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Quantum Electronics, IEEE Journal of

Issue 12 • Date December 1967

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Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1967 , Page(s): 0
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  • Characteristics of a gas laser amplifier

    Publication Year: 1967 , Page(s): 649 - 655
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    Characteristics of a gas laser amplifier are theoretically analyzed by employing Lamb's model. A wave equation in the time domain is obtained when traveling waves in the positive and negative directions are present simultaneously in the nonlinear active medium. The wave equation which contains linear and third-order nonlinear terms is applicable to any spectral construction of the incident signal, such as discrete, continuous, and mixed. An approximate solution of the wave equation is obtained in the frequency domain. Some characteristics of a kernel which appears in the frequency-domain representation are discussed. As an application of the theory, characteristics of one- and two-frequency amplifiers are calculated and compared to previous analysis. View full abstract»

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  • A push-pull optical amplitude modulator

    Publication Year: 1967 , Page(s): 664 - 667
    Cited by:  Papers (3)
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    A push-pull optical amplitude modulator is described, and some experimental results are presented. The modulator is an interferometer with phase modulators in each arm. The design gives good temperature stability and allows a reduced modulating voltage by using a transverse modulating field. The use of a Köster's beamsplitting prism provided a compact practical design for the experimental KDP modulator. The modulator held a null in the output of 20 dB below the input for periods of one hour. The frequency response out to 30 MHz and the pulse response of the modulator were measured. Strong piezoelectric resonances were observed. The advantages of the push-pull modulator design for use with LiNbO3or LiTaO3are pointed out. View full abstract»

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  • A proposal for internal electrooptic intensity and frequency modulation of diode lasers

    Publication Year: 1967 , Page(s): 667 - 674
    Cited by:  Papers (1)  |  Patents (1)
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    Modulation of a GaAs diode laser by a GaP electro-optic diode modulator internal to the laser cavity is proposed. Application of a reverse voltage to the modulator diode changes the state of polarization of the oscillating mode. One polarization component of the mode is efficiently coupled out of the cavity by reflection off a Brewster angle laser diode face. Solutions of the threshold equations for the mode frequencies, threshold gain, and the amplitude ratio and the relative phase of the polarization components of the oscillating mode exhibit novel behavior. This allows the laser-modulator combination to be used as either an intensity or a frequency modulated source. This frequency modulation regime in a coupling modulation configuration is an unexpected result and can be applied to other types of lasers. Calculations of the modulation characteristics based on measured properties of the GaP modulator diodes are presented. Operated as a Gürs-Müller coupling modulator (intensity modulation) the device could produce a depth of intensity modulation over 50 percent with a bandwidth of 1 to 3.5 GHz while dissipating only 0.1 watt in the modulator. Operated as a pure frequency modulator the device could have a 2.5 GHz bandwidth, again with 0.1 watt modulator dissipation. The modulator diode can also be used to produce pulse-code modulation. Up to one gigabit per second could be produced with the same modulator dissipation. View full abstract»

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  • Bibliography of laser devices

    Publication Year: 1967 , Page(s): 674 - 682
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    This bibliography compiled during the period from January, 1967, through June, 1967, contains 223 references which are divided into 16 categories and listed chronologically. Brief annotations are added to many references. View full abstract»

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  • An approximate linewidth determination method and the magnetic-field tunable stable spectrum of the argon laser

    Publication Year: 1967 , Page(s): 691 - 693
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    First Page of the Article
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  • Diffraction-limited emission of CW ruby lasers with Czochralski material

    Publication Year: 1967 , Page(s): 694 - 695
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  • Observation of HCN millimeter absorption in cyanide laser discharge

    Publication Year: 1967 , Page(s): 696
    Cited by:  Papers (2)
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1967 , Page(s): 0
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  • Calculations of intrinsic threshold for TE and TM mode in GaAs laser diodes

    Publication Year: 1967 , Page(s): 656 - 662
    Cited by:  Papers (6)
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    The theoretical calculations presented are similar to those of other authors. The intrinsic threshold of laser diodes is computed on the basis of an electromagnetic propagation calculation. The diode properties are approximated by a sandwich structure for dielectric constant and conductivity. This model differs from the earlier ones by assuming a triangular distribution of dielectric constant and a similar one for the conductivity. In particular, however, allowance is made for a displacement of the peak of the dielectric constant relative to the maximum of inversion, a fact that should be expected from the details of the injection mechanism. The most important result of the calculation is a predicted lower threshold for the TM mode under a wide variety of conditions. This polarization is indeed found in diodes made from dislocation-free GaAs in which laser emission occurs in terms of a relatively wide homogeneous ribbonlike near field. View full abstract»

