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Quantum Electronics, IEEE Journal of

Issue 11 • Date November 1985

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • Announcing a special issue of the IEEE journal of quantum electronics on applications of quantum electronics to inertial sensing, frequency standards, and clocks

    Page(s): 1742
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  • A rate equation analysis for the frequency chirp to modulated power ratio of a semiconductor diode laser

    Page(s): 1749 - 1751
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    An expression for the frequency chirp to modulated power ratio (CPR) is derived from a rate equation analysis of the small-signal, injection current modulation in a semiconductor diode laser. The model includes the effect of lateral carrier diffusion across the active region of the laser diode. The modulation frequency dependence of the CPR is flat from dc to a few hundred megahertz, beyond which it is proportional to the modulation frequency. View full abstract»

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  • Array-mode far-field patterns for phase-locked diode-laser array: Coupled-mode theory versus simple diffraction theory

    Page(s): 1752 - 1755
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    A simple, closed-form expression is derived for the far-field patterns corresponding to the modes of a phase-locked array ofNidentical elements. That allows a comparison between the correct array-mode far-field patterns (i.e., coupled-mode theory) and the heuristic, diffraction-grating-like far-field patterns generated by using simple diffraction theory. The correct diffraction-limited lobewidth is determined as a function of array-element number. View full abstract»

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  • 60 J quasistationary electroionization laser on Xe atomic metastables

    Page(s): 1756 - 1760
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    A high-pressure (p = 3.5atm) electroionization laser operating on the5d-6pxenon atomic transitions is investigated for a pumping pulse duration range up to 30 μs. An output energy of more than 60 J has been achieved with an Ar-Xe mixture and an active volume of 10 1. The angular divergence of the radiation was about5 times 10^{-5}rad. The advantages of such laser systems for industrial use is discussed. View full abstract»

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  • The transient evolution of AM mode locking a TEA CO2laser

    Page(s): 1772 - 1776
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    The evolution of the pulse in an AM mode-locked TEA CO2laser has been investigated. The experiments have been performed by injecting the mode-locked pulses in a high-pressure slave oscillator at various time intervals after the initiation of the mode-lock process. This technique allows the measurements of the pulse widths independent on the pulse energies. A numerical solution of a dynamic model for the mode-locking process accurately predicts the transient evolution. It is shown that the build-up time to reach steady state can be, depending on the modulation depth, considerably larger than the duration of the pulse train. View full abstract»

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  • Amplified spontaneous emission in narrow-band pulsed dye laser oscillators - Theory and experiment

    Page(s): 1782 - 1794
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    We have investigated the effect of amplified spontaneous emission (ASE) on the spectral and temporal characteristics of narrow-band pulsed dye laser oscillators. The space and time dependent rate equations for the molecular populations and photon fluxes have been solved numerically to study the dependence of ASE on various laser parameters and the effects of ASE on the spectral and temporal profile of the dye laser output. To account for the diffraction losses present in a real dye laser oscillator, appropriate feedback factors for the laser and ASE photon fluxes were introduced into the boundary conditions for the oscillator. These theoretical results have been substantiated by experimental measurements of ASE in a narrow-band pulsed dye laser oscillator. We show that a considerable reduction of ASE in a grazing incidence grating dye laser oscillator can be obtained by appropriately shaping the pump pulse. Oscillations observed in the temporal output of pulsed dye lasers are also discussed. View full abstract»

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  • Amplification of tunable, picosecond pulses from a single-mode, short cavity dye laser

    Page(s): 1795 - 1798
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    The design and performance of an Nd+3:YAG pumped, short cavity dye laser-dye amplifier system is reported. This system produces narrow bandwidth, broadly tunable picosecond pulses with energies in the millijoule range. View full abstract»

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  • An analysis of intersecting diffused channel waveguides

