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Quantum Electronics, IEEE Journal of

Issue 12 • Date December 1986

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1986 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (564 KB)  
    Freely Available from IEEE
  • Editorial announcement

    Publication Year: 1986 , Page(s): 2186
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    Freely Available from IEEE
  • Semiconductors and semimetals, vol. 22, Lightwave Communication Technology, Part D - Photodetectors

    Publication Year: 1986 , Page(s): 2275
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (363 KB)  

    First Page of the Article
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  • [Back cover]

    Publication Year: 1986 , Page(s): 0
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    Freely Available from IEEE
  • Silver film-diffused glass waveguides: Diffusion process and optical properties

    Publication Year: 1986 , Page(s): 2213 - 2218
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2032 KB)  

    Diffusion of a silver film into a glass substrate in the presence of an electric field is used to fabricate a series of planar waveguides in an effort to better understand the diffusion process and to relate the process parameters to the device parameters. The results indicate that it is possible to fabricate highly multimode waveguides which exhibit no fabrication-induced surface defects and no coloration due to silver reduction provided the silver film is not depleted during the diffusion process and the diffusion temperature is low (275°C or less). In addition, scanning electron microscope (SEM) analysis and optical characterization indicate that the maximum index change in the waveguide is strongly dependent on the applied field. We demonstrate that \Delta n varies from approximately 0 to 0.075 for fields ranging from 0 to 15 V/mm, making this technique specially attractive for the fabrication of waveguide structures requiring a large, variable change in refractive index. View full abstract»

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  • Picosecond stimulated Raman generation, pump pulse fragmentation, and fragment compression in single-mode optical fibers

    Publication Year: 1986 , Page(s): 2230 - 2235
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1840 KB)  

    Pump pulse depletion has been examined for high peak power (∼ 100 kW) 90 ps pulses from a Q -switched and mode-locked Nd:YAG laser in 4 m of single-mode optical fiber. Fragmentation of the fundamental and low Stokes Raman orders has been observed for this cascading process. Pulse compression using an interferometric technique has been carried out, obtaining compression ratios of up to times five, on these fragments which exhibited a negative frequency chirp. View full abstract»

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  • Phase-locked injection laser arrays with variable stripe spacing

    Publication Year: 1986 , Page(s): 2204 - 2212
    Cited by:  Papers (5)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2672 KB)  

    A phase-locked injection laser array is described which utilizes variations in spacing of identical lasing elements to vary the coupling between them. In general, phase-locked arrays have been fabricated as periodic structures with uniform coupling, although arrays with different element sizes have been described. An important advantage of the variable spacing array (VSA) structure over those designs is that the fundamental array mode can be readily matched to a uniform pumping profile across the entire array aperture. This allows the variable spacing arrays to be optimized for high-power operation. A coupled-mode analysis indicates that excellent matching of fundamental array mode to a uniform gain distribution can be obtained. However, for some array geometries the operation of array modes other than conventional 0 and 180° phase shift modes is enhanced. Variable spacing arrays have exhibited phase-locked behavior to CW outputs as high as 80 mW (7 elements) and single longitudinal mode operation to powers > 50 mW. Observation of the array emission patterns confirms the results of the coupled-mode analysis. View full abstract»

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  • Study of thermal effects in an Nd doped phosphate glass laser rod

    Publication Year: 1986 , Page(s): 2259 - 2265
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2456 KB)  

    Measurement of thermal effects in LHG-8 Nd:glass laser rod during the transient and the cooling phases are presented. The induced thermal lensing is determined by passing a He-Ne probe beam through the rod and measuring the changes in the intensity of the probe beam transmitted through an out-of-focus iris placed near the focal plane of an external lens. Expression for the power of the Gaussian beam transmitted through a stressed laser rod placed between two crossed polarizers is derived. The values of the induced focal length corresponding to the temperature gradient deduced from the measurements of induced birefringence, an independent observable of thermal effects are obtained. These value are found to be in fairly good agreeement with the directly measured values. View full abstract»

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  • Small signal analysis of frequency chirping in injection-locked semiconductor lasers

    Publication Year: 1986 , Page(s): 2219 - 2223
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1400 KB)  

    A theoretical and experimental investigation of frequency chirping in injection-locked semiconductor lasers under a condition of small signal modulation is presented. It shows that a substantial reduction of frequency chirping can be obtained which, however, is effective only up to modulation frequencies of the order of the locking bandwidth and is strongly dependent on the frequency detuning between master and slave. View full abstract»

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  • Dynamics of thermally induced optical bistability

    Publication Year: 1986 , Page(s): 2224 - 2229
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1848 KB)  

    The steady-state model of thermally induced optical bistability, presented in a previous paper, is extended to describe transient phenomena. A nonlinear integral equation is derived which can be readily solved for arbitrary time dependence of the input power. We apply the model to switching processes in bistable ZnSe interference filters. The corresponding experimental results are found to be in good agreement with the theoretical predictions. View full abstract»

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  • Direct optical pumping of high-pressure CO2and N2O lasers with a pulsed HF pump laser

    Publication Year: 1986 , Page(s): 2236 - 2241
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1984 KB)  

