By Topic

Quantum Electronics, IEEE Journal of

Issue 11 • Date November 1975

Filter Results

Displaying Results 1 - 14 of 14
  • [Front cover and table of contents]

    Publication Year: 1975 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (146 KB)  
    Freely Available from IEEE
  • Characteristics of room-temperature 2.3-µm laser emission from tm3+in YAG and YAlO3

    Publication Year: 1975 , Page(s): 874 - 881
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (841 KB)  

    The relaxation of low-lying excited states of Tm3+ions doped in YAG, YAlO3, and Y2O3due to photon and phonon emission is studied theoretically. Stimulated emission cross sections (integrated over frequency), fluorescence lifetimes, and radiative quantum efficiencies are calculated and their implications for laser operation on the 2.3-μm3F43H5line of Tm3+are discussed. The calculations, based on a few phenomenological parameters which have been determined by others, are easily generalizable to other host materials and other rare-earth (RE) ions. Room-temperature pulsed laser emission from Tm3+ions near 2.3 μm was observed on one line in Tm:Cr:YAG, and on four lines in Tm:Cr:YAlO3. Lower oscillation thresholds were generally obtained in the YAlO3 rods, consistent with the theory presented. A threshold of 31 J was obtained with a Tm:Cr:YAlO3rod at 2.274 μm. In the free-running pulsed mode, peak power levels up to several hundred watts and total output energies up to 12 mJ/pulse were observed. Other general, observed operating characteristics are discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Amplified spontaneous emission and signal amplification in dye-laser systems

    Publication Year: 1975 , Page(s): 881 - 892
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1234 KB)  

    Transversely pumped dye-laser systems are investigated theoretically and experimentally. A set of coupled rate equations for the excited-state population densities and for the photon fluxes in both directions, at all wavelengths, is presented. Both the temporal and spatial dependence of these quantities are accounted for. The equations are solved numerically for a variety of practical situations, and analytical approximations for some limiting cases are discussed. The results describe the dependence of the amplified-spontaneous-emission (ASE) output flux on pumping rate, the spectral narrowing process, and the effects of gain saturation. It is found that under practical laboratory conditions the gain of such dye systems saturates rapidly. Consequently, at high pumping rates the output varies linearly with pump intensity, and the conversion efficiency from pump to ASE photons approaches unity. The performance of dyedaser amplifiers is described by the same set of equations, and the gain characteristics of such systems are analyzed as a function of input signal intensity and pumping rate. The theoretical calculations are compared with the results of a set of experiments, and good agreement is found. The operation characteristics of a dye-laser amplifier are evaluated and utilized in the design of a narrow-band oscillator-amplifier system. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A copper laser using CuI vapor

    Publication Year: 1975 , Page(s): 919 - 920
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (194 KB)  

    A simple CuI double-pulsed laser was built. The dependence of power output on the delay between the two excitation pulses, temperature, and the type of buffer gas has been investigated. The laser pulse duration was measured. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1975 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (682 KB)  
    Freely Available from IEEE
  • Behavior of first- and second-positive emission in the N2/SF6laser

    Publication Year: 1975 , Page(s): 908 - 916
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (976 KB)  

    Experimental results for the behavior of the emission of the discharge-excited first- and second-positive bands of N2and flow-tube measurements for the deactivation of the A^{3}\Sigma \min{u}\max {+} and B^{3}\Pi _{g} levels of N2by SF6are presented. The results of both these experiments are used to explain the operating mechanisms of the N2/SF6laser. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rotational-vibrational line competition in a dual-polarization CO2laser

    Publication Year: 1975 , Page(s): 917 - 919
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    A dual-polarization CO2laser can be caused to operate such that the two polarization modes correspond, respectively, to different rotational-vibrational lines. Interline competition effects, similar to those described previously, here also result in a mode power change with optical frequency which can be utilized as a convenient and sensitive optical frequency discriminant. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the stability of modes in a laser resonator with an active medium