    Page(s): 1799 - 1805
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    The coupling characteristics of intersecting diffused channel waveguides are computed for realistic three-dimensional diffusion profiles by means of the propagating beam method (PBM). Both TE and TM polarizations are treated for waveguides formed onz-cut LiNbO3. Good agreement between computed and previously reported measured results is found for the TE polarization. Agreement between computed and measured results is not as good for the TM polarization. This is explained by the fact that the applicable2Deltan-waveguide supports four modes, which should make coupling characteristics very sensitive to input conditions. View full abstract»

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  • A capacitively coupled RF-excited CW-HCN laser

    Page(s): 1833 - 1837
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    A capacitively coupled RF-excited CW-HCN submillimeter wave laser has been investigated to obtain about 260 mW in continuous wave at 337 μm using a laser tube of about 1 m in length and 55 mm in diameter. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Coupled mode theory of optical resonant cavities

    Page(s): 1819 - 1826
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    This paper presents a theory describing coupled optical resonant cavities by means of systems of time-dependent coupled equations for the field amplitudes of standing waves in each resonator. The coupling coefficients entering the theory are derived from first principles. To the author's knowledge, this theory is new. The coupling coefficients can approximately be related to the amplitude transmission coefficients of traveling waves passing between the two resonant cavities. This relationship is checked for an example. Finally, we show that the mode amplitudes of one cavity can be eliminated so that the field in the other cavity becomes coupled to samples of itself taken at earlier times. The coupled-cavity theory applies to cavities with loss or gain. It is here expressed in scalar approximation, but it can easily be extended to vector fields. View full abstract»

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  • Sealed, miniaturized, corona-preionized, high-repetition-rate TEA CO2laser using hydrogen buffered gas mixtures

    Page(s): 1766 - 1771
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    Sealed-off operation of a compact, corona-preionized, TEA CO2laser capable of efficient laser action at pulse repetition frequencies of up to 1 kHz is reported. By adding hydrogen to the basic gas mixture we have been able to maintain discharge stability and constant average output power for more than 20 million laser shots at a 400 Hz repetition frequency with peak powers in excess of 350 kW. View full abstract»

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  • Lasing in N2O and CO2isotope mixtures pumped by blackbody radiation

    Page(s): 1777 - 1781
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    The use of N2O and CO2isotopes as active species for a blackbody radiation pumped laser has been experimentally demonstrated and theoretically analyzed. The results obtained for mixtures containing N2O,13C16O2, and12C18O2are presented. For the first time, continuous lasing action with blackbody radiation pumping has been obtained for this species. Two active species mixtures were tested, obtaining up to a 100 percent increase in output power due toupsilon-upsilontransfer. A simple model was developed and gain calculations are presented. View full abstract»

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  • Frequency response of InP/InGaAsP/InGaAs avalanche photodiodes with separate absorption "grading" and multiplication regions

    Page(s): 1743 - 1746
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    We have measured the frequency response of InP/ InGaAsP/InGaAs photodiodes with separate absorption, "grading," and multiplication regions (SAGM-APD's) for a wide range (2 leq M_{0} leq 35) of dc gains. The results are explained in terms of a theoretical model which incorporates the transit time of carriers through the depletion region, the RC time constant, the accumulation of holes at the valence band discontinuity of the heterojunction interfaces, and the gain-bandwidth limit. View full abstract»

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  • Phase and amplitude fluctuations in a mode-locked laser

    Page(s): 1806 - 1813
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    Comparisons are made of the phase and amplitude fluctuations of a laser when it operates single mode and when it is mode locked with the same total average power. Despite the much lower signal-to- (spontaneous emission) noise ratio of the mode-locked laser, the linewidth of each of the locked modes is the same as that of the single mode. The fluctuation of the total intensity of the mode-locked laser, and the linewidth enhancement factor due to intensity fluctuation as recently analyzed by Henry, are the same in both cases. View full abstract»

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  • Measurement of FM noise, AM noise, and field spectra of 1.3 µm InGaAsP DFB lasers and determination of the linewidth enhancement factor

