SiO4)O:Ce) to those of cerium doped oxides with quenched emission, the radical differences for these materials are demonstrated to originate from the location of the cerium energy levels with respect to the host conduction band. Photoionization and subsequent nonradiative relaxation processes responsible for the luminescence quenching are discussed in a donor–acceptor model for the impurity ion and a rule for luminescence efficiency is derived, applicable to a variety of phosphor and scintillator materials. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117286
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  • 10
    Electronic Resource
    Electronic Resource
    Raman scattering from sapphire fibers (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 785-788 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An index matching technique for Raman scattering from sapphire fibers is presented; the technique is shown to be effective in suppressing the stray laser background and leads to an improved signal-to-noise ratio of the Raman signal. Red shifts of phonon frequencies for both A1g and Eg symmetry modes were observed under tensile uniaxial stress parallel to the c axis. The unexpected shifts of the Eg modes may be attributable to effects due to restricted dimensions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250201206
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