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Quantum Electronics, IEEE Journal of

Issue 5 • Date May 1984

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Publication Year: 1984 , Page(s): 0
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    Freely Available from IEEE
  • Absorptive bistability in a three-level system interacting with two fields

    Publication Year: 1984 , Page(s): 458 - 461
    Cited by:  Papers (1)
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    We have studied the case of purely absorptive bistability in a three-level system interacting with two coherent fields. The results show that in the limit where the neglect of propagation effects is justified, a tunable optical device (TOD) results. It is shown that varying the secondary field amplitude can alter the hysteresis curve of the two-level system dramatically. Under certain conditions, the secondary applied field can eliminate hysteresis and produce a tunable differential gain region. This type of adaptive behavior offers attractive possibilities for optically based analog-digital systems. View full abstract»

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  • An Indium anti-Stokes Raman laser

    Publication Year: 1984 , Page(s): 462 - 464
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (403 KB)  

    Tunable anti-Stokes Raman laser emission is reported for the first time in a medium of inverted metastable In atoms. A 451 nm input laser was up-converted to 410 nm with a photon conversion efficiency of 0.25 percent. The total tuning range was 70 cm-1. The effective storage time of the In metastable atoms was measured and a 1/e decay time of 120 ns was observed. View full abstract»

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  • Ripple structures associated with ordered surface defects in dielectrics

    Publication Year: 1984 , Page(s): 464 - 467
    Cited by:  Papers (1)
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    Laser-induced ripple structures on material surfaces have been observed by a number of workers for various materials including metals, semiconductors, and dielectrics. A model has been proposed [1] which correctly accounts for the spacing and polarization dependence of the ripples, and the association of the ripples with material defects. In this letter, experimental results which unambiguously show the association of these features with defects are presented. Quantitative measurements of laser-induced damage thresholds show a reduction of damage thresholds for surfaces with controlled linear defects aligned orthogonal to the incident laser field (as predicted in [1]). View full abstract»

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  • Narrow-band injection locking of a spectrally dense molecular laser system - HgBr (B → X)

    Publication Year: 1984 , Page(s): 499 - 503
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (683 KB)  

    Narrow-band injection locking of a discharge driven HgBr ( B\rightarrow X ) laser with \Delta \omega (FWHM) < 0.02 cm-1( \Delta \lambda < 0.005 Å) is reported. For injection fluxes as low as 3.3 W/cm2( \Delta \omega = 0.015 cm-1), approximately 80 percent of the laser output Was in this band. These results and previous work are analyzed in terms of a Simple Fokker-Planck diffusion model of the HgBr B^{2}\Sigma rotational manifold. View full abstract»

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  • Masers and lasers: An historical approach

    Publication Year: 1984 , Page(s): 540
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1984 , Page(s): 0
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    Freely Available from IEEE
  • Theoretical simulation of a pulsed HF/DF optical resonance transfer laser

    Publication Year: 1984 , Page(s): 515 - 522
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    The theoretical performance of a pulsed HF/DF optical resonance transfer laser (ORTL) is presented. The key reaction of HF/DF is the HF-DF V-V energy transfer reaction, but its rate constant has not been accurately determined so far. Therefore, in order to precisely predict the CW HF/DF ORTL experiment, the rate constant of the HF-DF V-V energy transfer reaction is determined to be dependent on V2. The relationship between gas concentration (HF, DF, and He) and pumping condition (pumping intensity and pulse width) is determined to maximize the DF small-signal gain. As a result, it is found that the pumping HF laser lines of 2.7-3.0\mu m are shifted to the ORTL lines of 3.9-4.3\mu m at a low total pulse efficiency of about 0.1 percent. View full abstract»

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  • Optical quenching and energy extraction involving metastable and dissociative states in hydrogen

    Publication Year: 1984 , Page(s): 504 - 508
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    Optical quenching of metastable molecular species and the generation of tunable broad-band stimulated emission in the UV is considered for molecular hydrogen. A detailed theoretical analysis is summarized and a Study of the optical energy extraction process, using off-resonant optical pumping from the metastable state c^{3}\Pi _{u} to the dissociative continuum state b^{3}\Sigma +_{u} , is presented. Earlier experimental work is discussed, and numerical results for the case of off-resonant pumping are presented. View full abstract»

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  • The role of cavity dispersion in CW mode-locked dye lasers

    Publication Year: 1984 , Page(s): 533 - 539
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (832 KB)  

    The contribution to dispersion of a few components of a mode-locked dye laser cavity has been evaluated. The chirp produced by the self-phase modulation within the saturable absorber has also been evaluated and compared with that resulting from the dispersive components. Cavity mirrors and blocks of transparent materials (glass or quartz) of a length exceeding 1 mm give the largest dispersion. The effect of self-phase modulation, at least for high saturation of the absorber, seems to play a comparable role. The dispersive contributions should influence the mode-locking behavior for pulses of about 100 fs or shorter. View full abstract»

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  • Line narrowing in a single-mode injection laser due to external optical feedback

