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Quantum Electronics, IEEE Journal of

Issue 6 • Date June 1980

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • Announcement of new associate editors

    Page(s): 586
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    Freely Available from IEEE
  • A new design concept for hollow-cathode white light laser

    Page(s): 590 - 592
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    A white light laser has been constructed which employs a concentric cylinder type laser tube and embodies the novel concept of separating the functions of confining the negative glow providing for diffusion of Cd vapor. The main source preventing the white light oscillation in previous designs is not a lack of Cd vapor in lasing zone but a decrease of the hollow-cathode effect due to many holes of large diameter. View full abstract»

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  • Soft X-ray population inversion in laser plasmas by resonant photoexcitation and photon-assisted processes

    Page(s): 603 - 618
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    In this paper, the results of studies on soft X-ray population inversion by the resonant photoexcitation process are presented. The experimental studies in highly ionized multicomponent plasmas produced by high power glass laser indicate large population inversion densities at wavelengths l\sim 130 Å. Intensity inversions of resonance lines from the n = 3 and n = 4 levels of Mg11+ions at electron densities as high as 1020cm-3have been observed, indicating that gains of \sim 5-10 cm-1have been achieved. These results and other photon-assisted soft X-ray population inversion schemes in inhomogeneous plasmas are discussed. View full abstract»

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  • A study of VUV fluorescence and lasing in electron beam excited xenon

    Page(s): 640 - 649
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    An experimental and theoretical study of VUV radiation in electron-beam excited xenon was undertaken. Fluorescence was observed with efficiencies approaching 50 percent for pressures above 1 atm and modest cell currents (≤ 5 A/cm2). Lasing was also observed at pressures ≥ 2 atm but the presence of premature laser pulse termination reduced efficiencies to < 1 percent. Several possible causes of this premature pulse termination were investigated. View full abstract»

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  • A highly stable 30 W average power mode-locked Nd:YAG laser

    Page(s): 650 - 653
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    Mode locking of a CW pumped Nd:YAG laser operating in the TEM01or donut mode using an intracavity acoustooptic AM modulator is described. Mode-locking investigations to date have concentrated on obtaining as short pulses as possible at the expense of average and peak laser output power. We describe a mode-locked system for field use having an average output of 30 W, with pulses recurring at a 100 MHz rate and having a peak power in excess of 0.5 kW. Detector limited pulses of 0.6 ns duration were recorded and the mode locking was stable for several hours requiring no feedback loop or fine adjustment. View full abstract»

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  • Characteristics of the pumping pulse and the output laser pulse for a Cu/CuCl double pulse laser

    Page(s): 677 - 682
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    Characteristics of the pumping discharge pulse and laser pulse in a Cu/CuCl double pulse laser have been measured as a function of time delay, buffer gas pressure, and tube temperature. We have found that for otherwise fixed discharge conditions, pumping rates decrease as these quantities are increased. The shape of the laser pulse as a function of time delay is shown to be dependent on the rate of current rise of the pumping pulse. The length of time required by the pumping pulse to achieve threshold is found to be a function of time delay, buffer gas pressure, and tube temperature. The implications of this behavior for the role of metastable copper and its mode of relaxation are discussed. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Optical surface wave mode converters and modulators utilizing static strain-optic effects

    Page(s): 628 - 634
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    Periodic perturbations of dielectric waveguides can be obtained by an evaporated SiO2thin film grating through the static strain-optic effect. These waveguides are applied to TE-TM mode converters and modulators in Ti-diffused LiNbO3waveguides. Using a coupling length of 3 mm in an optical surface waveguide, we have demonstrated a TE-TM mode conversion efficiency of 80 percent and a TE-TM mode modulator with 100 percent modulation with an applied field of 2 V/μm. A theoretical analysis of a reflector for a semiconductor laser waveguide is also described. View full abstract»

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  • Atomic lead photodissociation laser

