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Quantum Electronics, IEEE Journal of

Issue 12 • Date December 1980

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1980 , Page(s): 0
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    Freely Available from IEEE
  • Eulogy to Dr. Robert V. Pole

    Publication Year: 1980 , Page(s): 1282
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  • Ultrashort laser: Lasing in MBE GaAs layer with perpendicular-to-film optical excitation and emission

    Publication Year: 1980 , Page(s): 1283 - 1285
    Cited by:  Papers (3)
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    Lasing was observed in a 4.5 μm thick GaAs MBE-grown heterostructure (0.2 μm Al0.42Ga0.58As, 4.1 μm GaAs, 0.21 μm AlGaAs). The laser was driven by pulses from a mode-locked Ar laser (514.5 nm) with a maximum of 20 W peak power in 100 ps long pulses focused to 25 μm. The lasing occured along the pump axis within a cavity defined by the coated AlGaAs surfaces. View full abstract»

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  • Comments on "Approximate calculation of leaky-mode loss coefficients for Ti-diffused LiNbO3waveguides"

    Publication Year: 1980 , Page(s): 1287 - 1288
    Cited by:  Papers (2)
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    The discrepancy between the results of "geometric-optical" [1] and "WKB" [3] analyses of the leaky-mode loss coefficient of LiNbO3:Ti anisotropic waveguide is discussed. It is shown that both methods, if correctly formulated, give essentially identical results. View full abstract»

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  • A new design of hollow cathode lasers with multiple electrodes

    Publication Year: 1980 , Page(s): 1290 - 1291
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    A new design for hollow cathode lasers, using multiple electrodes excited with an alternating power supply, is introduced and a report on their preliminary performance is given. Laser action was observed on the 781 nm transition of the Cu ion. View full abstract»

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  • Oscillator performance and energy extraction from a KrF laser pumped by a high-intensity relativistic electron beam

    Publication Year: 1980 , Page(s): 1315 - 1326
    Cited by:  Papers (5)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3642 KB)  

    A laser cell with 21 of excitation volume was used to study the electron-beam pumped KrF laser system at excitation rates of 1.8- 7.0 MW/cm3. The system was optimized as an oscillator for various mixtures of Ar, Kr, and F2at total pressures of 1000 and 2500 torr. The resulting optimum conditions gave an intrinsic efficiency (laser energy out/electron-beam energy deposited) of 12 percent for the 1000 torr total pressure mixture with an output energy of 11 J/1. An efficiency of 10 percent with an output of 40 J/1 was obtained for the 2500 torr mixture. The system was then used as an amplifier to measure the extracted power as a function of input power for the two mixtures. The small-signal gain go, the nonsaturable absorption α, and the saturation intensity Iswere determined for the two mixtures. Analysis of the data gave g0= 16-18 percent/cm, \alpha = 0.75-1.25 percent/cm, and Is= 2 MW/cm2for the 1000 torr mixture and g0= 17-19 percent/cm, \alpha = 1.0-1.5 percent/cm, and I_{s} = 9 MW/cm2for the 2500 torr mix. View full abstract»

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  • Comparison of the responsivity of W-Ni point contact MBM diodes with W-Si point contact Schottky diodes

    Publication Year: 1980 , Page(s): 1372 - 1375
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    The responsivities of the W-Ni point contact MBM diode and the W-Si point contact Schottky diode (commercial 1N23B diode) are compared at 9.5 GHz under identical conditions. The MBM diode has almost half the responsivity of the Schottky diode and was measured to be ≃20 V/W for a 550 Ω termination. The responsivity of the MBM diode decreases with an increase of the frequency. However, this is not due to the RC time constant of MBM diodes, but due to the antenna properties of the whisker and the relaxation behavior of the metallic whisker antenna. View full abstract»

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  • Comments on "Study of thermal relaxation in a repetitively pumped Nd:glass laser rod"

    Publication Year: 1980 , Page(s): 1387 - 1388
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    First Page of the Article
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  • Correction to "A new design concept for hollow-cathode white light laser"

