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IEEE Journal of Quantum Electronics

Issue 11 • November 1968

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Displaying Results 1 - 25 of 53
  • [Front cover and table of contents]

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE
  • Characteristics of organic dye lasers as tunable frequency sources for nanosecond absorption spectroscopy

    Publication Year: 1968, Page(s):707 - 711
    Cited by:  Papers (68)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (745 KB)

    The properties of 1, 1' diethyl-γ-cyano-2,2'-di-carbocyanine-tetrafluoroborate (DTCDCT)and 1, 1'-diethyl-γ-nitro- 4, 4'-di-carbocyanine-tetrafluoroborate (DTNDCT) lasers have been investigated. High-efficiency (25 percent) spectral narrowing of the normal 150-Å-wide, 2-MW output of DTCDCT (around λ 7600 Å) to <0.01 Å, corresponding to a single longitudinal mode, is... View full abstract»

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  • Trivalent-iron-doped andalusite as crystal for microwave waves

    Publication Year: 1968, Page(s):723 - 727
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (461 KB)

    Paramagnetic ions Fe3+, substituted as an impurity in andalusite (Al2SiO5) host crystals, have been experimentally investigated. The spin-lattice relaxation and cross-relaxation times and inversion ratio in this spin system were observed. Dielectric properties of the host crystals were determined. General maser properties of trivalent-iron-doped andalusite crystal ... View full abstract»

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  • High-resolution Stark spectroscopy of molecules by infrared and far-infrared masers

    Publication Year: 1968, Page(s):728 - 732
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB)

    Some of the He-Ne and He-Xe laser lines in the infrared can be tuned within several gigahertz by applying an axial magnetic field. Stark patterns of vibration-rotation lines of organic molecules were observed at 3.36-, 3.39-, 3.50-, and 5.57-μm wavelengths. With applied Stark fields up to 50 kV/cm, many Stark components were resolved and some of the transitions of H2CO, HDCO, and C... View full abstract»

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  • Quantum effects in cyclotron resonance using a CW hydrogen-cyanide laser

    Publication Year: 1968, Page(s):733 - 737
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (579 KB)

    A submillimeter resonance spectrometer has been developed, which employs a molecular gas laser as a source of radiation. Cyclotron resonance measurements of the quantum effects in the valence bands in germanium were taken with the use of a CW HCN laser. It is shown that the use of CW instead of pulsed lasers helps to avoid resonance line broadening and permits extensive quantitative results suitab... View full abstract»

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  • Superconducting quantum electronics

    Publication Year: 1968, Page(s):738 - 744
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    The quantum electronic properties of superconductors have been vividly demonstrated by means of experiments on Josephson tunneling junctions and small area superconducting contacts. Emphasis is placed on ring configurations where quantum state transitions corresponding to changes of magnetic flux of2.07 times 10^{15}webers are directly observed. Such systems can be used to make ultrasen... View full abstract»

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  • Holograms on photochromic films

    Publication Year: 1968, Page(s):757 - 762
    Cited by:  Papers (15)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1025 KB)

    The process of storing a hologram on a photochromic film is considered and equations determining the optimal exposure time for taking holograms under different conditions are obtained. Experiments on storing holograms on photochromic organic films using a He-Ne laser (lambda = 0.63 mu) are described. Possible applications of holograms on photochromic films are discussed. View full abstract»

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  • Q-switching of the CO2laser

    Publication Year: 1968, Page(s):762 - 769
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1010 KB)

    The laser pulses obtainable from aQ-switched CO2laser are calculated and compared with the results of a number of different techniques of performing theQ-switching. The continuously operating laser is considered first. The transition rates between the molecular vibrational states and their occupations are derived from the measured CW power. The laser tube was 1.9 m... View full abstract»

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  • Selection and self-locking of modes in a He-Ne laser with nonlinear absorption

    Publication Year: 1968, Page(s):788 - 790
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Experimental investigations of a long 6328-Å He-Ne laser with a neon absorption discharge cell inside the laser cavity are presented. A considerable difference between the strong field saturation parameters for absorption and gain in the medium leads to a new principal of behavior in the long laser. At small absorption the self-locking of modes and spectrum "weeding out" are observed. The osc... View full abstract»

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  • A high-power CO2laser radar transmitter

    Publication Year: 1968, Page(s):811 - 819
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1565 KB)

    Experiments on the amplification of CW and pulsed infrared signals at 10.6-μ, wavelength have been carried out on CO2laser amplifiers excited by dc and pulsed electrical currents. Measurements of low signal gain, gain saturation, repetitive pulse amplification, and optical distortion have led to the design of a 1-kW average power transmitter with 10-μs infrared output pulses. ... View full abstract»

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  • Time-resolved spectra of high-current pulsed argon lasers

    Publication Year: 1968, Page(s):838 - 842
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (583 KB)

    The time-resolved laser spectrum of a pulsed argon discharge has been examined in the visible region with a fast response photodiode and with an image converter camera in the streak mode. At 10 mtorr pressure of argon, laser action takes place on up to eight lines between 4579 and 5145 Å, seven of these lines being4p rightarrow 4stransitions and one a4p' rightarrow 3dtra... View full abstract»

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  • A circulating-liquid laser system

    Publication Year: 1968, Page(s):842 - 849
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1227 KB)