    Page(s): 594 - 596
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    Stimulated emission has been observed on the 405.8, 368.3, and 364.0 nm lines of neutral atomic lead following photodissociation of lead dibromide and lead diiodide molecules with the 193 nm output of an ArF laser. Two-photon dissociation processes are involved in the excitation mechanism. View full abstract»

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  • Dispersion in a laser-pumped molecular laser

    Page(s): 587 - 589
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    The dispersion equations are derived for two laser fields of arbitrary intensity interacting with a homogeneously broadened, three-level molecular system. The results obtained apply to laser-pumped molecular lasers and may be used to analyze frequency pulling of the emitting laser and self-focusing or defocusing of the pump laser. The laser fields are allowed to be of arbitrary intensity and to be on or off resonance. The dispersion function for the emitting laser \chi '(\omega _{s}) is evaluated in various limits. The present theory is applied to analyze previous experimental data for cavity frequency pulling in CO2laser-pumped molecular lasers, including a 385-μm D2O laser and a 496-μm CH3F laser. Good agreement is found between theory and experiment. View full abstract»

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  • Effect of preionization of a copper vapor laser

    Page(s): 598 - 601
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    It is shown that the operation of a copper vapor laser (CVL) in exeptionaly low E/P is due to preionization. By introducing a wire preionization to a CVL we demonstrate its influence on the laser performance. In a repetitively pulsed CVL a previous pulse can be the preionization source. View full abstract»

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  • Influences of interfacial recombination on oscillation characteristics of InGaAsP/InP DH lasers

    Page(s): 661 - 667
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    This paper presents the influences of interfacial recombination on the oscillation characteristics of InGaAsP/InP DH lasers. The effects of interfacial recombination at the two InP-InGaAsP interfaces, and a theoretical study of the oscillation characteristics such as threshold current density and differential quantum efficiency are discussed and compared with experimental results. The effects of interfacial recombination on the temperature dependence of threshold current are also examined. View full abstract»

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  • Optically pumped CW submillimeter emission lines from methyl mercaptan CH3SH

    Page(s): 684 - 685
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    Twenty-three new emission lines of CH3SH have been observed and their polarization with respect to the pumping radiation determined, but no assignments have yet been made. View full abstract»

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  • New infrared laser lines in argon, krypton, and xenon

    Page(s): 683 - 684
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    Fourteen new infrared laser transitions in Ar, Kr, and Xe ranging from 3.725 \to 17.233 \mu m are reported. All of the Kr laser transitions and all but one of the Ar and Xe transitions have upper levels in the s or d state: the majority of the transitions satisfy the condition \Delta K = \Delta J . Identification of a previously observed, unidentified laser line at 5.804 μm in Ar is given. View full abstract»

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  • Improved two-wavelength demultiplexing InGaAsP photodetector

    Page(s): 601 - 603
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    The structure of the previously reported InGaAsP two-wavelength demultiplexing photodetector has been inverted to circumvent fabrication problems associated with dissolution of the lower-bandgap quaternary layer during the LPE growth of subsequent higher bandgap layers. In addition, lower doping levels have been achieved in the LPE layers. The result of these modifications has been devices with greatly improved optical and electrical characteristics. The long-wavelength cutoff has been extended to 1.6 μm. View full abstract»

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  • Frequency locking by injection in dye lasers: Analysis of the CW and delta pulse regimes

    Page(s): 653 - 660
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    Experimental studies of frequency locking by injection are performed using a nanosecond and a microsecond pulse duration dye laser. Either of these two lasers can be used as the master oscillator, and the experimental conditions then lead to two different injection regimes defined as the CW and the delta pulse regime. In both regimes, the locking efficiency, which is measured as a function of the injected flux of the injected wavelength and of the time delay between the two pulses, reaches a value close to unity when the injected flux present in the forced oscillator cavity is at least equal to 10 W · cm-2. An analytical relation is derived to explain the experimental results. The use of the injection locking technique to probe the progressive narrowing of tuned dye lasers and to monitor the occurrence of the laser threshold is emphasized. View full abstract»