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  • Measurement of the relaxation time of the Eastman 9740 bleachable dye

    Publication Year: 1967 , Page(s): 696 - 697
    Cited by:  Papers (8)
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    An upper limit of between 25 and 35 ps has been determined for the relaxation time of the Eastman 9740 bleachable-dye Q -switch solution. The measurement was made by determining the time dependence of the transmission of the dye cell inside a mode-locked Nd:glass laser, using a delayed, attenuated pulse from the same laser as a probe. View full abstract»

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  • Linear electrooptic effect in HgS (Cinnabar) at 0.63 and 3.39 microns

    Publication Year: 1967 , Page(s): 695
    Cited by:  Papers (2)
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    Nonlinear optical properties of HgS have been of interest lately. The electrooptic effect has been measured in a natural crystal and values for the two independent coefficients are reported here at wavelengths of 0.63 and 3.39 microns. The results agree well with predictions of purely electronic theories, but the wavelength dependence indicates an appreciable contribution of ionic motion to the optical polarizability. View full abstract»

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  • Stimulated Raman scattering in quartz

    Publication Year: 1967 , Page(s): 693 - 694
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    Stimulated Raman scattering (SRS) from infrared-active phonons in quartz is discussed. The scattering is concluded to be from a different region of k space than that previously stated in the literature. The possibility of producing a broadly tunable parametric oscillator via SRS in quartz is viewed with pessimism. View full abstract»

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  • On the theory of a Zeeman laser

    Publication Year: 1967 , Page(s): 662 - 664
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    The theory of an optical maser in the presence of an external static magnetic field has been discussed recently by several authors. It is shown here that a considerable simplification of the theory results when one uses a tensor operator expansion of the density matrix describing the system. View full abstract»

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  • Stark effect produced frequency shifts in the helium-neon laser

    Publication Year: 1967 , Page(s): 690 - 691
    Cited by:  Papers (1)
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    Charged-particle diffusion theory of the positive column of a gas discharge predicts the establishment of a radial electric field, which by the second-order Stark effect produces a shift of the atomic line center in a single-frequency helium-neon laser. These frequency shifts are estimated with a simple theory. The results are: i) the atomic line center is a function of radial position in the discharge tube; ii) the magnitude of the frequency shift is proportional to ( T_{e}/R)^{2} (where Teis the electron temperature and R is the tube radius); iii) the pressure dependence of the shift is via changes in Te; and iv) the frequency shifts are independent of discharge current. View full abstract»

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  • Effects of gas flow on gain of 10.6 micron CO2laser amplifiers

    Publication Year: 1967 , Page(s): 683 - 689
    Cited by:  Papers (16)
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    Small-signal gain of flowing gas CO2laser amplifiers at 10.6 microns has been optimized for media including pure CO2CO2: N2, CO2: He, CO2: CO, CO2: O2, CO2: N2: He, CO2: CO : He, and CO2: CO : N2. Optimum gain of all flowing gas systems studied increases monotonically with increasing gas flow rate. In the low CO2flow rate region, 10 < RCO2: < 50 cm3/min, gas flow enhances the gain most for systems containing N2. Results provide strong evidence that the rapid increase in gain with flow rate in CO2: N2mixtures is due to removal by convection of the dissociated product CO. For 50 < RCO2< 200 cm3/min, a slow linear increase in gain of all gas mixtures with increasing flow rate occurs and is attributed to the cooling of gas temprature by convection. A stronger dependence of gain G on amplifier bore D , viz., G \propto I/D , was obtained for flowing gas media relative to that previously observed for nonflowing gas mixtures which is consistent with the proposed mechanism of gas cooling by convection. Highest gain values obtained were 7.8 and 6.2 dB/m with the flowing gas mixtures CO2: N2: He and CO2: CO : He, respectively, in a 12 mm bore water-cooled amplifier tube. Similarities between CO2: N2and CO2: CO systems suggest that pumping of the CO2laser by resonant transfer from CO* ( \upsilon = 1 ) can be significant. 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