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Quantum Electronics, IEEE Journal of

Issue 4 • Date April 1986

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Displaying Results 1 - 18 of 18
  • [Front cover and table of contents]

    Publication Year: 1986 , Page(s): 0
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    Freely Available from IEEE
  • Fiber optics: Devices and systems

    Publication Year: 1986 , Page(s): 581
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    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
  • Reflectivity of TE modes at the facets of buried heterostructure injection lasers

    Publication Year: 1986 , Page(s): 498 - 500
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    The mode reflectivity of narrow stripe geometry buried-heterostructure GaAs/GaAlAs lasers was computed taking into account lateral confinement, as well as transverse confinement. The reflectivity was found to increase with increasing of the junction width, up to the broad-area value, in contrast to results obtained previously. The differences between the lowest computed reflectivities and the broad-area values were found to be 10-25 percent. Lateral confinement should therefore be considered in cases where single-mode confinement and mode reflectivity are important. View full abstract»

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  • Stimulated vibrational Raman scattering in HD

    Publication Year: 1986 , Page(s): 520 - 521
    Cited by:  Papers (1)  |  Patents (2)
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    This letter reports an observation of stimulated vibrational Raman scattering in HD gas. The Raman threshold data are compared to those of H2under similar conditions, and the difference in their gain coefficients is discussed. View full abstract»

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  • Coupled mode solutions of multiwaveguide systems

    Publication Year: 1986 , Page(s): 528 - 534
    Cited by:  Papers (28)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2056 KB)  

    We present a new coupled mode formulation for guided wave propagation in an array of N -parallel waveguides and solve the resulting matrix differential equations. Analytic results for two- and three-waveguide systems are derived and several examples of three waveguide couplers are given. In particular, we show that field amplitudes in the case of asymmetrical excitation of a three-waveguide coupler are not periodic functions along the propagation direction as previously had been supposed. View full abstract»

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  • Frequency modulation characteristics of coupled stripe laser diode array

    Publication Year: 1986 , Page(s): 513 - 516
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1192 KB)  

    Time-dependent changes in the cavity resonance frequency were measured in a ten-element gain-guided coupled stripe array using a new technique based on injection locking. Sensitivity of the frequency to changes in the array current was 0.7 GHz/mA at dc and 0.04 GHz/mA for 1.0 MHz sine-wave modulation. The current-to-frequency modulation transfer function for the array was determined, and it was concluded that the transition from thermal to carrier-induced frequency modulation occurs in the region between 105and 106Hz. View full abstract»

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  • Cd recombination laser in a plasma generated by an electron beam

    Publication Year: 1986 , Page(s): 509 - 512
    Cited by:  Papers (5)
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    Laser action was obtained in the 1.40, 1.43, and 1.65 μm lines of CdI following electron-ion recombination in a plasma generated by an electron beam. Lasing does not occur during the excitation pulse due to the electron impact population of the laser lower levels. In this plasma, supercooling of the electrons is achieved under stationary conditions, and efficient CW recombination laser action might also be possible on lines in which the lower level is not significantly populated by electron collisions. Seven new infrared laser lines in CdII are also reported. View full abstract»

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  • Laser interferometric studies of laser-induced surface heating and deformation

    Publication Year: 1986 , Page(s): 569 - 573
    Cited by:  Papers (1)
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    A Mach-Zehnder laser interferometer has been used to study the time-resolved deformation of metal and semiconductor surfaces caused by irradiation with the second harmonic of an Nd : YAG laser. The surfaces of thick and thin plates have been studied. The signals obtained for thick sample surfaces are compared to those derived from theory based on thermal expansion caused by heating of the surface by the laser pulse. For thin plates, mechanical vibrations due to induced thermal stress are observed and compared to theory. View full abstract»

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  • Quantum noise in superluminescent diodes

    Publication Year: 1986 , Page(s): 522 - 527
    Cited by:  Papers (15)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2016 KB)  

    Intensity noise in a superluminescent diode (SLD) has been studied over the frequency range from 100 Hz to 2 MHz. The noise which dominates at low frequencies (< 50 kHz) is superceded by a flat "white noise" spectrum at higher frequencies (> 500 kHz). A more extensive investigation has been carried out in this higher frequency regime, where the intensity noise is assumed to result from quantum fluctuation effects. For a given SLD driving current, the excess noise power is found to be a linear function of photodetector current to the maximum observed level of 12 dB. These results agree well with the behavior predicted by a quantum amplifier model for the SLD. View full abstract»

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  • Varieties of leaky waves and their excitation along multilayered structures

    Publication Year: 1986 , Page(s): 544 - 551
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2744 KB)  

    The varieties of leaky waves supported by planar multi-layered structures are determined for the general case of an arbitrarily stratified layer placed between a substrate and a superstrate. For lossless media in the substrate and superstrate, but for either lossy or lossless layers, a total of eight different leaky-wave fields are found. These various types of leaky waves are distinguished by forward or backward traveling characteristics on the one hand, and by similar (co-leaky) or different (contra-leaky) power-flow behavior in the two exterior regions on the other hand. The co-leaky waves can exist if the superstrate and substrate consist of either the same or different media, but the contra-leaky waves appear only if these media are different. By investigating the field generated by realistic sources, it is shown that only four out of the eight leaky-wave varieties can be excited so that the other four should have little physical significance. However, the excitable four types of leaky waves can be strongly generated by suitable sources, and three of them have already found interesting applications in the coupling of beams into (or out of) layered structures and in the guiding of plasmon waves by thin metal films. View full abstract»

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  • XeCl laser power enhancement with an external ultraviolet laser