    A circulating-liquid laser system utilizing Nd in selenium oxychloride is described. An advantage of such a laser is the etticient cooling of the medium. Special components, such as the laser head, circulating pump, and cells compatible with the chemical properties of the medium had to be developed. The system has been operated at I pulse per second with an output of 0.2 joule per pulse with no es... View full abstract»

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  • Output properties of the Nd+3:SeOCl2liquid laser

    Publication Year: 1968, Page(s):849 - 855
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (990 KB)

    Laser action in the liquid medium Nd+3: SeOCl2is described. Details concerning the cell construction and the dependence of output on cell geometry and optical feedback are presented. Output energies of 13 joules with a differential efficiency of 1 percent are reported. An interpretation is offered for the phenomenon of self-Q-switching or the generation of multimeg... View full abstract»

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  • Stabilization of reproducibility of frequencies of He-Ne lasers at 0.63 µ

    Publication Year: 1968, Page(s):868 - 870
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    We have investigated the frequency reproducibility of a He-Ne laser (0.63μ). We used the dependence of absorption on frequency in the strong-field standing-wave limit to provide stabilization. An absorption cell with a pure neon discharge atT = 73degC could be placed both inside and outside the resonator. In the former case, a magnetic field was used to influence the gain profile o... View full abstract»

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  • Study of the lamb dip and of rotational competition in a carbon dioxide laser - Applications to the laser stabilization and to the measurement of absorption coefficients of gases

    Publication Year: 1968, Page(s):874 - 880
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1081 KB)

    A monomode carbon dioxide laser, delivering a constant power on any rotational line of either the 10.4-μ or the 9.4-μ band, has been achieved by control of the cavity frequency and of the gain. A piezoelectric ceramic has been used either for a frequency sweep of the cavity or for output stabilization at the bottom of the Lamb dip. This laser has been used for two studies. View full abstract»

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  • A spatially nonuniform laser model

    Publication Year: 1968, Page(s):888 - 892
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The Statz-deMars rate equations for a four-level laser are replaced by equations that allow for variation of the photon densities and inversion along the laser axis. Analytic solutions of these first order partial differential equations are found for the incubation region of the laser spike, i.e., for the time before stimulated emission can affect the inversion. Analytic solutions of the Statz-deM... View full abstract»

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  • Enhanced and stimulated multiphoton processes in free atoms

    Publication Year: 1968, Page(s):900 - 904
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (511 KB)

    An enhanced two-photon emission has been observed between the 6S and the 4S levels of potassium. The priming field is the stimulated electronic Raman emission at 2720 cm-1due to scattering of ruby laser radiation from the4P_{3/2}state in potassium. The intense emission at the complementary frequency ω2is close to the 5P → 4S resonance lines. As a result,... View full abstract»

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  • Polarization of the fluorescent light of Ne atoms interacting with a laser beam measurement of several relaxation times

    Publication Year: 1968, Page(s):916 - 922
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (733 KB)

    The fluorescent light from two atomic levels is studied assuming that the atoms are subjected to a gas discharge, to a static magnetic field, and, simultaneously, to a laser beam having the transition frequency between the atomic levels. Calculations are developed in the formalism of irreducible tensor operators. One takes into account the existence of isotropic relaxations and cascade effects due... View full abstract»

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  • The influence of CO and CO2laser performance

    Publication Year: 1968, Page(s):948 - 953
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (670 KB)

    Impurities are necessary to achieve considerable CW laser action in CO2since in pure CO2the disintegration of the lower laser level is too slow to maintain a substantial population inversion. The dissociation product CO, provided by the discharge itself if initially pure CO2is used in a sealed system, enhances the gain mainly because of its effectiveness in acceler... View full abstract»

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  • An experimental study of saturable absorbers for ruby lasers

    Publication Year: 1968, Page(s):954 - 968
    Cited by:  Papers (64)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1899 KB)

    This paper presents the results of a study of the behavior of some saturable dye filters used with ruby lasers. We review some apparently contradictory results obtained earlier and present modified forms of energy level models, which are consistent with the known photophysical properties of the molecules. We then present experimental evidence to elucidate the nature of the overall relaxation time,... View full abstract»

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  • A method for the control of gas pressure in the xenon laser

    Publication Year: 1968, Page(s):968 - 969
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (333 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE
  • Photon, spin, and Raman echoes

    Publication Year: 1968, Page(s):802 - 807
    Cited by:  Papers (87)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The general technique of the excitation of a system into a linear superposition of states is reviewed. Recent results in ruby are presented together with a simple theory which predicts Raman echoes. View full abstract»

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  • Influence of the molecular interaction on the ac Kerr effect possibility of a field-induced phase transition

    Publication Year: 1968, Page(s):753 - 756
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The influence of the molecular interaction on the orientation of polarizable molecules in the presence of a strong ac orienting electric field is considered. It is shown that, under certain conditions, a molecular system can be driven into a new ordered phase (similar to a liquid crystal mesophase). This first order transition leads to an orientation quite far from saturation of the molecular alig... View full abstract»

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  • Mode spectra in ring and normal lasers

    Publication Year: 1968, Page(s):940 - 948
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    Observations have been made of the mode power spectra for both ring and normal He-Ne lasers operating at 6328 Å. The interest in such observations is twofold. First a proposed frequency-dependent loss mechanism, which arises through saturation of the medium dispersion, and the use of an aperture to control the losses in the laser cavity are evaluated. Secondly, this loss mechanism, in conjunc... 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