    Page(s): 1814 - 1818
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    The FM and AM noise spectra of 1.3 μm InGaAsP DFB lasers are measured in the frequency range from dc to 4 GHz. The relaxation resonances appearing in these spectra are compared to the semiclassical theory of laser noise. All the resonance parameters, i.e., the linewidth enhancement factor α, the resonance frequency fR, and the damping constant γe, are determined from the FM noise spectra by successful curve fitting. The estimated value of α is 2.2. Field spectra for various bias currents are measured by using optical heterodyne detection. Theoretical lineshapes are obtained by using four noise-parameter values which have been determined from the FM noise and the linewidth measurements. The results are in excellent agreement with the measured spectra. This agreement verifies the estimation thatalpha = 2.2. View full abstract»

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  • Transverse-discharge copper-vapor laser

    Page(s): 1747 - 1748
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    A novel transverse-discharge copper-vapor laser has been developed using a flat-plate Blumlein pulse-forming circuit. This copper-vapor laser system generates a current pulse with a fast rise time (<10 ns) and laser-specific energy density of 22 μJ/cm3even under a highly contaminated condition. An 8 ns long laser pulse is generated in an approximately1 times 1 times 20cm3volume, producing a specific power density of 2.8 kW/cm3. The results of the preliminary measurements of the laser parameters are presented. View full abstract»

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  • Electron-beam pumped KrF laser extraction measurements for high Kr concentration gas mixtures

    Page(s): 1761 - 1765
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    Energy extraction measurements are obtained with a 350 ns electron-beam pumped KrF laser (Ar diluent) at Kr concentrations from 4-99.6 percent. During the measurements, the F2number density is held constant at8.9 times 10^{16}cm-3, and the average pump rate is maintained at ≈120 kW/cm3by adjusting the total pressure of the gas mixtures in order to compensate for the different electron stopping powers of Ar and Kr. For the 4, 10, and 99.6 percent Kr cases, total pressures are 1040, 1004, and 665 torr, respectively. Average output efficiencies in percent of 9.3 at 4 percent Kr, 11.2 at 10 percent Kr, and 9.2 at 99.6 percent Kr are obtained. Peak power efficiencies in percent of 9.6 at 4 percent Kr, 12.5 at 10 percent Kr, and 11.6 at 99.6 percent Kr are derived from the data. Our computer model predictions agree with the results. View full abstract»

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  • Theory of two coupled lasers

    Page(s): 1838 - 1844
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    The phase-locking of two coupled lasers is studied using the model of Spencer and Lamb. Tuning curves for the odd and even normal modes of two coupled empty resonators are presented to show the origin of the strong frequency-pulling of the coupled lasers. It is shown that the even mode is preferable for combining the two laser beams in the far field. Scaling relations, obtained for the locking range, reduce the number of effective parameters of the coupled system. In the limits of very large gain and very weak coupling the locking range is found to be narrower than predicted by the Spencer-Lamb coupled laser theory. View full abstract»

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  • Laser oscillation at 3-4 µm optically pumped InAs1-x-ySbxPy

    Page(s): 1827 - 1832
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    Quaternary InAs1-x-ySbxPy) and ternary InAs1-xSbxhave been grown on InAs substrates using liquid phase epitaxy. The quaternary layers are lattice matched to InAs fory = 2.2x, and have bandgaps greater than InAs. The ternary layers have lower bandgaps than InAs, but have larger lattice constants. Reasonable quality growth has been obtained up tox = 0.15where the luminescence peak is shifted to ∼4 from 3.1 μm and the lattice mismatch is ∼0.01. Optically pumped laser emission at 3.1 μm has been observed from 77 to 100 °K using an InAs active layer with InAs1-x-ySbxPyclading layers. Laser emission at 3.9 μm has been observed from 77 to 125 °K using a InAs1-xSbxactive layer, withxsim 0.13, and InAs cladding layers. Laser emission from intermediate ternary compositions has also been observed. 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