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Quantum Electronics, IEEE Journal of

Issue 9 • Date September 1976

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Displaying Results 1 - 12 of 12
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • Antisymmetric taper of distributed feedback lasers

    Page(s): 532 - 539
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    In a distributed feedback (DFB) laser with spatial index modulation, an antisymmetric taper of the feedback parameter,k, removes the threshold degeneracy, which is characteristic of uniform structures, and leads to one mode of particularly low threshold. Exact solutions are presented for the special case of an antisymmetric step ofk. An approximate perturbation method is developed which gives simple expressions for the threshold gains, and externalQ's of some tapered distributed feedback structures. The method is tested against two exact solutions, the uniform, and the stepped-kDFB laser. It is shown that the threshold of the stepped-kDFB laser is the lowest of any structure with an antisymmetric taper and a prescribed maximum value of|k|. View full abstract»

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  • Far-infrared laser oscillations from H2CO

    Page(s): 547 - 549
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (399 KB)  

    Lasting laser oscillation was obtained from H2CO vapor with a longitudinal-flow tube. Ten lasing lines, including six new lines, have been observed in the pressure range of 0.18-0.35 torr. The optimum conditions were 2.5-7.1 kV and 2.5 Hz for excitation voltage and pulse repetition rate, respectively. The pulse shape of the lines was observed by an Ni-W diode. View full abstract»

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  • A simplified method for determination of the induced-emission cross section of neodymium doped glasses

    Page(s): 551 - 554
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    Induced-emission cross sections for the4F_{3/2}rightarrow4I_{11/2}and4F_{3/2} rightarrow4I_{13/2}transitions of Nd3+in glasses can be determined with a satisfactory precision by a simplified method, based on the Judd-Ofelt theory, from the measurement of the integrated absorbance of the 750-nm band and of the effective linewidth of the fluorescence band. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Saturated spectroscopy applied to Xenon at 3.5 µm

    Page(s): 543 - 547
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    We report the observation of the xenon isotope spectrum using saturation spectroscopy on a gain cell external to a He-Xe laser. Six resonances centered about 3.508μm are observed over the limited tuning range of the laser. These resonances are assigned to the Xe128Xe130Xe131Xe132Xe134and Xe136isotopes. The observed homogeneous linewidth is 9 ± 1 MHz, and the pressure broadening of the homogeneous linewidth is experimentally determined to be 71 ± 20 MHz/ torr. View full abstract»

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  • Tunable two-wavelength mode locking of the CW dye laser

    Page(s): 554 - 555
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    Tunable model-locked laser output is achieved at two wavelengths with a CW dye laser containing a rhodamine 6G and a cresyl violet jet. Rhodamine 6G is pumped by a mode-locked argon laser. Output pulses of 4-5 ps duration are obtained. View full abstract»

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  • Efficient generation of continuously tunable coherent radiation in the 2460-2650-Å spectral range

    Page(s): 555 - 556
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    Continuously tunable coherent radiation in the 2460- 2650-Å spectral range has been achieved by second harmonic generation (SHG) of a dye laser in a 90° phase-matched ADP crystal, temperature tuned between-116°C and 52°C. The 8.4-percent conversion efficiency obtained at a fundamental power of 9.6 kW is approximately 5 times larger than that reported earlier for SHG at these wavelengths. View full abstract»

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  • Optically pumped epitaxial GaAs waveguide lasers with distributed Bragg reflectors

    Page(s): 549 - 551
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    Fabrication and characteristics of epitaxial waveguide lasers with distributed Bragg reflectors are described. GaAs-(GaAl)As double-layered structures were grown by conventional liquid-phase-epitaxy (LPE) technique. Periodic corrugations were made by chemical etching through a photoresist grating mask. Laser action with clearly defined logitudinal modes was observed under optical pumping at liquid-nitrogen temperature. View full abstract»

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  • Controlled energy extraction and sharp nanosecond pulses from an HF amplifier

    Page(s): 556 - 558
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    We report complete spatial control of laser energy extracted from an electron-beam-initiated HF amplifier. Control was achieved by application of a weak oscillator beam, which, by extraction of all of the available energy, overcame amplified spontaneous emission. In a separate experiment, temporal control was also demonstrated. Short (4-ns) sharp (contrast ∼20) amplified pulses were obtained by rapid polarization rotation and selective reflection in the amplified beam. View full abstract»

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  • Fifth-harmonic generation in isotropic media

    Page(s): 521 - 531
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    This paper presents a theoretical study of fifth-harmonic generation (FHG) in an isotropic media. Two schemes are discussed-cascade generation in which the fifth harmonic results from successive nonlinear interactions in two separate elements, and direct generation where the fifth harmonic is produced in an isotropic media with third-and fifth-order nonlinear susceptibilities. In the plane-wave approximation almost full conversion of the pumping energy into the fifth harmonic is found to be possible. FHG with a focused Gaussian beam is also investigated. To determine the optimum conditions for FHG in the cascade scheme, the theory of four-wave mixing of light beams with arbitrary confocal parameters and waist locations is developed. In media with third- and fifth-order nonlinearity, the fifth harmonic results from step and direct processes. The interference between these two processes is discussed. Numerical calculations are presented for metal vapor-gas mixtures and Nd:glass laser pumping radiation. View full abstract»

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  • Discharge pumping of dye vapors

    Page(s): 539 - 542
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    We report the results of a study of discharge-excited dye vapors. For 20 dyes, fluorescence output was measured as a function of buffer gas, temperature, and discharge parameters. Although fluorescence efficiencies as high as 6 percent were obtained at low power levels, saturation effects limited the output fluorescence to values corresponding to gains of less than 0.2 cm-1. 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