    Publication Year: 1975 , Page(s): 920 - 921
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

    A discussion is given on the stability of laser modes; particularly for those in active resonators having negative gain profiles. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Self-focusing phenomena in air-glass laser structures

    Publication Year: 1975 , Page(s): 863 - 866
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    The effect of the air space on self-focusing instability growth rates has been considered for glass laser systems. The situation may be viewed as a min-max problem in which the air space may be adjusted to minimize the fastest growing instability. A solution exists to the min-max problem which reduces the problem to the solution of a single transcendental equation. Solutions to this equation indicate that, at most, a 10-percent reduction in the effective value of the non-linear index of refraction can occur. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Coupling coefficients for distributed feedback single- and double-heterostructure diode lasers

    Publication Year: 1975 , Page(s): 867 - 873
    Cited by:  Papers (79)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    We compute coupling coefficients for TE modes as a function of tooth height, active layer thickness, and Bragg scattering order in single-heterostructure (SH) and double-hetetostructute (DH) distributed feedback (DFB) diode lasers for a variety of corrugation shapes. In particular, equations for rectangular, sinusoidal, and triangular shapes are evaluated; the last both in the symmetric and saw-tooth cases. It is shown that the coupling coefficient for rectangular and sawtooth gratings decreases much less rapidly with increasing Bragg order than do the sinusoidal and symmetric triangular. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fuels for a premixed pulsed HCl laser

    Publication Year: 1975 , Page(s): 921 - 923
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    HCl pulsed chemical lasing was obtained from several premixed R-Cl/HI mixtures when initiated by a transverse pulsed discharge. The relative merits of these mixtures were compared to a premixed H2/Cl2mixture. For a constant stored electrical energy several mixtures have been found which give higher specific power than the H2/Cl2system. In addition, it has been possible to run some of these improved mixtures without diluent with no laser performance degradation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Frequency-domain analysis of the mode-locked and frequency-doubled homogeneous laser

    Publication Year: 1975 , Page(s): 857 - 862
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    A frequency-domain analysis of the mode-locked intracavity frequency-doubled laser is pursued. An expression for pulse-width is derived based upon basic laser parameters and the nonlinear coupling of the frequency doubler. It is found that mode locking induces an additional loss to the cavity even in the ideal case, so that the frequency-doubled output power at optimum coupling is less than an optimally coupled fundamental frequency laser with identical losses. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Theory of the nitrogen laser excited by a relativistic electron beam

    Publication Year: 1975 , Page(s): 892 - 902
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1216 KB)  

    The 3371-Å nitrogen laser power produced by a relativistic electron beam propagating into nitrogen gas is calculated. The excitation contribution of cascade electrons is found to be negligible, compared to the excitation caused by plasma electrons drifting in the inductive electric field produced by the beam. The extensive experimental data on nitrogen are used wherever possible in the calculation, and the sensitivity of the calculation to the various input data is given. The mechanism of excitation by plasma electrons alone yields agreement within experimental uncertainty for such parameters as the peak laser power, the laser pulsewidth and delay, and the dependence of the laser power on gas pressure. For a larger drift tube radius, the plasma electron mechanism predicts higher power and a different pressure dependence, in agreement with experimental trends. In calculating the laser power, the beam propagation details, excitation to the upper and lower laser levels, collisional quenching, a threshold for amplified spontaneous emission, and excitation and deexcitation by plasma electrons are included, but coherent dipole moment effects are neglected. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Surface-wave radiation loss from curved dielectric slabs and fibers

    Publication Year: 1975 , Page(s): 903 - 907
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    A newly developed systematic procedure to calculate the real and imaginary parts of the change in propagation constant of a surface-wave mode on a curved open waveguide of general cross section is used here to determine these quantifies for the TE modes of an asymmetric slab waveguide and for all the modes of an optical fiber. Comparison of these results with the existing literature points up the care which must be taken in making approximations in this problem, since errors of significant factors in the radiation loss have been made in previous work. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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