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  • Direct index measurements of diffused channel waveguides

    Page(s): 634 - 640
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    A nondestructive method is described for obtaining information about the refractive index profiles of diffused channel waveguides of the type used in integrated optics. The method assumes that the index profile can be approximated as a product of two functions each of which depends on one of the two transverse coordinates. By observing the focusing effect, which the waveguide has on collimated light passing through it transversely to its axis, the shape of the index profile in a direction parallel to the surface of the substrate can be obtained. From measurements of the reflection coefficients we obtain the refractive index at the upper surface of the waveguide. By combining the two measurements the effective depth of the waveguide can be calculated. Results of measurements on multimode and single-mode waveguides formed in glass and lithium niobate are presented. View full abstract»

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  • Reduced spontaneous carrier lifetime in narrow stripe geometry GaAlAs DH lasers

    Page(s): 596 - 598
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    We examined the dependence of spontaneous carrier lifetime on the stripe width in internally striped-planar GaAlAs DH lasers by measuring the turn-on delay time of lasing emission under step current injection. The measured carrier lifetime reduces in narrow stripe lasers. Reasonable interpretation of the results can be given by the increased carrier density at threshold which results from the increasing waveguide loss and the carrier loss by out-diffusion in narrow stripe lasers. There is also given another explicit explanation on the reduced carrier lifetime by using the rate equation. View full abstract»

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  • Multimode and single-mode fiber connectors technology

    Page(s): 618 - 627
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    Various optical fiber connectors using a graded-index fiber have been fabricated and good performances have been obtained during field trial tests. The average connection loss of a C -type, plug-in type, and U -link connector has been found to be 0.4, 0.34, and 0.62 dB, respectively. A new field assembly (FA) type connector using a precision made ceramic capillary has also been developed. This FA type connector is fabricated for use with single-mode fibers, and has a connection loss of 0.56 and 0.52 dB at 0.85 and 1.3 μm, respectively. By using coupling experiments between laser diodes and single-mode fibers, a laser module with a coupling loss of 1.8 dB under optimum alignment conditions has been fabricated. View full abstract»

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  • New techniques for determining vibrational temperatures, dissociation, and gain limitations in CW CO2lasers

    Page(s): 668 - 676
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    We have developed an accurate method of determining vibrational temperatures and populations in CO2laser discharges. Our technique involves the use of both the regular 00 ° 1 and sequence 00 ° 2 laser transitions as probes of a CO2laser amplifier. We have been able to separately investigate the quantitative effects of gas heating, dissociation, and ν3mode excitation efficiency on the small-signal gain in typical CW CO2lasers. In general we find that the maximum gain attained in a typical flowing gas CW CO2laser is limited by dissociation of CO2at high discharge currents. To investigate the more fundamental limitations on the gain, we used a short discharge tube with fast flow rates. Contrary to many previous results, we find that thermal effects play a somewhat secondary role in the discharge dynamics, and that the lower laser level populations are small under all discharge conditions. Our results show that the chief limitation on gain in CW CO2lasers is the "saturation" of the ν3mode vibrational temperature T3at high discharge currents. This saturation effect is observed for a wide range of gas mixtures and pressures, and has been studied in detail. Gain coefficients as high as 3.3 percent/cm have been obtained in a conventional 1-cm bore CW discharge tube. We also report preliminary results of an experiment which uses a tunable diode laser to measure gain on a large variety of transitions in a CO2discharge. The diode laser measurements give a striking confirmation of the results described above, and provide the first direct experimental evidence that a Boltzmann distribution exists in the vibrational modes of discharge excited CO2. View full abstract»

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  • Optically pumped CHClF2and C2H5I submillimeter wave lasers

    Page(s): 592 - 594
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    Submillimeter wave laser action is reported for the first time in chlorodifluoromethane and ethyl iodide. Five new laser transitions have been produced by optical pumping with a chopped CO2laser. 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