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Quantum Electronics, IEEE Journal of

Issue 1 • Date January 1981

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1981 , Page(s): 0
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    Freely Available from IEEE
  • A powerful new optically pumped FIR laser - Formylfluoride

    Publication Year: 1981 , Page(s): 13 - 14
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    Intense FIR laser action is reported in formylfluoride (HFCO) with 7 lines of the normal CO2laser and 4 lines of the C18O2laser. View full abstract»

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  • [Back cover]

    Publication Year: 1981 , Page(s): 0
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    Freely Available from IEEE
  • Population inversion of Cd+excited states in the plasma of cadmium vapor vacuum arc

    Publication Year: 1981 , Page(s): 8 - 10
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    Population densities of excited states in a cadmium vacuum arc plasma were investigated spectroscopically and their absolute values were calculated using absolute measurements of the spectral lines' intensity emitted from the plasma. A transient population inversion was observed among the ng^{2}G(n = 6-11) group of levels and between the upper and lower levels of the transitions: 6g^{2}G_{9/2} \rightarrow 4f^{2}F_{7/2}, 10g^{2}G_{9/2} \rightarrow 4f^{2}F_{7/2}, 11g^{2}G \rightarrow 4f^{2}F_{7/2} , whose maximal estimated one-pass gain values are 1.75, 1.002, and 1.004, respectively. View full abstract»

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  • Proposals and analyses on laser amplifier based integrated optical circuits

    Publication Year: 1981 , Page(s): 23 - 28
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1448 KB)  

    Simplified traveling wave laser (TWL) amplifier equations are given based on a lumped model. Pulse transfer characteristics for a TWL amplifier are examined theoretically. A new class of integrated optical amplifier with three terminals (OPATT) has been proposed as an optical analog of the electric transistor. Analytical formulas and dynamic properties of an OPATT have been considered. OPATT-based optical integrated circuits, including optical differential amplifiers, comparators, saturable oscillators, and optical logic gates, have been investigated theoretically. View full abstract»

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  • The intrinsic electrical equivalent circuit of a laser diode

    Publication Year: 1981 , Page(s): 4 - 7
    Cited by:  Papers (36)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1112 KB)  

    The basic electrical equivalent circuit of a laser diode is derived. The effects of spontaneous emission and self-pulsations are included. It is found that self-pulsations are represented by a negative resistance in the model. Application of this model suggests purely electronic methods of suppressing relaxation oscillations in laser diodes. View full abstract»

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  • Long-pulse N2UV lasers at 357.7, 380.5, and 405.9 nm in N2/Ar/Ne/He mixture

    Publication Year: 1981 , Page(s): 77 - 81
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    Using long-pulse electron-beam pumping, long-pulse laser emissions at 357.7, 380.5, and 405.9 nm have been observed in the second positive system of nitrogen with pulse durations of 150, 400, and 400 ns, respectively. Substantial improvements in laser performance were observed by adding excess Ne and He into N2+ Ar mixtures. Peak powers of 56, 44, and 66 kW/cm2have been obtained for the three wavelengths, respectively. View full abstract»

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  • Self-focusing effects in pulsating AlxGa1-xAs double-heterostructure lasers

    Publication Year: 1981 , Page(s): 60 - 68
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3224 KB)  

    Using proton bombarded stripe geometry lasers which emit intense optical pulses, we have measured the width of the optical beam in the plane of the junction as a function of time during the pulse. The width of the beam is qualitatively proportional to the change in the carrier density. The width increases during the quiescent period between pulses where the carrier density increases by current injection and decreases during the emission of the pulse. For one laser studied in considerable detail, the full width at half intensity decreases from 9 μm at the start of the pulse to 7.2 μm at the end of the pulse. The reduction in the width results from the self-focusing of the beam. It is due to an increase in the refractive index and the decrease in the gain distributions near the center of the stripe. The reduction in the beamwidth concentrates the mode to a region of sufficiently higher average gain to compensate for the reduction in spatial gain distribution. The self-focusing acts to reduce the damping of the relaxation oscillations, and thus enhances the effect of other nonlinearities such as saturable absorption in causing pulsations. The thermal induced refractive index distribution across the stripe is shown to play a crucial role in the gain instability caused by self-focusing. View full abstract»

