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  • 1
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    SIMULTANEOUS MODE‐LOCKING AND SECOND‐HARMONIC GENERATION BY THE SAME NONLINEAR CRYSTAL (1969)
    American Institute of Physics
    Details
    Publication Date: 1969-07-01
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Removal of a Glowing Spot from an Image Tube Using Laser Radiation (1972)
    American Institute of Physics
    Details
    Publication Date: 1972-12-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Infrared upconversion as a means of seeing in the dark (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A new approach to seeing in the dark is described which is based on the principles of nonlinear optics employing a crystal such as lithium iodate. A nonlinear optical device capable of producing photons at higher frequencies from lower-frequency incident light is shown to upconvert infrared light directly into visible light. The major advantages of the infrared upconversion process is that it permits the infrared signal to be detected by photon-counting devices presently available for the visible spectral region, and that it can provide sensitivity to infrared radiation without the need for cryogenic cooling of the detector used. Early works on infrared upconversion are reviewed. The development of applications is discussed as to astronomical spectroscopy and infrared image upconversion involving either angular or positional resolution elements. The demonstration of infrared upconversion in rectangular waveguides of single-crystal GaAs by Anderson et al. (1971) indicates future possibilities in upconversion by the use of integrated optics devices.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Sciences Center Newsletter; 9; May 1975
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Astronomical demonstration of an infrared upconverter (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An upconverter has been used to convert infrared photons from astronomical sources to higher frequency quanta that were detected with a pulse-counting photomultiplier photometer. It is pointed out that these observations represent the first successful astronomical demonstration of infrared upconversion. Upconversion is carried out in an optically nonlinear medium, which in the upconverter described is a lithium iodate crystal. A 0.6943-micrometer high peak power ruby laser pump was developed for the demonstration.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nature; 249; June 14
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Simultaneous mode-locking and second-harmonic generation by the same nonlinear crystal. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Simultaneous mode locking of Nd YAG laser and intracavity second harmonic generation in high temperature Li niobate or BaNa niobate
    Keywords: MASERS
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Development, applications, and future of infrared upconversion (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Infrared upconversion is a technique that converts linearly polarized infrared photons to photons of higher frequency. The technique can be applied advantageously to the detection of IR radiation because the upconverted signal can be detected by photon-counting devices available for the visible spectral region. In addition, unlike presently available IR detectors, an upconversion device can provide sensitivity to IR radiation without the need for cryogenic cooling. Infrared upconversion was first demonstrated in 1961. By 1974, approximately 100% quantum conversion efficiency and a bandwidth of 1.81 microns had been attained. Photometric detection of IR radiation from various astronomical objects had also been demonstrated. Research is presently under way on the application of upconversion to astronomical spectroscopy and to imaging. The major drawback to the upconversion technique is the sheer bulk of the apparatus involved. It is anticipated that this problem can be overcome by applying the developing technology of integrated optics.
    Keywords: OPTICS
    Type: Earth and Extraterrestrial Sciences; 2; June 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    High-quantum-efficiency infrared up-conversion. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Experimental study in which 100% conversion of infrared photons into visible photons was achieved through three wave interactions in a nonlinear medium. The first experimental evidence of overconversion is presented, and the classical theory of up-conversion in the high-conversion-efficiency region is confirmed. A laser pump light feedback technique is described that promises to make the process practical with modestly powerful pump lasers and less than perfect nonlinear crystals. The nonlinear medium used was a LiIO3 crystal that cannot be 90-deg phase-matched. The 'walk off' that resulted helped make possible the attainment of 100% conversion efficiency.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Physics Letters; 23; Sept. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Removal of a glowing spot from an image tube using laser radiation. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A troublesome problem with the Kron electronograph has been the presence of a white glowing spot on the glass wall of the tube adjacent to the focus electrode. The procedure followed to eliminate the spot was to operate in the dark and apply voltage only to the focused electrode. Ruby laser radiation was unfocused, and its position was shifted on the electrode between laser shots until an effect was observed. This technique for removing the glowing spot should be applicable to other electronic image tubes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 43; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Optical contact approach to laser rod support. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The successful application of an optical contact is described between a ruby laser rod that has no mechanical support and a sapphire rod. The contact is found to be durable in the environmental conditions associated with a high-power pulsed ruby laser. The described contact technique makes it possible to construct a laser oscillator using an ellipsoidal pump mirror that does not employ dielectric coatings in the cavity. Another advantage consists in that the ruby laser is not shaded from the pump light by mounting jigs at its ends.
    Keywords: MASERS
    Type: Applied Optics; 11; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Upconversion of broadband infrared spectra (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An experimental device successfully upconverts IR radiation in the 3.2-5.0 micron wavelength range simultaneously to visible light at 0.80-0.88 microns, while preserving frequency coding and is thus applicable to IR spectroscopy. The 1.8-micron bandwidth of IR radiation that is upconverted without temperature or phase match tuning is the largest yet reported. The over-all system quantum efficiency of the upconverter/spectrometer system is 0.01% and could be improved to 0.4%.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 17; Apr. 15
    Format: text
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    NASA TECHNICAL REPORTS
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