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Quantum Electronics, IEEE Journal of

Issue 11 • Date November 1971

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Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Publication Year: 1971 , Page(s): 0
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    Freely Available from IEEE
  • Amplification cross section of the 1.052-µ transition of Nd3+in POCl3- SnCl4-(H2O) system by three different methods

    Publication Year: 1971 , Page(s): 519 - 522
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB)  

    We report the measurement of the amplification cross section σ21of the Nd3+ion in the POCl3-SnCl4-(H2O) system by three different methods. The first is based on the simultaneous measurement of the variation of fluorescence and Q -spoiled laser emission. The second is purely spectroscopic. The third is based on the measurement of k12at several temperatures. The two last methods give similar results. The most probable value is \sigma _{21} = 8.5 \times 10^{-20} cm2. An explanation for the lowest value \sim 6 \times 10^{-20} cm2found with the first method is given. View full abstract»

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  • Crystal symmetry effects on nonlinear optical processes in optical waveguides

    Publication Year: 1971 , Page(s): 523 - 529
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (573 KB)  

    A general three-wave nonlinear (NL) optical interaction can be phase matched using the dispersion of optical waveguide modes. The phase-match condition can be fine tuned by varying the direction of propagation in a two-dimensional waveguide and using a birefringent NL material with an orientation that preserves TE and TM mode propagation. Two general cases are found where this technique is possible. The effects of crystal symmetry and orientation on the size of the NL interaction are calculated for all birefringent crystal classes and cubic crystal classes. View full abstract»

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  • A pin-electrode atmospheric-pressure CO2laser

    Publication Year: 1971 , Page(s): 530 - 531
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (241 KB)  

    A 1.2-m-long transversely excited atmospheric-pressure (TEA) CO2laser utilizing shower discharges is described and its operating characteristics as a function of voltage examined up to 60 kV. Pulse energies in excess of 2 J, peak powers in excess of 20 MW, and efficiencies up to 15 percent have been achieved. View full abstract»

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  • Stimulated brillouin scattering in liquids of high viscosities and cyclohexane

    Publication Year: 1971 , Page(s): 537
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    The stimulated Brillouin scattering in glycerine, glycol, phenol, cyclohexanol, and cyclohexane was studied. Our results are fairly consistent with those obtained by other workers using spontaneous Brillouin scattering. View full abstract»

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  • More infrared laser transistions in atomic iodine

    Publication Year: 1971 , Page(s): 537 - 538
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1971 , Page(s): 0
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    Freely Available from IEEE
  • Proposed electrooptical PCM multiplexer-demultiplexer

    Publication Year: 1971 , Page(s): 533 - 535
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    A reciprocal time multiplexer-demultiplexer for optical PCM is proposed. The device is based on the coincidence of an optical pulse and a modulating voltage pulse in an electrooptic crystal. Both a lumped and a traveling-wave configuration are described. View full abstract»

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  • Basic characteristics of high-frequency Stark-effect modulation of CO2lasers

    Publication Year: 1971 , Page(s): 512 - 519
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (880 KB)  

    The molecular Stark effect and its application to the modulation of infrared laser radiation have been investigated both theoretically and experimentally. Using a density matrix approach, a quantum mechanical description of the effect of a time-varying electric field on the absorption coefficient and refractive index of a molecular gas near an absorption line has been formulated. For modulation applications a quantity known as the "modulation depth" is of prime importance. Theoretical expressions for the frequency dependence of the modulation depth show that the response to the frequency of a time-varying Stark field is separated into a nondispersive and a dispersive region, depending on whether the modulating frequency is less than or greater than the homogeneous absorption linewidth. Experimental results showing nondispersive modulation at frequencies to 30 MHz are presented. In addition it is shown that the response of modulation depth to Stark field amplitude is separated into linear and nonlinear regions, the field at which nonlinearities begin being determined by the absorption spectrum of the molecule being used. View full abstract»

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  • Power and efficiency of a continuous HF chemical laser

    Publication Year: 1971 , Page(s): 501 - 507
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB)  

    Experimental measurements of laser power output and chemical efficiency are reported for a continuous HF chemical laser. In this device, arc-heated N2is mixed in a plenum with SF6to provide F atoms. The mixture is expanded to form a supersonic jet into which H2is diffused. Population inversion and lasing are due to H2+ F → HF(υ) + H, \upsilon \leq 3, \Delta H = -31.7 kcal. Power levels up to 1 kW have been obtained. The efficiency of conversion of chemical energy to laser power is 16 percent at low SF6flow rates and approximately 10 percent at peak power. For a fixed arc power, addition of O2into the plenum raises peak power by about 25 percent under present operating conditions and reduces sulphur deposition on mirror surfaces. The presence of HF and DF in the plenums of DF and HF lasers, respectively, did not appear to degrade laser performance. (HF and DF levels up to 10 percent of the local F concentration were studied.) However, the presence of HF and DF in the plenums of HF and DF lasers, respectively, did degrade laser output. For given flow conditions, peak net laser power was obtained when the optical cavity axis was about 2 cm downstream of the H2injection station. The net output power was reduced to zero when the cavity axis location was increased to 5 cm. View full abstract»

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  • Mass spectroscopic studies of the CO laser discharge

    Publication Year: 1971 , Page(s): 535 - 536
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    The effects of adding Xe, H2, and O2to the CO-He laser discharge are studied mass spectroscopically. Xe greatly reduces CO dissociation. H2does not react chemically but alters discharge kinetics. O2has little effect on the CO-Xe-He discharge but reduces CO dissociation in CO-He. View full abstract»

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  • Electrostrictive self-focusing of picosecond laser pulse trains

    Publication Year: 1971 , Page(s): 532 - 533
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    A nanosecond-long train of picosecond laser pulses theoretically can produce self-focusing by electrostriction, even though the trapping threshold for a single picosecond pulse is very high. The relative roles of electrostriction and various types of Kerr effect in picosecond pulse train self-focusing should be assessed. View full abstract»

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  • Electron energy distribution in CO2laser discharges

    Publication Year: 1971 , Page(s): 508 - 512
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB)  

    Electrical plasma parameters of the CO2laser were investigated by probe and high-frequency techniques. The electron energy distribution function was measured by the second derivative method. The relatively high-pressure effect on the electron probe current was taken into account when analyzing the experimental curves. The influence of the addition of N2, He, Xe and the influence of CO2dissociation on the plasma discharge properties were studied. Calculations of the pumping rates to vibrational levels taking part in creating inversion show that the influence on output power of a CO2laser usually observed with the addition of N2and He cannot be explained by a changing of the electron component of the plasma. The increase of output power and efficiency with addition of Xe to the CO2laser is connected with an essential changing of plasma parameters of the electron component. 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