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IEEE Journal of Quantum Electronics

Issue 10 • October 1987

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
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  • Editorial announcement

    Publication Year: 1987, Page(s): 1670
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  • Announcing a special issue of the IEEE journal of quantum electronics on solid-state lasers

    Publication Year: 1987, Page(s): 1671
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  • Announcing a special issue of the IEEE journal of quantum electronics on nonlinear optical phase conjugation

    Publication Year: 1987, Page(s): 1672
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  • Minimum-mode-size low-loss Ti: LiNbO3channel waveguides for efficient modulator operation at 1.3 µm

    Publication Year: 1987, Page(s):1673 - 1679
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2292 KB)

    Efficient operation of Ti-diffused LiNbO3modulators and switches requires small, tightly guiding channel waveguide modes which effectively overlap the applied modulating field. This in turn requires Ti:LiNbO3channel waveguides with minimum mode size. The small-mode-size waveguides are obtained inz-cut crystals by optimizing the fabrication parameters to achieve max... View full abstract»

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  • Eigenmode analysis of symmetric parallel waveguide couplers

    Publication Year: 1987, Page(s):1689 - 1700
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2880 KB)

    An analysis of a laterally symmetric parallel waveguide structure has been carried out by using symmetric and antisymmetric eigenmodes in the coupled mode equations. As opposed to modes of each individual guide, eigenmodes are orthogonal and therefore comply with coupled mode formalism. Of particular interest has been the popular configurationZ-cut LiNbO3with Wave propagation... View full abstract»

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  • Introduction to the special issue on lasers in biology and medicine

    Publication Year: 1987, Page(s):1701 - 1702
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  • Mechanical and thermal parameters in pulsed laser cutting of tissue

    Publication Year: 1987, Page(s):1787 - 1793
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2127 KB)

    We investigate the physical processes in tissue cutting resulting from absorption of pulsed 10.6 μm radiation impact in the flux density range1.3 cdot 10^{4} - 6 cdot 10^{6}W/cm2. A purely thermodynamical explanation of the cutting process is tested experimentally. It is shown that for pulse durations longer than a fraction of a μs, the temperature and pressure valu... View full abstract»

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  • Silver halide optical fibers for medical applications

    Publication Year: 1987, Page(s):1827 - 1835
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4030 KB)

    Optical fibers fabricated from silver halide crystals (AgClxBr1-x) are transparent in the far infrared (3-15 mum). They can transmit CO2laser radiation with power densities greater than3 times 10^{4}W/cm2in the CW mode or short pulses with power densities on the order of5 times 10^{6}W/cm2. A laser catheter sys... View full abstract»

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  • Femtosecond laser-tissue interactions: Retinal injury studies

    Publication Year: 1987, Page(s):1836 - 1844
    Cited by:  Papers (37)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4673 KB)

    We report the first study of laser-tissue interaction in the femtosecond time regime. Retinal damage thresholds and mechanisms produced by exposure to high-intensity femtosecond laser pulses were investigated in chinchilla grey rabbits. Exposures were performed using single laser pulses of 80 fs duration at 625 nm. ED50injury thresholds of 0.75 and 4.5 μJ were measured using fluore... View full abstract»

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  • [Back cover]

    Publication Year: 1987, Page(s): 0
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  • Photorefractive material response to short pulse illuminations

    Publication Year: 1987, Page(s):1680 - 1688
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2440 KB)

    Photoconduction and hologram recording in a Bi12SiO20single crystal are studied from both theoretical and experimental points of view in the case of short pulse excitations. An approach taking into account two kinds of acceptor centers explains the charge transport processes in the case of both pulsed and continuous illuminations. A nanosecond temporal resolution allows us to... View full abstract»

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  • Ultrasensitive time-resolved polarized fluorescence spectroscopy as a tool in biology and medicine

    Publication Year: 1987, Page(s):1812 - 1820
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2920 KB)

    Fluorescence induced by mode-locked and synchronously pumped continuous wave lasers and detected by time-resolved single-photon counting is a sensitive and dynamic property to be utilized in a wide variety of biological and medical applications. Examples are given to illustrate the potency of the technique. View full abstract»

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  • Autofluorescence maps of atherosclerotic human arteries--A new technique in medical imaging

    Publication Year: 1987, Page(s):1794 - 1797
    Cited by:  Papers (48)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4208 KB)

    A new medical imaging technique for arterial walls based on laser-induced autoflnorescence spectroscopy is reported. The internal surface of isolated arteries with or without atherosclerosis is irradiated with an argon ion laser (458 nm) and the peak intensity of the excited autofluorescence spectrum is related to the composition of the arterial wall. The higher autofluorescence intensity in the r... View full abstract»

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  • Excimer laser angioplasty: Tissue ablation, arterial response, and fiber optic delivery

    Publication Year: 1987, Page(s):1772 - 1782
    Cited by:  Papers (59)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4664 KB)

    The results of recent work directed towards the application of excimer lasers to angioplasty are presented. Several laser-tissue interactions are examined, including the effect of the XeCl laser optical pulse duration (7-300 ns) on the threshold fluence for ablation of arterial wall and on the quality of the cut in human postmortem artery, the potential for altering the ablation threshold fluence ... View full abstract»