    Publication Year: 1980 , Page(s): 1388
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1980 , Page(s): 0
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    Freely Available from IEEE
  • Efficient V-V energy transfer in a multiphoton excited mixture of SF6and CF4

    Publication Year: 1980 , Page(s): 1380 - 1387
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    Spectral and temporal measurements of infrared fluorescence (IRF) in SF6, CF4, and mixtures of SF6and CF4gases excited by a pulsed CO2laser are reported. Using the 944.2 cm-1[ P(20) ] laser line for excitation and measuring the IRF spectra between 700 and 1500 cm-1, a strong red shifted IRF peak of the ν3mode in pure SF6was found. No IRF was observed under these conditions in pure CF4. In a 13:10 mixture of SF6and CF4, two strong IRF peaks of the ν3modes, shifted to the red relative to the room-temperature fundamentals at 948 cm-1and 1283.2 cm-1, were observed. The peaks are almost equal in height and since both molecules have almost the same ν3band intensity, the present result suggests that efficient intermolecular V-V energy transfer occurs from excited SF6to cold CF4molecules. The temporal behavior of the IRF signals under high excitation ( \langle n\rangle \approx 6 ) in pure SF6exhibits two relaxation times, one of bulk cooling with \tau _{1} \approx 1 ms and the other of a V-T nature with P\tau _{2} \approx 20 \mu s . torr. In the mixture, an additional relaxation of the intermolecular V-V energy transfer process is observed with P\tau _{3} \approx 10 \mu s . torr. The red shift dependence of the IRF peaks on the degree of excitation was also measured and used to examine population distributions, specific IRF transitions, and anharmonicity parameters. View full abstract»

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  • Tunable alexandrite lasers

    Publication Year: 1980 , Page(s): 1302 - 1315
    Cited by:  Papers (11)  |  Patents (4)
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    Wavelength tunable laser operation has been obtained from the solid-state crystal alexandrite (BeAl2O4:Cr3+) over the continuous range from 701 to 818 nm. The tunable emission was observed at room temperature and above in a homogeneously broadened, vibronic, four-level mode of laser action. In this mode the laser gain cross section increases from 7 \times 10^{-21} cm2at 300K to 2 \times 10^{-20} cm2at 475K, which results in improved laser performance at elevated temperatures. Efficient 2.5 percent, low-threshold (10 J) operation has been obtained with xenon-flashlamp excitation of the 6 mm diameter × 76 mm length laser rods. Output pulses of greater than 5 J and average power outputs of 35 W have been demonstrated, limited by the available power supply. The emission is strongly polarized E\parallel b , with a gain that is 10 times that in the alternate polarization. The 262 μs, room-temperature fluorescence lifetime permits effective energy storage and Q -switched operation. Tunable Q -switched pulses as large as 500 mJ have been obtained with pulsewidths ranging between 33 and 200 ns depending on the laser gain. Laser action has also been demonstrated on the high-gain ( 3 \times 10^{-19} cm2emission cross section) R line at 680.4 nm and is also polarized E\parallel b . This three-level mode is analogous to the lasing in ruby except that the stimulated emission cross section in alexandrite is ten times larger than for ruby. View full abstract»

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  • Sealed-off continuous wave carbon monoxide laser at high temperature operation

    Publication Year: 1980 , Page(s): 1296 - 1298
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    The CO laser at 208-348 K operation is reported. Output power of 8.8 W, efficiency of 7.2 percent, and a lifetime of greater than 2500 h have been obtained. The laser lines were selected by a grating and showed oscillation on 63 lines in the 5.1109-5.9120 \mu m wavelength range were obtained. The strongest line had a power output of 1.4 W at room temperature and 1.11W at 333 K operation. At 323 K there are 33 lines with a maximum power of 220 mW for one line. View full abstract»

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  • Measuring the spot size of a Gaussian beam with an oscillating wire