    Pulsed HF laser radiation has been used for direct optical excitation of CO2and N2O lasers at 10 and 5 atm gas pressures, respectively, which are the pressures required for continuous laser frequency tuning between the line centers in these gases. The maximum demonstrated quantum efficiency is about 14 percent, which seems to be limited by the formation of pressure waves in the gas, in addition to losses in the resonator optics. We find that quantum efficiencies close to unity are theoretically feasible with a low-loss resonator, and by using a sufficiently short pump pulse to avoid a serious influence from pressure waves. The excitation scheme can be used with any of the CO2and N2O laser isotopes. View full abstract»

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  • Experimental study of a ring dye laser with an external retroreflecting mirror

    Publication Year: 1986 , Page(s): 2251 - 2258
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2248 KB)  

    We have experimentally studied the forward-to-backward intracavity intensity ratios for a rhodamine 6G ring dye laser with an external retroreflecting mirror. The experiments were conducted at several wavelengths, degrees of excitation, and cavity configurations. The results indicate the large forward-to-backward ratios are only achievable near threshold and that this method is not suitable for the elimination of susceptibility gratings in the medium. View full abstract»

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  • A new monolithic composite- cavity (GaAl)As laser

    Publication Year: 1986 , Page(s): 2187 - 2190
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1032 KB)  

    A new composite-cavity (GaAl)As laser comprising a monolithically integrated pair of a laser and reflector has been developed on the basis of the chemical etching technique reported by the present authors. The rear facet of the laser and the reflector are separated by a small air gap. As a result, the new laser showed low threshold and high mode stability operation without mode jumping in a temperature range as wide as 25°C. View full abstract»

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  • Tunable near-infrared picosecond pulses from a short-cavity dye laser

    Publication Year: 1986 , Page(s): 2195 - 2199
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1784 KB)  

    We report on the generation of tunable infrared picosecond pulses by a short-cavity dye laser system consisting of a short cavity, a three-stage amplifier, and a wavelength control unit. The laser emission is temporally, spectrally, and spatially resolved. The conditions for optimum performance are ascertained, and the output characteristics important to experimental applications are determined. View full abstract»

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  • Coherent VUV generation by resonantly-enhanced nonlinear frequency mixing in Cd vapor

    Publication Year: 1986 , Page(s): 2266 - 2271
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2080 KB)  

    Broadly tunable coherent VUV radiation has been generated by two-photon resonant sum-frequency mixing in Cd vapor, using frequency-doubled Nd:YAG laser-pumped dye lasers and the three two-photon resonances 5^{1}S_{0} - 5^{1}D_{2}, - 7^{1}S_{0} , and -6^{1}D_{2} . The generated VUV having no spectral structure covers a wavelength range of 119.6-136.8 nm, and the VUV generation efficiency has been measured as a function of wavelength. Besides the tunable VUV, additional intense VUV lines were observed in a spectral range of 145.3-171.1 nm, which were generated by four-wave parametric and second-harmonic processes. The generation mechanisms of these VUV lines are discussed. View full abstract»

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  • Lifetime improvement of a visible multiline CO laser

    Publication Year: 1986 , Page(s): 2272 - 2274
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    The influence of charge capacitance, tube bore, and oxygen addition on the lifetime of a sealed-off visible carbon monoxide pulsed laser is reported. The results extend previous studies on the CW IR sealed-off CO laser. View full abstract»

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  • Digital and quasi-linear electrooptic modulators synthesized from directional couplers

    Publication Year: 1986 , Page(s): 2191 - 2194
    Cited by:  Papers (2)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1112 KB)  

    By synthesizing from cascaded directional couplers, we propose new designs to achieve digital and quasi-linear electrooptic modulations. For the digital modulator, a nearly perfect on-state or off-state can be obtained in a broad range of modulation voltages. The calculated switching voltage can be as low as the drive voltage of a conventional directional coupler. The quasi-linear modulator is achieved by adding a set of compensating electrodes to a foreshortened directional coupler. Deviation from a linear voltage-intensity relationship of less than 1 percent can be obtained over a 93.5 percent modulation depth. The calculated second harmonic and the third order intermodulation distortions are -18.3 and -32.6 dB, respectively. View full abstract»

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  • A compact wide-aperture single-mode TE-CO2laser with a low chirp rate

    Publication Year: 1986 , Page(s): 2200 - 2203
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1248 KB)  

    Single mode operation of a TE-CO2laser was obtained using a 2 \times 2 \times 30 cm gain module in a Cassegrain resonator with a Gaussian reflectivity convex mirror to produce a fundamental mode of large cross sectional area, and reducing the pressure to 375 torr in a 50 cm long cavity to limit the oscillation to a single longitudinal mode. The 70 ns gain switched pulse (FWHM) had an energy of 175 mJ, a peak power of 2.0 MW, a diffraction limited far-field, and a frequency chirp rate lower than 60 kHz/μs2. View full abstract»

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  • Stabilizing the soliton laser

    Publication Year: 1986 , Page(s): 2242 - 2250
    Cited by:  Papers (16)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2856 KB)  

    In the soliton laser, feedback from a pulse-shaping fiber enables the production of ultrafast pulses of controlled shape and width. Successful operation, however, requires maintenance of the correct optical phase of this feedback. We describe a simple but effective servo control that locks to the required phase, while simultaneously stabilizing output power. We also show that the stabilized soliton laser action involves passive mode-locking. Finally, we describe experiments that reveal, in considerable detail, how the pulse shaping takes place. In particular, our experiments show that closure is not required separately of the laser's two coupled cavities. 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