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  • Compact long-life high PRF 722.9 nm neutral lead vapor laser

    Publication Year: 1981 , Page(s): 11 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    Several new construction techniques for a compact long-life high pulse-repetition frequency (PRF) 722.9 nm neutral lead vapor laser are described. A quartz discharge envelope, coaxial oven, and controlled semiself-heating techniques were employed. An average laser output power of 90 mW at a pulse repetition rate of 5 kHz has been obtained with a discharge efficiency of 0.03 percent. View full abstract»

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  • Polarization in optical fibers

    Publication Year: 1981 , Page(s): 15 - 22
    Cited by:  Papers (119)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2872 KB)  

    Recent research on fibers with very small or very large birefringence for polarization-dependent applications is reviewed. The nature of random coupling between normal modes of polarization is analyzed and discussed in connection with various applications. View full abstract»

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  • Measurements of waveguide structure fluctuation in a multimode optical fiber by backscattering technique

    Publication Year: 1981 , Page(s): 39 - 44
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1864 KB)  

    Utility of a backscattering technique for measuring waveguide structure fluctuation along a fiber is confirmed quantitatively. The backscattering technique is applied to three graded-index fibers: one fiber has uniform structure and the others have core diameter and refractive-index difference changes along the fiber length. The structural parameter fluctuations measured by the technique are in good agreement with those measured directly by the interference microscopy at several positions along the fibers. The resolvability and accuracy of the measured results by the backscattering technique is also compared with the relative error of the direct measurements. View full abstract»

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  • Diode laser optical recording using trilayer structures

    Publication Year: 1981 , Page(s): 69 - 77
    Cited by:  Papers (4)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3216 KB)  

    A new high-power diode laser and a more sensitive trilayer disk structure useful for FM video and digital data recording have been demonstrated. The diode laser is a constricted double-heterojunction large optical cavity (CDH-LOC) device capable of up to 100 mW output power in a single stable mode. By improving the thermal efficiency of the trilayer structure, the sensitivity is improved by a factor of two over previously reported trilayer structures. Digital signals with data rates up to 30 Mbits/s and storage capacity in excess of 3 \times 10^{10} bits are demonstrated using a plastic 12 in diameter disk rotating at 30 r/s while digital systems with data rates up to 60 Mbits/s and storage capacity in excess of 1011bits are shown to be feasible. View full abstract»

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  • Modeling of picosecond pump and probe photobleaching experiments on fast saturable absorbers

    Publication Year: 1981 , Page(s): 95 - 102
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2592 KB)  

    A model is developed for the time evolution of the transmission of a dye during and after photobleaching by an intense pulse of light. The model is used to calculate the effects, which can be considerable, of the characteristics of the probe pulse used to measure the transmission of the sample, and criteria are established for the accurate determination of ground state recovery times from such observations. The saturation behavior of the dye is also modeled, and it is shown that saturation curves are of almost no value in deducing GSR times. The calculations are compared with results of experiments on Kodak Dye 9860 with excellent agreement. View full abstract»

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  • Fields in a curved optical fiber

    Publication Year: 1981 , Page(s): 29 - 34
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1544 KB)  

    The mutual relation between transverse and longitudinal electromagnetic field components in a curved optical fiber is derived. The wave equations for transverse fields much simpler than those for longitudinal fields are obtained in the first-order perturbation. The wave equations for a radially inhomogeneous fiber derived in a toroidal coordinate system are equivalent to those derived from a straight waveguide approximation with an effective index profile incorporated with the curvature effect. Linearly polarized mode representation holds exactly only for the fundamental mode. View full abstract»

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  • Operating characteristics of a high repetition rate miniature rare-gas halide laser

    Publication Year: 1981 , Page(s): 81 - 91
    Cited by:  Papers (3)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3496 KB)  

