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Quantum Electronics, IEEE Journal of

Issue 5 • Date May 1975

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Displaying Results 1 - 12 of 12
  • [Front cover and table of contents]

    Publication Year: 1975 , Page(s): 0
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    Freely Available from IEEE
  • "Buried modes" in planar media with nonmonotonically varying index of refraction

    Publication Year: 1975 , Page(s): 217 - 218
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    When guiding is due to a continuously varying, rather than discontinuous, index of refraction, n(z) , and n(z) peaks at some point inside the propagation medium, there may result "buried modes," i.e., modes whose exponential decay takes place inside the guiding medium rather than, as is usual, in an adjacent medium. The conditions for obtaining these modes are discussed in the Wentzel-Kramer-Brillouin (WKB) approximation and the mode equations given for both these modes and the usual ones for an illustrative case. View full abstract»

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  • Contributors

    Publication Year: 1975 , Page(s): 0
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    Freely Available from IEEE
  • New CW lines from a submillimeter waveguide laser

    Publication Year: 1975 , Page(s): 213 - 214
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    Sixty-one new CW laser lines with wavelengths between 0.1 and 1.5 mm have been observed with a waveguide laser optically pumped by a CO2laser. View full abstract»

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  • Controlled timewise redistribution of laser energy

    Publication Year: 1975 , Page(s): 181 - 185
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (936 KB)  

    An electronic feedback circuit is described which has been used in a Nd:glass high-power laser system for converting the spiky light emission into a smooth near-rectangular output of adjustable intensity and duration. The feedback circuit is also capable of converting the laser emission into a stroboscopic output of frequency of several hundreds of kilohertz or into a Q -switched high-intensity output. The attractive feature of the system is that the change from one type of laser operation into the other does not require any modification to the circuit, but only a simple readjustment of a few control knobs. The feedback system incorporates a high-current fast photodiode, a Pockels-cell shutter, and a pulser. The main innovation of the present electronic feedback circuit over previously proposed systems is the ability to set the Pockels cell at any point of its transmission curve. This feature will be demonstrated to be of decisive importance in smoothing out the laser emission and in converting the spiky light output into a series of periodic light pulses. View full abstract»

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  • On saturation mechanisms in PC He-Cd+lasers

    Publication Year: 1975 , Page(s): 218 - 220
    Cited by:  Papers (1)
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    The results of experimental studies on the saturation mechanisms in He-Cd laser discharge are presented. It is concluded that the saturation effects may be explained in terms of the influence of the discharge parameters on the helium triplet metastable density. View full abstract»

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  • High-resolution spectral measurements of SO2from 1176.0 to 1265.8 cm-1using a single PbSe laser with magnetic and current tuning

    Publication Year: 1975 , Page(s): 205 - 209
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    A single magnetic- and current-tuned PbSe diode laser was used to measure completely resolved spectra of SO2at low pressures over a major portion (1176.0-1265.8 cm-1) of the R branch of the ν1band for the first time. It is shown that the combination of magnetic and current tuning allows complete coverage of this 89.8-cm-1wide spectral region. Results generally show excellent agreement with theoretically generated spectra. Magnetic-tuning rates and, with magnetic field applied, current-tuning rates were observed to be significantly nonlinear. Precise spectroscopic data could be obtained with these nonlinearities taken into account. The current-tuning rate in zero magnetic field was essentially constant over the range investigated. View full abstract»

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  • Spatial hole burning and oligo-mode distance control in CW dye lasers

    Publication Year: 1975 , Page(s): 210 - 212
    Cited by:  Papers (4)
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    Spatial hole burning at the position of the dye cell is identified to be responsible for stable double-, triple-, and higher oligo-mode action in a narrow-band CW dye laser. This may be exploited systematically to control the mode distances by arranging the positions of both resonator end mirrors. A total output power up to over 100 mW is obtainable for double- or triple-mode action. Special conditions are described to obtain stable double-mode action with 1772-MHz mode spacing, as needed for simultaneous optical pumping of the two sodium hyperfine ground states. View full abstract»

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  • Theory of optical-gain measurements

    Publication Year: 1975 , Page(s): 190 - 197
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (832 KB)  

    The widely used technique for determining optical gain and absorption from single-pass, amplified spontaneous emission (ASE) is analyzed with particular attention given to active-volume saturation and three-dimensional effects. The results for homogeneously broadened media show that the population inversion and hence the gain in the active region is diminished by high levels of spontaneous and ASE. The externally measured gain is further reduced for large output collection apertures that admit incompletely amplified off-axis rays. Criteria are given for the excitation and detection geometries required to ensure accurate (∼10-percent) gain measurement. The simultaneous measurement of the equilibrium absorption coefficient can be made under less restrictive conditions. View full abstract»

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  • Stimulated-emission cross section and inversion lifetime in a three-atmosphere iodine photodissociation laser

    Publication Year: 1975 , Page(s): 215 - 217
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB)  

    An iodine photodissociation laser has been operated at three atmospheres by adding an inert gas to the laser medium. With three atmospheres of helium added a stimulated-emission cross section of 2 \times 10^{-19} cm2and an inversion half-life of 110 μs was observed. View full abstract»

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  • Fluctuations in mode-locking threshold due to statistics of spontaneous emission

    Publication Year: 1975 , Page(s): 186 - 190
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    A passively mode-locked Nd:YAG oscillator operating in TEM00mode is investigated theoretically and experimentally. It is shown that a mode-locking threshold well above the normal lasing threshold exists and that this second threshold is of a probabilistic nature. This means that mode locking at a given pump rate in the region of threshold occurs only with a certain probability due to the Gaussian statistics of spontaneous emission. Experiments agree qualitatively with theory. Furthermore, thermal effects in the liquid absorber are shown to play an important role in mode-locking systems; they introduce an additional time-dependent loss or gain, depending on the experimental setup. This can either lead to increase of mode-locking threshold or to the appearance of higher order transverse modes and possible damage of laser components. View full abstract»

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  • On the saturation effects and start jump of Gaussian modes in oscillators

    Publication Year: 1975 , Page(s): 198 - 204
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    The present paper deals with the interaction of a Gaussian mode with a homogeneous and an inhomogeneous laser transition. The interaction of the beam with the medium in a laser is treated by taking into account the spatial distribution of both radiation and gain. The intensity characteristics are very different from those obtained for a one-dimensional interaction of a plane wave with a saturating medium. In the presence of a small-signal gain profile the threshold condition requires much higher inversion densities along the optic axis than by ignoring this profile. For gas lasers, for instance, having a small-signal gain profile that is approximately described by a zero-order Bessel function, the threshold inversion density can be about 50 percent higher. For high-power systems the saturation of the medium by the Gaussian intensity distribution results in a considerable amount of radial radiation transport. For homogeneous transitions this amount is about equal to the stimulated emission and for inhomogeneous transitions it is about half of it, independent of the beamwidth. Further, it is found that if one slowly passes the threshold condition for laser action, the intensity jumps from zero to a certain value and vice versa. This effect has also been verified experimentally. 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..

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Meet Our Editors

Editor-in-Chief
Aaron R. Hawkins
Brigham Young University