    Publication Year: 1980 , Page(s): 1298 - 1299
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    It is possible to determine the spot size of a Gaussian laser beam by measuring the power of the beam with a wire of known diameter oscillating in front of the detector. It is verified experimentally that this simple method gives accurate results. View full abstract»

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  • Beam shaping to suppress phase mismatch in high power second-harmonic generation

    Publication Year: 1980 , Page(s): 1356 - 1364
    Cited by:  Papers (2)
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    A deliberate pattern of distributing the radiation energy of a high power laser can minimize the steady-state thermal gradients in a nonlinear crystal, thus permitting a large increase of the average powers of such systems. The theory of the two main techniques of beam shaping-fanning and scanning-is developed. Results of several experiments based on this theory are given. Experimental techniques, including some not yet attempted, are discussed. View full abstract»

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  • New CW FIR laser action by Stark tuning from optically pumped CH3OH and CH3OD

    Publication Year: 1980 , Page(s): 1285 - 1287
    Cited by:  Papers (2)
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    Fifteen new CW FIR laser lines are reported from Stark tuned CO2optically pumped CH3OH and CH3OD. Four new CW laser lines have also been observed from zero field optically pumped CH3OD, three with a CO2laser, and one with an N2O laser. View full abstract»

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  • High-efficiency high-power second-harmonic generation at 5321 Å in meta-nitraniline

    Publication Year: 1980 , Page(s): 1288 - 1290
    Cited by:  Patents (2)
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    Meta-nitroaniline (MNA) has been found to be highly effective for frequency doubling of a high peak power and high average power Nd:YAG laser. An energy conversion efficiency of 65 percent has been obtained in a 3 mm long crystal oriented for noncollinear type-1 phase matching. View full abstract»

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  • Isotopically selective infrared photodissociation of (trans-2-chloroethenyl)dichloroborane

    Publication Year: 1980 , Page(s): 1352 - 1356
    Cited by:  Patents (1)
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    We have prepared (2-chloroethenyl) dichloroborane and measured its dipole moment at 1.06 ± 0.05 D. Comparison of this value with ab initio quantum mechanical calculations indicates that the trans isomer has been obtained. Infrared absorptions (12 torr and room temperature) occur at 615 m, 816 s, 960 s, 992 m, 1113 s, 1147 m, 1226 s, 1572 s, and 1627 m . cm-1. Absorptions in the 960-992 cm-1range are tentatively assigned to the νasmode of the BCl2group and can be excited by a tuned CO2laser. Multiple photon absorption in this region results in isotopically selective decomposition of the compound with a quantum efficiency that suggests a chain reaction. Multiple photon isomerization which would avoid chain reactions and the resultant isotopic scrambling, was not definitively observed. View full abstract»

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  • Fabrication of an optical directional coupler of CdTe by electron beam lithography and ion etching

    Publication Year: 1980 , Page(s): 1337 - 1340
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    Various kinds of high resolution techniques such as ion etching, chemical etching, ion implantation, and electron beam lithography are studied for fabricating CdTe optical integrated circuits. It is found that the ion-etching rate of CdTe is high and has only a small dependence on crystal orientation. A special chemical etching solution for aluminum on CdTe that does not corrode CdTe and proton implanted CdTe is used for high resolution patterning of CdTe. The smooth patterns in PMMA resist produced by an electron beam exposure is replicated deep into 2.5 μm of CdTe face through the aluminum layer. Rib guides and a rib-type optical directional coupler are fabricated from planar guides by using proton implantation which makes refractive index change on CdTe face. The two-dimensional optical confinement is observed. A coupling coefficient of k \simeq 0.39 mm-1is observed in the rib-type optical directional coupler. View full abstract»

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  • Field effect semiconductor lasers

    Publication Year: 1980 , Page(s): 1300 - 1302
    Cited by:  Papers (1)  |  Patents (2)
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    A new semiconductor laser, the field-effect semiconductor (FES) laser, in which the both sides of the active region are surrounded by the burying layers with the reverse-biased p-n junctions is proposed. The proposed FES laser is a Q -switching device based on the direct control of laser beam intensity by the internal loss modulation through the field effect. The structure design and the operating principles of the device are discussed. Numerical solution shows that a pulsewidth shorter than 30 ps can be obtained. View full abstract»

