IEEE Journal of Quantum Electronics

Volume 13 Issue 6 • June 1977

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Displaying Results 1 - 25 of 34
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Change of editorship

    Publication Year: 1977, Page(s):369 - 370
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    Freely Available from IEEE
  • CO2laser preamplifier capabilities for low-level 10.6-µm direct-detection receivers

    Publication Year: 1977, Page(s):371 - 379
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2928 KB)

    We examine the potential of CO2laser preamplifiers for sensitivity enhancement in low-level, direct-detection 10.6-μm receivers. For the condition in which a gain-dependent competition exists between the background noise and amplifier spontaneous emission noise (assuming negligible thermal noise), the analysis predicts an optimum useful SNR enhancement of only 6 dB for a blackbody ... View full abstract»

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  • A simple preionized CO2waveguide TE laser with continuous discharge electrodes

    Publication Year: 1977, Page(s):379 - 380
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    A pulsed CO2waveguide laser with two continuous wall electrodes and a simple excitation circuit has been operated. The TE double discharge is started by a fast preionizing HV pulse and is maintained by a low voltage nonselfsustaining main discharge. View full abstract»

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  • The dispersive modulator - A new concept in optical pulse compression

    Publication Year: 1977, Page(s):388 - 392
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2155 KB)

    A description of a new method of optical pulse compression, named the dispersive modulator, is given. In this device, amplitude modulation and temporal compression of light were achieved by passage through a Stark-modulated, near-resonant dispersive medium. The relationship between the dispersive modulator and the chirp compression scheme is discussed. Experimental results on modulation of 10-_... View full abstract»

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  • An atomic Rydberg state 16-µ laser

    Publication Year: 1977, Page(s):392 - 396
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1869 KB)

    A 16 μ laser operating on the 626-cm-1transition between the6D_{3/2} rightarrow 7P_{1/2}states in potassium vapor has been demonstrated. This laser features an extremely high gain, a favorable branching ratio, and a laser-enhanced cascade process. View full abstract»

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  • Single-mode TEA-CO2injection laser

    Publication Year: 1977, Page(s):396 - 398
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1229 KB)

    Single-mode TEA-CO2laser pulses have been produced on a large number of lines in thePandRbranches of both laser bands by injection into the TEA laser cavity of a few watts of CW power from an independent low-pressure CO2laser. No length stabilization or frequency matching of the two resonators is required. View full abstract»

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  • Stabilized dual-polarization oscillation in a LiNd0.5La0.5P4O12laser

    Publication Year: 1977, Page(s):398 - 400
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    Stabilized dual-polarization oscillations inc-rod LiNd0.5La0.5P4O12(abbreviated as LNLP) lasers are reported. The dual-polarization oscillation, which means the simultaneous oscillation of orthogonally polarized modes, was obtained by setting the LNLP crystal at suitable positions in the resonator without any optical device. View full abstract»

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  • Continuous 40-W UV laser

    Publication Year: 1977, Page(s):404 - 405
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    A low-pressure Ar arc discharge (length = 1.7 m, diameter = 12 mm) was used for continuous high-power generation of UV laser lines (lambda = 351.1nm, 363.8 nm). Low-loss mirror coatings and stabilization of the discharge with a magnetic field enabled a maximum output power of 40 W to be achieved from the combined lines. View full abstract»

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  • Quantum counter for far-infrared radiation

    Publication Year: 1977, Page(s):421 - 424
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1179 KB)

    Two types of three-level quantum counters, based on the Bloembergen and the inverted scheme, are discussed with respect to their application for up-conversion of far-infrared (FIR) radiation to visible light. It is reported on a tunable quantum counter of the inverted type: in optically pumped ruby, photons at 29 cm-1are absorbed by the transitionbar{E}(2E View full abstract»

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  • Interaction of two laser fields with a three-level molecular system

    Publication Year: 1977, Page(s):425 - 434
    Cited by:  Papers (130)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3503 KB)

    The rate of absorption and emission of radiation is calculated for two laser fields interacting with a homogeneously broadened, three-level molecular system. The time-dependent Schrödinger equation is used in the density matrix formalism and the laser fields are treated classically. The laser fields, at frequencies ωpand ωs, are off resonance by δp View full abstract»

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  • Assignment of laser lines in optically pumped CH3OH

    Publication Year: 1977, Page(s):435 - 441
    Cited by:  Papers (76)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1925 KB)

    A number of far-infrared laser emission lines from CH3OH, pumped by a CO2laser, have been assigned to specific energy levels of the rotation-internal rotation spectrum in the first excited CO stretch state. The assignments are based on comparison with the established model for the vibrational ground state, and on criteria concerning internal consistency, polarization, and lin... View full abstract»

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  • A high-power, narrow-linewidth, linearly pumped CH3F oscillator-amplifier system

    Publication Year: 1977, Page(s):445 - 446
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB)

    We have produced peak pulse powers of ≃0.6 MW at 496 μm, predominantly confined to the transform limited linewidth of 30 MHz. The system employed is a scaled-up version of the previously reported [1] linearly pumped CH3F oscillator-amplifier. View full abstract»