    Publication Year: 1984 , Page(s): 468 - 471
    Cited by:  Papers (62)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    The effect of external optical feedback on the linewidth of a single-mode injection laser is considered theoretically. A set of three rate equations with Langevin noise sources is used to obtain the power spectrum. If the high-frequency structure in the power spectrum is ignored, the line shape is Lorentzian and exhibits broadening or narrowing depending on the external-cavity phase shift. Particular attention is paid to the line narrowing after including the effect of carrrier-induced index changes. View full abstract»

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  • Feasibility of measuring temperature and density fluctuations in air using laser-induced O2fluorescence

    Publication Year: 1984 , Page(s): 454 - 457
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    A tunable line-narrowed ArF laser can selectively excite several rotational lines of the Schumann-Runge band system of O2in air. The resulting ultraviolet fluorescence can be monitored at 90° to the laser beam axis, permitting space and time resolved observation of density and temperature fluctuations in turbulence. Experiments and calculations show that ± 1 K, ± 1 percent density, 1 mm3spatial, and 1 μs temporal resolution can be achieved simultaneously under some conditions. View full abstract»

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  • Intensity noise suppression and modulation characteristics of a laser diode coupled to an external cavity

    Publication Year: 1984 , Page(s): 492 - 499
    Cited by:  Papers (27)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (984 KB)  

    Static and dynamic properties of a GaAlAs laser diode with an external cavity (1.5-50 cm) have been studied experimentally, it is found that the optical feedback induced intensity noise is strikingly suppressed by 30 dB when a single frequency oscillation is realized with good phase matching. The threshold of modulation depth, over which intensity noise increases abruptly, has been measured as a function of the modulation frequency in a range of 10-400 MHz. It has the maximum at about 40-70 MHz and increases with the decrease of the external cavity length. On the basis of the compound cavity model the phase and gain conditions for the single frequency oscillation are discussed and the threshold modulation depth is calculated, which is shown to be in good agreement with the experimental results. View full abstract»

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  • Sub-T2optical pulse generation: Application to optically pumped far-infrared lasers

    Publication Year: 1984 , Page(s): 523 - 532
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    Several polar molecules possessing strong far-infrared (FIR) transitions have been optically pumped by a mode-locked CO2TEA laser in a single-pass configuration. All the resulting FIR pulses are shorter than the sub-T2pump pulses; subnanosecond FIR pulses are observed. These short FIR pulses exhibit lethargic gain, stimulated Raman emission, and multiple-pulse superradiance. The experimental results are modeled by numerical solution of the Maxwell-density matrix equations for two fields interacting with a three-level system. Level degeneracy is included, and the pump is described by a multimode power spectrum with a parabolic envelope, resulting in a periodic train of pulses. Variation of the detuning of the pump from resonance allows simulation of the superradiant or Raman cases. This fully coherent model, which is the major contribution of this paper, explains key experimental observations such as the noncoincidence of the Raman peak with the pump modulation minimum and the enhancement of multiple-pulse superradiance due to remanent polarization. View full abstract»

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  • Design and system requirements imposed by the selection of GaAs/GaAlAs single mode laser diodes for free space optical communications

    Publication Year: 1984 , Page(s): 478 - 491
    Cited by:  Papers (5)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1928 KB)  

    The GaAs/GaAlAs single mode laser diode has unique properties and capabilities which make it attractive for an optical communication system. The attractive features are related to its small size, semiconductor structure, ease of optical control, wavelength sensitivity and system simplicity. The diode possesses other less well known and less appreciated properties which include limited power capability, thermal and environmental sensitivity and susceptibility to static charge damage. It also has unproven reliability when operated pulsed in a digital communication system. The operating features of the diode impose restrictions on the design of the system and generate additional system requirements for the development and use of the system. The properties of the single mode laser diode are discussed and the additional system design features and system requirements identified. View full abstract»

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  • Noise properties of semiconductor lasers due to optical feedback

    Publication Year: 1984 , Page(s): 472 - 478
    Cited by:  Papers (13)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB)  

    It has been recognized for some time that reflections back into the cavity of an injection laser from a mechanically unstable external mirror cause noise in the output of the laser (reflection noise). In this paper, noise measurements are presented for index-guided lasers as functions of the output power, the degree of optical isolation and external cavity length (5-15 cm), while current modulation (using 2-4 mA at 50-200 MHz) has been used to reduce the noise levels by as much as 20 dB. It is demonstrated that the mechanism of noise reduction by modulation is the frequency modulation of the laser's spectrum and its interaction with the modes of the external cavity. It is shown that using an optical isolator can give a relative intensity noise of -110 dB while using modulation in addition can reduce this to -125 dB; the bandwidth performance of optical storage systems is discussed in terms of these two schemes. View full abstract»

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  • Frequency dependence in RF discharge excited waveguide CO2lasers

    Publication Year: 1984 , Page(s): 509 - 514
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    The performance characteristics of RF discharge excited CO2waveguide lasers are investigated as a function of the frequency of the power source in the range 50-250 MHz. In addition, the influence of frequency on the spatial and electrical properties of the discharge are studied. The laser power output, which is seen to peak at a particular frequency, may be correlated with the achievement of optimum ( E/N ) values for energy transfer to the upper laser level. The form and distribution of striations, parallel to the electrodes, are seen to be a major factor influencing laser properties. 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