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  • 1
    Electronic Resource
    Electronic Resource
    A simple submicron confocal microscope with a fiberoptic output (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4161-4164 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a simple design of a reflection-type confocal microscope with a multimode graded-index fiber output. Due to the use of an apertureless confocal arrangement, a high-aperture focusing objective and a large-core graded-index multimode fiber for signal detection, a regime of high-output power is achieved that provides high resolving power and submicron spatial resolution. The graded-index multimode fiber ensures an efficient launching and maintenance of high laser powers, a high sensitivity to spatial displacements of the focusing backreflectance emission, and a low mode noise and signal fluctuations. At axial scanning of the test object, a submicron resolution of 0.4 μm is obtained. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322589
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  • 2
    Electronic Resource
    Electronic Resource
    All-fiber-optic sensor for liquid level measurement (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2551-2554 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An experimental realization of a simple all-fiber-optic sensor for liquid level measurement is demonstrated. It is an intensity-modulated on–off switching sensor whose operating principle is based on the frustrated-total-internal-reflection effect caused by the refractive-index change of the surrounding medium. The basic optical element in the scheme is a sensing single fiber which serves simultaneously to transmit both the forward laser emission to the investigated medium and the useful signal backreflected from the fiber tip that is the sensing element. In order to achieve a maximum sensor sensitivity, we use a specially shaped fiber tip in two profile variants: angled and retroreflecting. The experimental investigations of the sensor properties and the results obtained at the pure-water level measurement confirm the sensor potential in liquid level determination with a high accuracy, exceeding 10 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149792
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and Optical Properties of Rare-Earth–Aluminum Oxide Glasses (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Single-phase glasses containing 37.5 mol% Y2O3, 7 mol% La2O3, and 1 mol% Pr, Ho, Nd, Er, Sm, Tm, Eu, or Yb oxide substituted for part of the Y2O3 were synthesized by containerless melting. The spectral transmission and absorption cross sections of the glasses were determined at wavelengths from 360 to 3300 nm. The electronic transitions were broadened compared with results obtained in a crystalline yttrium aluminum garnet (YAG) host. The infrared transmission of the host glass extended to 6000 nm. The optical and physicochemical properties of these glasses are well suited for optical device applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00266.x
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  • 4
    Electronic Resource
    Electronic Resource
    Uncoated hollow taper as a simple optical funnel for laser delivery (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3840-3843 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We propose a simple uncoated hollow taper as a novel technique for laser radiation delivery and laser-to-optical waveguide coupling over a wide spectral range. The principle of operation of the hollow taper is based on the effect of light at grazing incidence. An uncoated Pyrex-glass hollow taper is used for direct launching, without any intermediate focusing elements, of laser radiation including from powerful lasers into the taper. Because of the high reflectance coefficients close to 100% at the light grazing incidence, we obtain high laser-to-taper coupling efficiency exceeding 90% for a He–Ne laser (λ=632.8 nm) and 80% for a Er:YAG laser (λ=2.94 μm). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150042
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  • 5
    Electronic Resource
    Electronic Resource
    Grazing-incidence-based hollow taper for infrared laser-to-fiber coupling (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2921-2923 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based on grazing incidence, a simple uncoated hollow glass taper as an alternative technique for efficient infrared laser-to-fiber coupling is presented. Because of the mutual action of the direct parallel laser excitation, the mode-coupling process, and mode filtering, the hollow taper serves as a mode converter that transforms the highly multimode intensity distribution of the input laser emission into a high-quality smooth profile at the taper output. When an uncoated Pyrex-glass hollow taper is used for direct launching, without any intermediate focusing elements, of a powerful infrared Er:YAG laser emission (λ=2.94 μm), we obtain high laser-to-taper (81%), taper-to-fiber (96%), and total laser-to-fiber (78%) coupling efficiencies. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123966
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  • 6
    Electronic Resource
    Electronic Resource
    Ultraviolet and blue discretely tunable double-pass fiber Raman laser (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 3200-3202 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The experimental realization of a new ultraviolet and blue tunable fiber Raman laser, based on a simple double-pass fiber laser arrangement with Littrow-prism-tuned emission, is demonstrated. The third harmonic of a Q-switched Nd:YAG laser (λp=355 nm) is used to pump a 100-μm-core-diam multimode silica UV optical fiber. As a result of a single pass of the pump laser emission through the fiber, an initial multicascade Raman Stokes spectrum that contains up to 21 Stokes orders in the spectral range 360–527 nm at 1.9 GW/cm2 input pump intensity is generated. By using the double-pass regime of the fiber Raman laser and multimode fibers with different lengths, a discretely tunable generation corresponding to the various Stokes orders over the multicascade Stokes spectrum in the ultraviolet and blue regions (360–493 nm) is obtained. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119126
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  • 7
    Electronic Resource
    Electronic Resource
    A widely tunable (0.54–1.01 μm) double-pass fiber Raman laser (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1846-1848 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a novel and simple double-pass fiber Raman laser in the visible and near-IR regions, based on the use of a fiberoptic autocollimation technique with Littrow-prism-tuned emission. When the Raman medium is a 40-m-long 68-μm-core-diam graded-index multimode fiber with powerful (above 100 kW pulse power coupled into the fiber) nanosecond pumping using the second harmonic of a Nd:YAG laser (λp=532 nm), we obtain widely tunable generation in both the visible and near- IR. By using the double-pass fiber Raman laser with various lengths of the multimode fiber, continuously tunable generation over a wide spectral range (0.54–1.01 μm) is obtained. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117453
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