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Quantum Electronics, IEEE Journal of

Issue 8 • Date August 1971

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

    Page(s): 0
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    Freely Available from IEEE
  • Widening of spectral lines in an Ar+laser

    Page(s): 391 - 396
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    In this paper an investigation of the spectral line widths and shifts of Ar I and Ar II lines in argon ion laser plasma is carried out. The discharge-tube internal diameters were 5 and 7 mm, the current densities were 113, 163, and 242 A/cm2, and the pressures were 0.68, 0.42, and 0.23 torr. Approximate calculations were made of ion and electron temperatures, electron density, ion mean free path, and charge-exchange cross section. It was determined that ion-neutral charge-exchange collisions play an important role in this type of plasma. View full abstract»

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  • New xenon laser line observed

    Page(s): 429
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    A new xenon laser line was observed. Other parametric data are given. View full abstract»

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  • [Back cover]

    Page(s): 0
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    Freely Available from IEEE
  • Two-component-mode filters for optimum single-frequency operation of Nd:YAG lasers

    Page(s): 381 - 387
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    Mode filters such as an intracavity tilted Fabry-Perot etalon, or an internal metallic film used to obtain a single-frequency output in the Nd:YAG laser, only work well for relatively short lasers (∼15 cm) and at reduced values of laser gain or output power level. Two new types of mode selectors for such single-frequency operation that largely overcome these difficulties are investigated here. These consist of a double metallic-film etalon in the laser cavity, or alternatively a combination of an intracavity tilted Fabry-Perot etalon and a single metallic-film reflector etalon. Both methods are considered in some detail and some experimental results are given on the single-frequency operation of a Nd:YAG laser with such mode filters. The relative advantages of the new mode selectors are enumerated and it is shown that the laser output may be taken through the metallic-film reflector etalon without serious loss. View full abstract»

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  • Excitation and relaxation in a high-pressure CO laser

    Page(s): 407 - 412
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    Strong laser emission is reported from a transverse discharge at relatively high pressure in both pure CO and CO-He at room temperature. Calculations of excited population distributions produced by electron CO collisions show an initial distribution that is approximately Boltzmann at a vibrational temperatureT_{upsilon}simeq 6700K. The laser emission spectra exhibit complete inversion. Time delay measurements are in good agreement with known V-V relaxation times in CO, and theptauproduct shows the constancy expected of vibrational relaxation. The evolution of inversion from a near Boltzmann distribution can only be explained by anharmonic oscillator relaxation effects. View full abstract»

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  • Dissociation of carbon dioxide and inversion in CO2laser

    Page(s): 396 - 402
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    The dissociation of carbon dioxide in the CO2laser discharge has been investigated by the infrared absorption method both in flowing and sealed systems. The role of CO2dissociation in creating the population inversion has been clarified. View full abstract»

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  • Thermal effects of a continuously pumped Nd3+:YAG laser

    Page(s): 403 - 407
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    Thermal effects in a Nd:YAG laser rod, which is pumped continuously by tungsten iodine lamps, are described. Measurements using a 0.6328-μman probe beam yielded temperature distribution in and at the boundary of the rod. The results of birefringence and focal length are consistent with theoretical treatments, if an effective heat conversion coefficient peculiar to the apparatus is assumed. The resonance condition of an optical resonator containing a rod exhibiting focusing effect is discussed. View full abstract»

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  • Excited-state absorption of SF6at 936.8 cm-1

    Page(s): 426 - 427
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    An effect that is opposite to saturable absorption in the infrared was observed when a CO2laser beam was passed through SF6. An increase of absorption occurred when the radiant flux of the laser was increased to 10 W/cm2. The effect was observed for the P(28) line of the00deg1-10deg0band of the CO2laser, and was attributed to absorption from excited vibrational states of SF6. View full abstract»

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  • Gas dynamic CO2-He-(N2) laser investigations

    Page(s): 388 - 391
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    Experiments on IR laser action and gain measurements are reported for a CO2-containing gas mixture flow that cools as a result of expansion. The mixture is preheated by a reflected shock wave, and the gas is expanded into a vacuum through a slit. Laser action is obtained in a CO2-He mixture, while the addition of nitrogen increases the gain. The gain was found to depend on the distance from the slit and the gas pressure before the slit. View full abstract»

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  • Nonlinear effects in inorganic liquid lasers

    Page(s): 416 - 424
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    Inorganic liquids, phosphorous, and selenium oxychlorides, used as solvents for Nd, exhibit a number of nonlinear properties, which may reflect in the performance of liquid lasers. Spontaneous and stimulated Raman scattering have been studied. Measured cross sections and gains indicate that up to power levels of a few hundred megawatts per square centimeter the effect on laser and amplifier properties are negligible. No self-focusing has been observed. Under mode-locked conditions substantial conversion to Raman frequencies have been obtained. No connection has been found between stimulated Brillouin scattering and the phenomenon of self-Q-switching. View full abstract»

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  • Helium cleanup in the helium-cadmium laser discharge

    Page(s): 425 - 426
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    We have observed a rapid loss of helium from the discharge volume when operating certain types of sealed-off helium-cadmium laser tubes. In severe cases, a loss over a hundred times larger than that possible by diffusion through the glass walls has been observed. Experiments are described indicating that the lost helium is trapped in cadmium, which condenses on the tube walls in the vicinity of the active discharge. Possible trapping mechanisms are discussed. An improved discharge tube design is presented that effectively eliminates the helium cleanup. View full abstract»

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  • Investigation of tellurium for frequency doubling with CO2lasers

    Page(s): 412 - 416
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    Second-harmonic generation (SHG) of CO2laser radiation with tellurium has been investigated. The nonlinear coefficient was measured (d_{11} =1.6 times 10^{-6}ESU), as were the peak and average power damage thresholds (2-4 MW/cm2and 150 W/cm2). Finally, the SHG conversion efficiency was found to saturate due to increased absorption of the fundamental. View full abstract»

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  • High-efficiency driven Q switching of the CO2laser using the stark effect in molecular gases

    Page(s): 427 - 429
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    High-efficiency drivenQswitching of the CO2laser has been observed by the use of the Stark effect in CH3Cl, CH3F, CH3CHF2, CH2= CF2, and C2H3Cl on various lines in both the 9.4- and 10.4-μ bands. The effect is observed with both pulsed and sinusoidal electric fields applied to the intracavity modulator. 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