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  • Laser gyro at quantum limit

    Publication Year: 1980 , Page(s): 1376 - 1379
    Cited by:  Papers (6)  |  Patents (2)
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    We show that a certain fundamental limit applies to the accuracy of all optical rotation sensors which use laser light as a probe. We derive this fundamental rotation-rate uncertainty from the Heisenberg uncertainty relations and Glauber's minimum uncertainty states. The same relationship is obtained from a spontaneous-emission noise formulation. We present experimental data on a (nondithered) four-frequency ring laser gyroscope for which this limit is attained. View full abstract»

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  • Calculated-experimental evaluation of the gain/absorption spectra of several optically pumped NH3systems

    Publication Year: 1980 , Page(s): 1341 - 1346
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    Three NH3optically pumped laser systems were chosen for study wherein one pair of energy levels was the ground state ga \leftrightarrow gs transition in the 18-26 GHz range, where tunable microwave sources are available for gain/absorption probes. The objective was to experimentally evaluate the validity and accuracy of a density matrix calculation, using typical approximations, in providing a complete description for double and triple resonant (first, third, and fifth order) gain/ absorption spectra. It was demonstrated that gain/absorption peak frequencies could be calculated to better than 10 MHz, absolute gain/absorptions to within a factor of 2 to 3, and M -split linewidths for counterpropagating pumps to ±2 MHz. At pump intensities above 100 kW/cm2, most of the M -split gain/absorption peaks could be well resolved. View full abstract»

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  • Very short far-infrared pulses from optically pumped CH3OH/D, CH3F, and HCOOH lasers using an EQ-switched CO2laser as a pump source

    Publication Year: 1980 , Page(s): 1347 - 1351
    Cited by:  Papers (1)
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    Very short far-infrared (FIR) pulses were generated from optically pumped CH3F, CH3OH/D, and HCOOH lasers using a Q - switched, current pulsed (200 mA, 100 μs), low pressure (20 torr) CO2laser as a pump source. Values of 20 ns for the rise time and 50 ns for the decay time of the FIR pulses have been observed. The dependence of the FIR pulse shape parameters, i.e., rise time, decay time, and pulse buildup time, on the width of the pump pulse and the pressure of the molecular gas have been investigated experimentally. Due to the regular pulse shape, high repetition rate (350 Hz), high peak power (≳1 W), and broad spectral range ( \lambda = 100-500 \mu m), the pulses are very useful for purposes of solid-state and molecular time resolved spectroscopy. View full abstract»

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  • Pressure dependence of the infrared laser lines in barium vapor

    Publication Year: 1980 , Page(s): 1294 - 1296
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (960 KB)  

    We have studied nine laser transitions in Ba vapor at wavelengths between 1.13 and 3.05 μm. Three of these laser lines have not been reported previously. The relative intensities of the four strongest transitions (1.13, 1.50, 2.55, and 2.92 μm) vary with buffer gas pressure, suggesting that collisional deexcitation of the 6p1P1state occurs at higher pressure and is the main mechanism populating the upper states of the 2.55 and 2.33 μm lines. View full abstract»

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  • Stimulated spin-flip scattering, photoluminescence, and magnetoabsorption in n-type Hg0.89Mn0.11Te

    Publication Year: 1980 , Page(s): 1365 - 1371
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    Stimulated spin-flip scattering has been observed for the first time in Hg0.89Mn0.11Te. The Lande g -factor and effective mass of the conduction electrons in this material have been determined from scattering and magnetoabsorption measurements. The data yield a scattering cross section which agrees reasonably with the theoretical expectation. By the use of different laser frequencies, the effect of resonance enhancement of the cross section was observed. The stimulated scattering was observed with polarizations additional to those allowed by the selecton rules of a single-particle process. Photoluminescence was also observed which appeared to be stimulated. It was found to involve localized states 12-15 meV above the valence band. 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