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  • 1
    Electronic Resource
    Electronic Resource
    Resonant cavity excitation system for radial array slab CO2 lasers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4319-4322 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A rf excitation system that can drive a gas laser constructed of multiple wide, but narrow-gap (slab), discharge volumes is presented. Resonant cavity techniques adopted from microwave applications are employed to provide uniform rf power division and impedance matching into each electrode channel. This approach when applied to a large radial array of gain channels can be used to create a very high-power laser system in an unusually compact package. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359835
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  • 2
    Electronic Resource
    Electronic Resource
    Operational characteristics of a gas discharge stabilized by a rotating magnetic field (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3616-3620 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The operational characteristics of a gas discharge under the influence of a transverse rotating magnetic field are described. The terminal characteristics and measurements of gas-discharge temperature are presented. Experimental results indicate that a transverse rotating magnetic field can improve gas-discharge stability and useful power deposition into the plasma. A 25% increase in discharge power loading has been demonstrated by using this discharge-stabilization technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339264
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  • 3
    Electronic Resource
    Electronic Resource
    Direct visualization of the focal parameters of a high power CO2 laser beam (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3616-3620 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A diagnostic method for high power CO2 laser beams is presented. The technique features imaging of high intensity infrared radiation via the thermally induced luminosity of high velocity charcoal particles contained within an air stream. The method is particularly convenient for determination of focal position, depth of field, beam diameter, and spot size. Variations of these parameters with power level are easily observed utilizing this charcoal powder imaging method. Using this "real-time'' technique, focal spot size and location accuracy are ±0.1 and ±1 mm, respectively. Results are shown to be independent of micro-particle size within specified limits. As a result, periodic, fine laser-workpiece adjustment is now cost effective when working with high power lasers. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144481
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  • 4
    Electronic Resource
    Electronic Resource
    Variable coupling rotational wand for on-line laser beam sampling (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2482-2487 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: As power levels of industrial lasers increase, effective determination of beam profiles over extended operational regimes becomes problematic, due to dynamic range limitations of available detectors. To address this deficiency, a variable coupling rotating wand was developed for on-line monitoring of output radiation from high average power CO2 lasers. The concept features real-time beam sampling adjustment, activated by wand rotational speed change. An associated controller provides appropriate speed regulation of the wand motor drive, via a computer generated setpoint. Design parameters thereby ensure optimal sensor operation at all power levels. A safety override prevents sensor damage by terminating laser operation, if wand speed decreases below a safe value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143907
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  • 5
    Electronic Resource
    Electronic Resource
    Truncated cone as a pseudoconjugator in a high-power carbon dioxide laser (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2488-2492 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The incorporation of a retroreflecting, pseudoconjugating cone as a folding element in a double-pass unstable resonator of a high-power carbon dioxide oscillator–amplifier is presented. The concept, when implemented with a truncated cone, has yielded significant improvements in optical energy extraction efficiency, beam quality, and alignment stability. The performance of such a modified clear aperture cone resonator, in comparison with a standard roof prism cavity geometry, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143908
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  • 6
    Electronic Resource
    Electronic Resource
    Optimization of photoinitiated impulse-enhanced electrically excited CO2 laser discharges by attachment control (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1445-1450 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Control of frequency and amplitude of the impulses used in photoinitiated, impulse-enhanced, electrically excited laser pumping determines the E/p value of the discharge. This occurs through the influence of these impulses on the processes of electron density decay and ion-electron recombination and dissociative attachment. The degree of attachment can be controlled through the use of high-frequency excitation (f(approximately-greater-than)10 kHz), while the relative importance of ion-electron recombination increases with increasing impulse potentials. The reduced electric field E/p can thus be varied by a factor of 3, while the anode fall potential Va can be reduced from 400 to 250 V. This technique appears amenable to providing fine variation and control of the laser output power. Possible applications in materials processing are pulse shaping and rapid power modulation (superpulsing).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144060
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  • 7
    Electronic Resource
    Electronic Resource
    Electron density measurements in a photoinitiated, impulse-enhanced, electrically excited laser gas discharge (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3088-3092 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the electron density within a photo-initiated, impulse-enhanced, electrically excited (PIE) laser gas discharge are presented. Ion current measurements were made using a single Langmuir electrostatic probe positioned within the laser discharge volume. Calculations of the electron density were made utilizing a thick-sheath analysis. The results indicate that the electron density increases by two orders of magnitude as the pulser power level is increased. In addition, the electron density was observed to decrease markedly as the dc discharge current was increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337765
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of a magnetic field on the growth of instabilities in a helium glow discharge using Monte Carlo simulation of the cathode fall region (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4954-4961 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Monte Carlo simulation technique has been used to model the cathode fall region of a glow discharge under the influence of a nonuniform electric field and a transverse magnetic field. It has been shown experimentally that a magnetic field can serve as an effective means for reducing the growth of discharge instabilities. The stabilization mechanism involves the dispersion of localized charged particle perturbations over the discharge area in a time less than that required for an instability to fully develop. The results of this paper provide a deeper insight into the magnetic stabilization technique, which has the potential of increasing the power output of a wide variety of gas lasers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335321
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic laser discharge stabilization scaling to high-pressure systems (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6761-6765 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The application of the magnetic discharge stabilization technique to high-pressure laser discharges is investigated. Scaling laws are developed with the help of Monte Carlo simulations for the transverse discharge velocity and for the magnetic field strength that is necessary for discharge stability. The results that are obtained indicate that the required magnetic field strength scales as the pressure squared. Unless a cost-effective means is found for implementing a very strong magnetic field into an electrode design, the magnetic discharge stabilization technique will be mainly relegated to low-pressure systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349850
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  • 10
    Electronic Resource
    Electronic Resource
    Multichannel slab discharge for CO2 laser excitation (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 693-695 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental results on a unique multichannel slab-type CO2 discharge system are presented. The interdigital discharge geometry incorporates both large-area and multibeam laser array concepts into a single, compact package. Small signal gain and saturation intensity values indicate that this structure is well suited for use in a CO2 laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105220
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