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  • 1
    Electronic Resource
    Electronic Resource
    Separation of a single cell by red-laser manipulation (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2671-2673 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A single cell of yeast was separated from a bulk sample of yeast without causing damage to the cell. A focused red-laser light beam was used for trapping and transporting the cell. A specially designed microchannel separator played an essential role in the success of the separation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125114
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial coherence of laser light propagating in an optical fibre (1982)
    Springer
    Optical and quantum electronics 14 (1982), S. 515-523 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The modulus of the complex degree of spatial coherence at the exit face of an optical fibre is determined for a quasi-monochromatic, spatially coherent source. It is found that the contribution of the cross-terms between many modes to the formulus of pointwise correlation is negligible for a highly multimode fibre in which even and odd modes are equally excited, although care must be taken when even or odd modes only are selectively excited in the waveguide. Experimental results obtained by using a Koesters prism in the wavefront reversing interferometer are also presented for a graded-index multimode fibre and a quasi-single mode fibre. Modal contents of the propagating field in the optical fibre can be successfully determined, provided that the coherence time of a quasi-monochromatic source and the path difference of the wavefront reversing system are knowna priori.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00610307
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  • 3
    Electronic Resource
    Electronic Resource
    Optical processing with twin ultrasonic light modulators (1971)
    Springer
    Optical and quantum electronics 3 (1971), S. 119-125 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A collinear optical heterodyne system with twin ultrasonic light modulators (ULM) is considered within the Raman-Nath regime. The zeroth order beam of light emerging from the first ULM enters the second ULM and splits into the diffraction spectrum with the frequencies shifted by integral multiples of the driving sound frequency. For the purpose of photomixing, the positive or negative first order beam in this spectrum can be superposed on the first order beam of light from the first ULM which passes through the second ULM without deflection, and comes to the same location as the other. Experimental verification is successfully carried out by producing a beat signal of light with a difference frequency between two sound frequencies. It is demonstrated analytically that a convolution or correlation function between two time varying signals can be obtained, according to whether the beat signal of light has the sum or difference frequency of the two driving sound frequencies. The sum or difference frequency can be generated as one of the sound waves proceeds in the same or reverse direction as the other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419434
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  • 4
    Electronic Resource
    Electronic Resource
    Is the Van Cittert-Zernike Theorem Applicable to Spatially Incoherent Broadband Spectral Source? (1998)
    Springer
    Optical review 5 (1998), S. 27-29 
    Details
    ISSN: 1349-9432
    Keywords: mutual intensity ; cross-spectral density ; spatially incoherent broadband spectral source ; propagation law ; Van Cittert-Zernike theorem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper deals with the propagation law of mutual intensity and cross-spectral density of the light emitted from an extended broadband spectral source that is spatially incoherent. The mutual intensity of light does not obey the same mathematical formalism as the Van Cittert-Zernike theorem applicable to quasi-monochromatic light, although the cross-spectral density of light does in the propagation zone of the Fresnel diffraction region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-998-0027-7
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Spatial Coherence and Dispersive Diffraction on a Change in Optical Spectrum (1995)
    Springer
    Optical review 2 (1995), S. 6-12 
    Details
    ISSN: 1349-9432
    Keywords: spectral change ; polychromatic spatially partially coherent source ; spatial coherence control ; super-luminescent diode as a spectral source ; red and blue shift of the spectrum ; theory and experiments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes a change in optical spectrum on propagation in free space for a particular class of spatially partially coherent fields emanating from a polychromatic secondary source. A rectangular opening aperture in an opaque screen, illuminated with an extended incoherent polychromatic primary source, works as the secondary source. The spectral change is explored in detail theoretically and experimentally in association with spatial coherence in the secondary source as well as dispersive diffraction by the secondary source. The peak shift of the spectrum is associated with the coherence area for characterizing the secondary source. The peak shift becomes maximum if the secondary source is spatially coherent, but no shift occurs if the secondary source is spatially incoherent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-995-0006-1
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  • 6
    Electronic Resource
    Electronic Resource
