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Quantum Electronics, IEEE Journal of

Issue 7 • Date July 1973

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Publication Year: 1973 , Page(s): 0
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    Freely Available from IEEE
  • A simple molecular-orbital theory of the nonlinear optical properties of group III-V and II-VI compounds

    Publication Year: 1973 , Page(s): 755 - 762
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    The second-order nonlinear optical susceptibility in the low-frequency limit for Group III-V and II-VI semiconductors can be understood in terms of a very simple and yet surprisingly accurate molecular-orbital model of the tetrahedral bonds of the crystal. The physical origin of the nonlinearity is the field-dependence in the ionicity of the bond due to the transfer of valence charge from one atom to the other forming the bond in the presence of the applied field. The sign of the second-order nonlinear susceptibility is directly related to the polarity of the permanent electronic dipole moment of the valence charge distribution on the bond. View full abstract»

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  • The transversely adjusted gap laser for optical communication systems

    Publication Year: 1973 , Page(s): 762 - 768
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    If a laser's energy gap is adjusted spatially so that it varies with position in a plane transverse to the direction of light propagation then each position in the transverse plane will amplify a different part of the spectrum. A simple optical technique is shown for dispersing an optical beam so that each frequency component passes through the appropriate part of a transversely adjusted gap (TAG) laser. A TAG laser can be constructed by subjecting a GaAs injection laser to a transverse thermal gradient. Calculations indicate that such a device would have a bandwidth of 20 \times 10^{12} Hz for a 25-fold increase compared to a conventional GaAs injection laser. An analysis of optical ray angle and spatial-dispersion alignment tolerances is presented. Two TAG-laser subsystems-a multiplex modulator and an amplifier-are proposed and discussed to indicate how the TAG laser's larger bandwidth and spatial dispersion may simplify optical communication systems. A preliminary-test TAG-laser oscillator has been constructed and tested. It verified the basic concept and exhibited a bandwidth of 2.45 \times 10^{12} Hz as predicted by the model. View full abstract»

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  • Comments on "Propagating modes of a metal-clad-dielectric-slab waveguide for integrated optics"

    Publication Year: 1973 , Page(s): 780 - 781
    Cited by:  Papers (1)
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    First Page of the Article
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  • Correction to "Intracavity breakdown in CO and CO2 lasers"

    Publication Year: 1973 , Page(s): 782
    Cited by:  Papers (1)
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    First Page of the Article
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  • Mode locking of a 6118-Å He-Ne laser by use of an Ne discharge cell

    Publication Year: 1973 , Page(s): 783
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    A pure Ne discharge has been used as a saturable absorber to mode lock an He-Ne laser operating at 6118 Å. View full abstract»

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  • [Back cover]

    Publication Year: 1973 , Page(s): 0
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    Freely Available from IEEE
  • New improved laser dye for the blue-green spectral region

    Publication Year: 1973 , Page(s): 781 - 782
    Cited by:  Papers (6)
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    7-diethylamino-4-trifluoromethylcoumarin was synthesized and observed to lase at 481 nm in p -dioxane. Under repetitive flashlamp excitation, it was found that the photochemical stability of this dye solution showed a significant improvement over other dye solutions reported for the blue-green spectral region. View full abstract»

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  • High-pressure xenon laser at 1730 Å

    Publication Year: 1973 , Page(s): 748 - 755
    Cited by:  Papers (7)
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    Experimental measurements are reported of optical gain due to stimulated transitions between the lowest-bound diatomic states of xenon (Xe) and the repulsive ground state. The optical gain was greatest at a wavelength of (1730 ± 10) Å, where the effective gain cross section is estimated to be 7 \times 10^{19} cm2. View full abstract»

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  • Detection of optical and infrared radiation with DC-biased electron-tunneling metal-barrier-metal diodes

    Publication Year: 1973 , Page(s): 737 - 745
    Cited by:  Papers (17)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3056 KB)  

    The voltage obtained from metal-barrier-metal (MBM) diodes by phase-sensitive detection when illuminated with optical and near-infrared radiation, modulated at 880 Hz, has been studied as a function of an applied dc bias. The detected voltage is a nonlinear function of the bias voltage for high junction impedances, and linear for low junction impedances. The nonlinearity in the junction has been shown to be consistent with electron tunneling theory. View full abstract»

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  • Kinetics of bleaching in polymethine cyanine dyes

    Publication Year: 1973 , Page(s): 745 - 748
    Cited by:  Papers (1)
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    Observation of the time variation of the transmission of some polymethine cyanine dyes in solution after a short excitation has allowed the direct measurement of tile fluorescence decay time, and in some cases, the solvent orientational relaxation time. View full abstract»

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  • Mode selection in GaAs injection lasers resulting from fresnel reflection

    Publication Year: 1973 , Page(s): 772 - 776
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1568 KB)  