    Performance characteristics of a high repetition rate rare-gas halide minilaser are reported. At 1 kHz pulse repetition frequency over 1 mJ per pulse at KrF and 0.5 mJ per pulse at XeCl wavelengths are obtained. Net small-signal gains greater than 0.3 cm-1are observed in XeCl. The wall plug efficiency is measured to be as high as 0.25 percent. View full abstract»

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  • Spectral characteristics of external-cavity controlled semiconductor lasers

    Publication Year: 1981 , Page(s): 44 - 59
    Cited by:  Papers (56)  |  Patents (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5584 KB)  

    Experiments with an external-cavity semiconductor laser indicate that single-frequency oscillation may be obtained in an injection laser when the gain is temporally and spatially stabilized within the active region. Using an originally multimode laser diode as the gain medium, the external-cavity laser oscillates stably in the fundamental spatial mode and in a single longitudinal mode with a frequency which is tunable over a 10 nm spectral range. The rms frequency jitter of the unstabilized laser is 500 kHz. These mode characteristics suggest that spatially inhomogeneous gain saturation is significant only in the lateral direction in the active region of a stripe-geometry double-heterostructure laser diode. A quantitative analysis of the spontaneous emission in the spectral vicinity of the lasing mode shows no evidence of spectral hole burning, with a 0.5 percent upper limit to the depth of the hole burned in the gain spectrum by a lasing mode power of 5 mW. View full abstract»

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  • Measuring molecular flows with high-resolution stimulated Raman spectroscopy

    Publication Year: 1981 , Page(s): 2 - 4
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1056 KB)  

    We propose using high-resolution stimulated Raman spectroscopy to directly measure high-speed molecular flow velocities in wind tunnels and in combustive chambers. Our feasibility study indicates that flow speeds from Mach 0.04 up may be measured with the proposed method using available laser systems. It is pointed out that the success of the proposed technique will make possible the potential of measuring all interesting flow parameters, i.e., species concentration, temperature, and velocity, in a time of less than 1 μs at a repetition rate of 104/s using a single experimental arrangement. View full abstract»

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  • Effective cutoff wavelength of the LP11mode in single-mode fiber cables

    Publication Year: 1981 , Page(s): 35 - 39
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2168 KB)  

    The effective cutoff wavelength of the LP11mode is investigated for nylon-coated step-index type single-mode fibers stranded in a cable. It is found from the pulse propagation experiments that the single-mode operation is effectively attained in the two-mode region up to the V -value of 3.0. It is numerically estimated that splice loss, bending loss, and absorption loss due to the OH-ion in cladding are reduced by choosing the operating V -value as large as 3.0. View full abstract»

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  • Performance analysis of a dye-switched ruby laser under the step function Q-switch model

    Publication Year: 1981 , Page(s): 92 - 95
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1344 KB)  

    The performance of a dye-switched, 15 cm × 0.95 cm ruby laser, pumped by two linear flashlamps, in a polished, double elliptical cavity is reported. The Q -switched output energy is examined under the step function Q -switch model. It is noted that the Q -switched output energy shows a linear dependence on the flashlamp input energy, at variance with the step function Q -switch theory, for a uniformly pumped laser. This anomaly is explained on the basis of non-uniform pumping. The energy ultilization factor using this theory is also reported. View full abstract»

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  • FM eliminated CH4locked frequency stabilization of 3.39 µm He-Ne laser in dual feedback control

    Publication Year: 1981 , Page(s): 103 - 108
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1784 KB)  

    The frequency of the 3.39 μm He-Ne laser was locked to the CH4saturated absorption line by means of integral-proportional feedback control, i.e., dual feedback control. The frequency modulation was applied by a vibrating mirror placed outside a laser cavity, obtaining a modulation-free laser beam with a stabilized frequency. The long-term stability achieved under integral feedback control was about \pm1.1 \times 10^{-11} , which was further improved to \pm 1.35 \times 10^{-12} under dual feedback control. The Allan variance measured by the photomixing technique was 1.77 \times 10^{-12} at an average time 100 s. 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
Aaron R. Hawkins
Brigham Young University