    Publication Year: 1986 , Page(s): 501 - 504
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    Enhancements in the output energy of an XeCl laser of more than 50 percent have been observed by injecting 2-43 mJ of 308 nm laser radiation into the resonator 10-150 ns prior to the emergence of the final XeCl pulse. This effect is a strong function of the time delay ( \Delta t ) between the two lasers and is most pronounced when the injected (external) pulse precedes the XeCl laser pulse by 45 ns. For |\Delta t| l\sim 100 ns, the external radiation appears to be simply "seeding" the XeCl laser cavity which allows the second laser to reach threshold earlier and thereby improve its extraction efficiency. For 100 l\sim |\Delta t| l\sim 150 ns, the enhancement may to arise from the depletion of the number density of an impurity molecule which absorbs strongly at 308 nm. View full abstract»

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  • Accuracy of Petermann's K-factor in the theory of semiconductor lasers

    Publication Year: 1986 , Page(s): 505 - 508
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    Petermann has proposed that the classical formula for the linewidth of a laser be multiplied by a factor K \gg 1 in the case of gain-guided semiconductor lasers [1]. The concept of power in the mode used by that author, however, is not well defined in a waveguide with gain [2], and his theory is therefore opened to question [3]. The analysis given here avoids this difficulty and nevertheless agrees with Petermann's result. This is because spatial mode filtering is strong in oscillating lasers. View full abstract»

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  • Analyses of mode-hopping phenomena in an AlGaAs laser

    Publication Year: 1986 , Page(s): 535 - 543
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2680 KB)  

    Intensity fluctuations of the longitudinal modes of a 0.8 μm AlGaAs laser were precisely measured during the occurrence of hopping between two modes. It was found from this result that mode hopping follows the stochastics of a Poisson process. The frequency of mode hopping was measured as f_{c} = [\exp [-95(I/I_{th} - 1)]] \times 10^{7} (Hz). where I/I_{th} is the injection current normalized to its threshold value. Results of analog computer simulations showed that spontaneous emission worked as a triggering force for mode hopping. Results of the analysis based on the Fokker-Planck equation were compared to the experimental results, from which the root-mean-square value of the fluctuating electric field of spontaneous emission was estimated as 2.3 \times 10^{2} (V/m) \leq\langle \sim{E}_{N} \leq 3.2 \times 10^{2} (V/m). It is concluded that an effective reduction of mode hopping is achieved if the laser is operated at a higher bias or if the coupling constant between the two modes is increased. View full abstract»

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  • Measurements of heating and energy storage in flashlamp-pumped Nd:YAG and Nd-doped phosphate laser glasses

    Publication Year: 1986 , Page(s): 574 - 580
    Cited by:  Papers (16)
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    We have experimentally measured the energy stored and the heat generated in flashlamp-pumped Nd:YAG and six different commercially available Nd-doped phosphate glasses. We find that the normalized heating parameter X , defined as the heat deposited per unit stored energy, is 1.5-2 times the value expected from the known spectroscopy of the Nd ions in these hosts and the emission spectrum of Xenon flashlamps. We discuss the heat sources in Nd-doped glasses. Using a theoretical model, we calculate the influence of Nd concentration, flashlamp pulse length, and current density on X , and we point out the effects of X on practical laser designs. View full abstract»

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  • Approximate analysis of gain saturation of a distributed feedback laser with end reflectors

    Publication Year: 1986 , Page(s): 517 - 519
    Cited by:  Papers (10)
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    An approximate method for the analysis of distributed feedback lasers is presented. An expression for the small-signal gain coefficient αoNas a function of the output power PNoutnormalized to the saturation power Ps, coupling coefficient k , complex reflectivity of the end reflectors R , and length of the laser L is obtained. The results are found to be in good agreement with published computer solutions. View full abstract»

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  • Thermally induced degenerate four-wave mixing

    Publication Year: 1986 , Page(s): 552 - 562
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3736 KB)  

    Time-dependent aspects of thermally stimulated degenerate four-wave mixing (DFWM) in absorbing liquid solutions have been theoretically investigated through a coupled electromagnetic-hydrodynamic theory originally formulated to study stimulated scattering processes. The various time scales involved in the interaction (including those characteristic of acoustic modes and thermalization effects) are identified and relevant laser and media parametrical relations are sorted out. Suitable approximation regimes are then outlined, corresponding to specific experimental situations of interest and allowing for relatively simple and tractable analytic relations to be derived. In particular, the effects of finite rise time of thermalization were studied and found to lead to a possibly strong angular dependence in the conjugate reflectivity. Acoustic modes and their influence on the process efficiency were also investigated. The calculations culminate in a set of guidelines for optimizing conjugation efficiencies, through judicious choice of dye-solvent combinations, "read" pump time delays, experimental arrangements, and laser pulse parameters. View full abstract»

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  • Experimental investigations of thermally stimulated degenerate four-wave mixing

    Publication Year: 1986 , Page(s): 563 - 568
    Cited by:  Papers (1)
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    Results of experimental investigations aimed at testing efficiency-related aspects of thermally induced degenerate four-wave mixing in absorbing solutions are reported. The effects of fluorescence, read beam time delay, and forward beam angle variations are measured and shown to strongly influence the achievable thermal grating diffraction efficiency. In particular, a strong decrease of conjugation efficiency is observed as a function of increasing angle between the forward beams. Conjugate beam diffraction efficiencies as high as 17 percent were measured for the dye RhB in acetone. Based on our observations, we predict that still higher conjugation efficiencies will be feasible under optimal conditions with the thermal grating mechanism. 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