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  • Evaluation of collision frequency in high-pressure glow discharges

    Publication Year: 1977, Page(s):447 - 450
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1089 KB)

    We have used far infrared absorption techniques to measure the time resolved electron-neutral collision frequency in pulsed high-pressure glow discharges in nitrogen, helium, and CO2laser mixtures. The equilibrium collision frequency for a constant applied electric field has also been calculated as a function ofE/N, the electric field-to-gas density ratio. The measured and ca... View full abstract»

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  • Diffraction limited CW optically pumped lasers

    Publication Year: 1977, Page(s):455 - 459
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1703 KB)

    The far infrared spectral characteristics of inductive metal mesh dielectric hybrid mirrors were investigated. From experimental and theoretical studies, the mirrors were found to exhibit etalon effects due to the finite Si substrate thickness and to have two separate diffraction conditions. With grid spacinggand substrate index of refractionn, forn^{-1} < g/lambda &l... View full abstract»

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  • An optically pumped submillimeter wavelength regenerative amplifier

    Publication Year: 1977, Page(s):459 - 461
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (727 KB)

    An optically pumped regenerative amplifier has been designed to operate at submillimeter wavelengths using a waveguide cavity resonator and an interferometer coupling arrangement. Amplifier design and experimental measurements of gain are presented. View full abstract»

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  • Stimulated Raman emission in infrared excited gases

    Publication Year: 1977, Page(s):476 - 481
    Cited by:  Papers (60)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1941 KB)

    Using the pressure dependence of absorption, absorption coefficients and detunings were measured for CO2pump lines and the strong fat infrared emission in optically pumped D2O. The P (32) CO2line was found to be detuned ∼1.5 GHz from the ν2band transitions6_{6}, 6_{5} rightarrow 5_{5}, 5_{4}. The resulting emission lines at 50.3 ... View full abstract»

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  • Assignments of the high power optically pumped CW laser lines of CH3OH

    Publication Year: 1977, Page(s):485 - 490
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1308 KB)

    Thirteen far IR laser lines in CH3OH, optically pumped by a CO2laser, have been assigned toa- andb-type transitions in ν5CO-stretch band. Identification procedures used were: a frequency match between the CO2pump and CH3OH absorption, frequency match of laser lines and CH3OH ν5transitions, ... View full abstract»

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  • [Back cover]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Interaction of microwave biased n-GaAs and 337 µm radiation

    Publication Year: 1977, Page(s):409 - 412
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1280 KB)

    n-GaAs cooled to 4.2 K is impact ionized with X-band microwave pulses. Fast rise-time modulation of 337 μm radiation is observed. The GaAs is less absorptive in the ionized state than in the unionized state. View full abstract»

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  • Narrow-band CO2-TEA laser for efficient FIR laser pumping

    Publication Year: 1977, Page(s):465 - 468
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1304 KB)

    To reduce the linewidth mismatch between the emission lines of a CO2-TEA laser and the absorption lines of a low-pressure FIR gain medium a tiltable Ge etalon has been introduced into the TEA resonator. The resulting spectral compression and tunability increase the energy conversion efficiency in a TEA laser pumped CH3OH laser by as much as a factor of 37 and has led to the o... View full abstract»

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  • Dependence of longitudinal mode structure on injected carrier diffusion in diode lasers

    Publication Year: 1977, Page(s):403 - 404
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    We hypothesize that the longitudinal mode structure of diode lasers is greatly influenced by the axial diffusion of injected carriers. Thus several longitudinal modes can coexist in lasers which utilize both injected electrons and slowly diffusing injected holes, whereas lasers which only use injected electrons should operate in a single longitudinal mode. View full abstract»

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  • High-power operation and scaling behavior of CW optically pumped FIR waveguide lasers

    Publication Year: 1977, Page(s):491 - 494
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1312 KB)

    High-power far infrared (FIR) laser operation at the 10- 100 mW level is described for wavelengths throughout the 40 μm-1.22 mm spectral region. These data correspond to order of magnitude improvements in converting CO2laser energy into FIR laser output. This improved FIR laser performance is attributed to a waveguide laser geometry with reduced losses for the CO2pump an... View full abstract»

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  • Theory of optically pumped submillimeter lasers

    Publication Year: 1977, Page(s):450 - 454
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1688 KB)

    Theoretical models of the operating characteristics of both pulsed and CW optically pumped submillimeter (SMM) lasers are reviewed. The SMM laser gain is discussed for both pressure and Doppler broadened transitions. A review is given of expressions for SMM laser gain based on quantum mechanical calculations in a three-level molecular system. View full abstract»

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  • Pulse-forming and line-broadening in AM mode locking of the TEA-CO2laser

    Publication Year: 1977, Page(s):381 - 387
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1832 KB)

    The present paper describes AM mode locking for homogeneously broadened systems, a procedure for measuring linewidths under laser conditions, and finally, experimental results for a 1-atm CO2laser. Working in the frequency domain, analytic solutions are given for the pulse bandwidth and pulse shape as a function of frequency detuning. We arrive at a simple expression for the maximum pos... 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
Prof. Hon Ki Tsang
Chinese University of Hong Kong