    White-Light Frequency-Domain Interferometry Using a Köosters Prism (1998)
    Springer
    Optical review 5 (1998), S. 21-26 
    Details
    ISSN: 1349-9432
    Keywords: frequency-domain interferometry ; white-light source ; Kösters prism ; carrier frequency ; longterm stability ; absorption and dispersion measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An optical frequency-domain interferometer incorporating a Kösters prism is constructed to offer an excellent instrument for making a stable precision-measurement of material absorption and dispersion. The working stability is well retained over a long-term operation of 15 h, but the spectral resolution is limited to the resolving power of the spectrum analyzer used. The absorption and dispersion measurements are demonstrated by use of two samples of a BK-7 glass plate and rhodamine in ethanol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-998-0021-0
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  • 7
    Electronic Resource
    Electronic Resource
    Laser speckle movements related to platinum-electrolyte interface (1978)
    Springer
    Applied physics 15 (1978), S. 303-306 
    Details
    ISSN: 1432-0630
    Keywords: 73 ; 42.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Speckle movements are discovered in the investigation of a platinum-hydrogen system in 1N HClO4. The speckle pattern of the light scattered off by a platinum-electrode surface is displaced laterally as a whole as a function of the electrode potential. The derivative of the photocurrent profile corresponding to the speckle displacement has four peaks in the so-called hydrogen region of the electrode potential. Three of these peaks have a certain correlation with the electrochemical aging effect which is attributed to hydrogen adsorbed on to the electrode surface. The feasibility of using this effect for in situ investigations of the metal-solution interface is pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896112
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  • 8
    Electronic Resource
    Electronic Resource
    Optical Heterodyne Impulse-Response Measurement of Lithium Tantalate Phase Modulator Driven by Wideband Frequency Signal (1994)
    Springer
    Optical review 1 (1994), S. 65-67 
    Details
    ISSN: 1349-9432
    Keywords: wideband optical heterodyne interferometry ; impulse response ; transfer function ; correlation processing ; lithium tantalate phase modulator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, we describe a novel optical heterodyne interferometer for characterizing phase modulation systems including a lithium tantalate phase modulator. A wideband random signal is imposed on the modulator so that the resultant beat photocurrent is modulated in phase at random. The cross-power spectrum of the fluctuating phase with the wideband random signal driving the modulator is computed to give the transfer function and the impulse response of the phase modulation system. The frequency and time response of the phase modulation are measured up to 15 MHz in a practical experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-994-0065-8
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  • 9
    Electronic Resource
    Electronic Resource
    Spectrum Invariance for a Particular Class of Optical Fields Propagated in Far Zone (1995)
    Springer
    Optical review 2 (1995), S. 347-351 
    Details
    ISSN: 1349-9432
    Keywords: spectrum invariance on propagation ; inhomogeneous optical fields ; particular complex degree of spectral coherence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes invariance of the normalized optical spectrum for a particular class of optical fields propagated in the far zone from a secondary, spatially, partially coherent source. The optical field across the secondary planar source is inhomogeneous to give the complex degree of spectral coherence such that μ = h(αω(ρ1–ρ2))exp(iɛω(ρ12–ρ22)), where α, ɛ are constants, ω is optical frequency, and ρ1, ρ2 denote two points in the secondary source. This expression for μ is the same as obtained in the Fresnel zone from a primary, spatially incoherent source. The invariance law does not hold for the spectrum of the light propagated from the primary source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-995-0347-9
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  • 10
    Electronic Resource
    Electronic Resource
    Highly Sensitive and Widely Dynamic Fiber-Coiled Deformation Sensor Immune from External Disturbances (1997)
    Springer
    Optical review 4 (1997), S. 342-345 
    Details
    ISSN: 1349-9432
    Keywords: double Mach-Zehnder interferometry ; optical heterodyne detection ; immunity from environmental disturbances ; polarization maintaining single-mode fiber ; fiber-coil deformation sensor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper describes a double fiber-coiled interferometric deformation sensor fabricated using paired polarization maintaining single-mode fibers. A change in bending-induced birefringence plays a fundamental role in the sensor performance as the fiber-coil is being deformed across its cross-section. Differential optical heterodyne detection processes allow us to implement two-mode operations; one is widely dynamic operation and the other highly sensitive operation around a target region. The deformation sensitivity for one-turn fiber-coil is 2.5 deg/mm for the widely dynamic operation, whereas 9.5X10 deg/mm for the highly sensitive operation. The double fiber-coiled deformation sensor can eliminate external, undesirable temperature disturbances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-997-0342-4
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