    In several recent papers, attention has been given to the Fresnel reflectivity associated with cleaved facets of the laser. The small dimensions of the heterostructure waveguide give rise to a considerable angular spread in the energy incident on the facet. As a result, the mode reflectivity is not given simply by the Fresnel equation, which is only valid for an infinite plane wave. Rather, it is a properly weighted average over the plane-wave distribution of the mode. The differences in mode reflectivity with respect to TE and TM modes, as well as the variations with mode number, have been offered as a possible explanation for the predominant appearance of TE modes and preference for higher order modes in the large optical-cavity (LOC) geometry. However, the considerations to date have ignored the finite extent of the field in the junction plane. This situation is rectified in this paper. It is shown that the splitting in the mode reflectivity values between TE (electric field in the junction plane) and TM (electric field perpendicular to the junction plane) modes is reduced, and under certain conditions TM modes can be favored. In particular, it is shown that if a TE mode is oscillating, then there is a preference for a lowest order mode in the plane of the junction and a highest order mode in the transverse plane. Conversely, if for some reason a TM mode is oscillating, then the preference is for highest order modes in the plane of the junction and lowest order modes in the transverse plane. View full abstract»

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  • Investigation of the characterstics of a mode-locked Nd:Glass laser with the aid of a picosecond streak camera

    Publication Year: 1973 , Page(s): 768 - 772
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1616 KB)  

    An infrared-sensitive streak camera, capable of resolving optical pulses of durations of ∼3 ps, has been used to analyze the temporal development of the individual picosecond pulses in a mode-locked pulse train. A progressive increase in the duration of the individual pulses throughout the pulse train is observed, the rate of increase in the pulse duration being an approximate quadratic function of the optical field. In addition, temporal analysis of the laser output signal, dispersively delayed with the aid of a grating pair, confirms the existence of phase-modulation effects during the development of the mode-locked pulse train. View full abstract»

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  • Effect of rotational level coupling on pulse sharpening in CO2amplifiers

    Publication Year: 1973 , Page(s): 731 - 736
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    The linear (small-signal) and nonlinear temporal response of CO2laser media was studied. Experimental results of the amplification of optical pulses whose duration is comparable to the inverse gain-bandwidth of the amplifying medium are described. Pulse narrowing, a consequence of nonlinear amplification, was observed. Computer calculations based upon a two-level model incorporating phenomenologically CO2rotational level coupling are compared with experimental observations. View full abstract»

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  • Simultaneous CO and CO2laser

    Publication Year: 1973 , Page(s): 779 - 780
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    CW laser action at both the 5- and 10.6-μm wavelength regions has been achieved simultaneously from CO and CO2molecules in a slowly flowing mixture of He-air-CO. Two dc discharges through the premixed gases within a segmented laser cavity were used to provide molecular excitation and generate CO2molecules by discharge-initiated CO oxidation. Both liquid nitrogen and room-temperature water cooling were used concurrently. A total power of about 2 W has been achieved with approximately half the power in each wavelength region. View full abstract»

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  • Electron temperature and density in the He-CdI2positive column used for and I+laser

    Publication Year: 1973 , Page(s): 776 - 778
    Cited by:  Papers (1)
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    Plasma parameters in the He-CdI2positive column used for an I+ laser were measured using a probe. The presence of iodine seems to partially cancel the influence on the electron temperature of the Penning process which is very dominant in the He-Cd positive column. View full abstract»

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  • Pressure dependency of the NF3-H2transverse-discharge pulse-initiated HF chemical laser

    Publication Year: 1973 , Page(s): 723 - 730
    Cited by:  Papers (5)
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    The pressure dependency of the performance of the NF3-H2chemical-laser system has been evaluated. The laser energies at various chemical compositions and initiation discharge energies are presented as functions of Pressure. Overall efficiency, laser pulsewidth, and effects of additive gases are also presented. For all compositions the laser energy maximized at a pressure P_{\max } which was observed to be dependent on the pulsewidth of the initiation discharge. At pressures below P_{\max } the laser energy was proportional to the partial pressure of NF3or H2. No change in slope of the laser energy versus pressure curve was observed in going from low-pressure nonexploding regimes to high-pressure exploding regimes, implying that the reactions causing the explosion did not contribute to the lasing. Lasing usually occurred in two peaks, the first containing HF(V=2) \rightarrow HF(V=1) lines and the second containing HF(V=3) \rightarrow HF(V=2) and HF(V=1) \rightarrow HF(V=0) lines. These data indicate that lasing is due to the reaction sequence: 1) NF_{3} + e^{-} = \cdot NF_{2} + F\cdot + e^{-}; 2) F\cdot + H_{2} = HF+(V) + H\cdot ; and 3) HF+(V) + h\nu = HF+(V-1) + 2h\nu . 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