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  • Articles  (11,574)
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  • 1965-1969  (9,656)
  • 1945-1949  (1,918)
  • Electrical Engineering, Measurement and Control Technology  (11,574)
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  • Articles  (11,574)
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  • 1
    Electronic Resource
    Electronic Resource
    A 10-stage digital light beam deflector (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 21-23 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A 10-stage digital light beam deflector is described using Kerr cell polarisation switches and calcite birefringent prisms. Optimum design criteria are derived with respect to resolution and drive voltage. The final device had an overall transmission of 91% and could be switched from one direction to another in 0.2μsec.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476787
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  • 2
    Electronic Resource
    Electronic Resource
    The electro-optic effect in proustite (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 9-12 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The low-frequency unclamped electro-optic coefficients of proustite have been measured at an optical wavelength of 0.6328μm. The results show thatr 22 is comparable to that of lithium niobate,r 13 andr 33 are considerably lower. The maximum theoretical value is calculated at 10.8×10−12 m/V about three times the largest measured coefficient value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476785
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  • 3
    Electronic Resource
    Electronic Resource
    Passive mode-locking of flashlamp pumped Rhodamine dye-lasers (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 69-74 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A simple dye-laser system is described in which Rhodamine dyes are pumped by a co-axial linear air flashlamp in a cylindrical elliptical pumping reflector. Output pulses lasting up to 1.5μsec and containing up to 250 mJ energy, have been successfully mode-locked to produce 100% modulated pulse trains. Employing a diffraction grating as cavity reflector to tune the laser frequency, in each case, for maximum absorption by the same Q-switching dye, successful mode-locking has been achieved with both Rhodamine B and Rhodamine 6G. Time resolved emission spectra have been recorded with an image tube streak camera and the effect of resonant reflectors has been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418099
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  • 4
    Electronic Resource
    Electronic Resource
    Spatial filters for pattern detection and image enhancement (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 128-133 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A theory of spatial frequency domain filters is presented from the standpoint of leastsquare linear estimation. The general expression of this filter is obtained with few assumptions, thus allowing considerable flexibility in its application. Noise common to pictorial information usually can be described as a mutually exclusive process, whereas much of the available signal processing theory assumes additive noise. Types of pictorial noise discussed in this paper include the background of signal patterns, pattern obscurity, and image modulation due to the recording process. It is shown that the additive noise assumption is valid under certain conditions. The general filter is described in terms of spatial frequency estimates which are conveniently expanded for particular applications. A detection filter for determinative patterns is obtained and compared to the matched filter. A filter is derived to restore patterns degraded by noise and a linear distortion filter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419271
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  • 5
    Electronic Resource
    Electronic Resource
    A method for producing controllable double pulses from a Q-switched laser (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 134-137 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A method is described for producing two controllable pulses from a Q-switched solid state laser, the time separation of the pulses being variable from about 30 nsec to a few microseconds. The technique involves Q-switching the system with a time variant loss which has two steps, the application of the first step only partially depleting the population inversion. The method has been demonstrated with an electro-optically Q-switched Nd:CaWO4 laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419272
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  • 6
    Electronic Resource
    Electronic Resource
    Approximate photon-counting distribution for thermal light (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 152-154 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419276
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  • 7
    Electronic Resource
    Electronic Resource
    Further results on the range gating technique: Visibility in sea water (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 155-159 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419277
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  • 8
    Electronic Resource
    Electronic Resource
    Periodic resonant reflectors with chosen peak reflectivity (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 151-152 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419275
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  • 9
    Electronic Resource
    Electronic Resource
    Editorial statement (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. i 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476783
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  • 10
    Electronic Resource
    Electronic Resource
    Phase-matching for optical up-conversion with maximum angular aperture — theory and practice (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 25-28 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An equation of quadratic form is derived relating the phase mismatchΔk=¦k sum −k pump −k slgnl ¦ in an optical sum-frequency generation process to the angle ψ between the pump and signal wave vectors. For a special value ofk pump a solution ofΔk=0 exists having degenerate roots and consequently a single value of ψ. Because of this it is possible to choose a non-collinear phasematching situation for an optical up-converter which tolerates a much larger signal beam divergence than if a collinear-beam interaction were chosen. The case of up-conversion of 10.6μm radiation to the visible, using ruby-laser pumped proustite was chosen as an example for experimental study. Under tangential phase-matching conditions an angular acceptance angle of the infra-red beam of 300 mrad was achieved for a crystal 0.45 cm long.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476788
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