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  • Free-electron lasers and their application to biomedicine

    Publication Year: 1987, Page(s):1739 - 1750
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4664 KB)

    The application of free-electron lasers (FEL's) to biology and medicine has recently become an area of intensive activity. Because of this interest, there is a need for discussion of FEL's in the context of applications. In this paper, the operating characteristics of FEL's which are relevant to biomedical applications are reviewed. Assuming present-day FEL technology, the tradeoffs in FEL operati... View full abstract»

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  • Current status of cardiovascular laser therapy, 1987

    Publication Year: 1987, Page(s):1756 - 1771
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7800 KB)

    Percutaneous laser angioplasty has now become a clinical reality, consisting chiefly of applications of thermal angioplasty in conjunction with balloon angioplasty for the recanalization of peripheral vascular obstructions. In conjunction with this development, various aspects of laser-tissue interactions, fiber optic transmission, and delivery catheter design pertinent to the cardiovascular syste... View full abstract»

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  • Different lasers for angioplasty: Thermooptical comparison

    Publication Year: 1987, Page(s):1751 - 1755
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1656 KB)

    The quantitative estimates of various laser angioplasty conditions have been made. The thermal model used predicts the existence of and values for the thresholds for the tissue destruction by both the CW and pulsed laser radiation. These estimates agree with the known experimental data. The minimal thermal injury of surrounding tissue is obtained for the ablation mode which can be realized by a pu... View full abstract»

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  • Photobiological fundamentals of low-power laser therapy

    Publication Year: 1987, Page(s):1703 - 1717
    Cited by:  Papers (225)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4752 KB)

    Quantitative studies of the action of low-power visible monochromatic light on various cells (E. coli, yeasts, HeLa) were performed to find irradiation conditions (wavelength, dose, intensity) conducive to vital activity stimulation. The action spectra of visible light on DNA and RNA synthesis in HeLa cells have maxima near 404, 620, 680, 760, and 830 nm. Growth simulation of E. coli is at a maxim... View full abstract»

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  • Development and application of three-dimensional light distribution model for laser irradiated tissue

    Publication Year: 1987, Page(s):1721 - 1733
    Cited by:  Papers (68)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4024 KB)

    A three-dimensional model for estimating light distribution in laser irradiated tissue is presented. Multiple scattering and absorption of the laser beam are modeled using seven fluxes. One-, two-, and three-dimensional solutions are discussed and light distributions computed from the seven flux model are compared to those computed with the diffusion approximation. Methods for obtaining the phase ... View full abstract»

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  • A study of the three-dimensional distribution of light (632.8 nm) in tissue

    Publication Year: 1987, Page(s):1734 - 1738
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2032 KB)

    Effective application of photodynamic therapy requires that light dose to tissue be accurately calculated. Special fiber optic detectors have been constructed, and experimental methods developed, for determining three-dimensional flux patterns of red light instilled into tissue. These methods utilize the insertion and movement of the detecting fibers along fixed coordinates within tissue, and the ... View full abstract»

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  • Pulsed photothermal radiometry of human artery

    Publication Year: 1987, Page(s):1821 - 1826
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1800 KB)

    Pulsed photothermal radiometry (PPTR) has been used to measure, in vitro, the optical attenuation coefficients of normal and diseased human artery at four wavelengths (308, 351, 488, 532 nm) in the near UV and visible spectrum. The advantages and limitations of this noncontact method of measuring the optical properties of biological material, as well as other potential applications, are discussed. View full abstract»

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  • Multispectral system for medical fluorescence imaging

    Publication Year: 1987, Page(s):1798 - 1805
    Cited by:  Papers (74)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3040 KB)

    The principles of a powerful multicolor imaging system for tissue fluorescence diagnostics are discussed. Four individually spectrally filtered images are formed on a matrix detector by means of a split-mirror arrangement. The four images are processed in a computer, pixel by pixel, by means of mathematical operations, leading to an optimized contrast image, which enhances a selected feature. The ... View full abstract»

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  • Tumor localization and photosensitization by derivatives of hematoporphyrin: A review

    Publication Year: 1987, Page(s):1718 - 1720
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    A mixture of porphyrins derived from hematoporphyrin and termed HPD (hematoporphyrin derivative) has been useful for localization and therapy of neoplastic disease. The fluorescence and photosensitization of tissues which accumulate an HPD fraction have been examined by many research groups, and the clinical applications of these phenomena are now being explored. View full abstract»

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  • Preferential ablation of calcified arterial plaque with laser-induced plasmas

    Publication Year: 1987, Page(s):1783 - 1786
    Cited by:  Papers (36)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1424 KB)

    Laser endarterectomy, a promising new method of reopening stenotic or occluded arteries, has been limited by difficulties in ablating calcified plaque. This study demonstrates that pulsed, visible laser radiation (482 nm, 1 μs duration, 40-80 mJ/pulse) can ablate calcified plaque at intensities (50 MW/cm2) that are readily transmit, ted down flexible (320 μm diameter) optical ... View full abstract»

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Aims & Scope

The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Prof. Hon Ki Tsang
Chinese University of Hong Kong