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  • CH3OH  (2)
  • 42.60B  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Mode structure of hollow dielectric waveguide lasers (1990)
    Springer
    Applied physics 51 (1990), S. 272-284 
    Details
    ISSN: 1432-0649
    Keywords: 42.55D ; 42.60B ; 42.60 ; D ; 42.80L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mode structure of hollow dielectric waveguide lasers with free space sections and flat mirrors is studied theoretically and experimentally. The study covers the fundamental mode and the three most important higher order modes, and graphs are given which identify regions of high mode discrimination in the parameter space. Calculated coupling losses are verified experimentally by detailed studies of the output power of CO2 lasers as a function of resonator geometry. The intensity profile inside and outside the resonator is calculated, and the profile outside the resonator is compared with experiments for the fundamental mode as well as for the higher order modes. It is shown that in general the fundamental mode is non-Gaussian, and that drastically different output characteristics are obtained for different choice of output plane. The paper identifies design criteria for obtaining single line and single mode oscillation over a wide tuning range, even in the densest region of the CO2 laser line spectrum, and this is exemplified by a spectroscopic application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325048
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Methanol laser lines from torsionally excited co stretch states, and from OH-bend, CH3-rock, and CH3-deformation states (1986)
    Springer
    International journal of infrared and millimeter waves 7 (1986), S. 1605-1629 
    Details
    ISSN: 1572-9559
    Keywords: optically pumped far infrared laser ; CH3OH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a quasi-CW CO2 oscillator-amplifier combination with peak power 300 Watt, we have generated FIR laser emission in weak absorption bands of CH3OH. 40 new lines are reported, and their wavelengths are measured with a relative accuracy of 5×10−5. A total of 72 lines are assigned. 34 of these involve torsional n=1, 2, and 3 states of the CO stretch and the vibrational ground state. The remaining lines are associated with the CH3-rock, OH-bend, and CH3-deformation modes. The latter are located 1460 cm−1 above the ground state, and are pumped by simultaneous vibrational excitation and torsional deexcitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010761
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  • 3
    Electronic Resource
    Electronic Resource
    Observation and assignment of torsional transitions in FIR emission from optically pumped CH3OH (1983)
    Springer
    International journal of infrared and millimeter waves 4 (1983), S. 707-732 
    Details
    ISSN: 1572-9559
    Keywords: optically pumped far infrared laser ; CH3OH ; internal rotation ; CO stretch vibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using output coupling by reststrahlen reflection from NaCl we have observed 14 new FIR lines in the wavelength range between 30 μm and 60 μm. Two of them have been identified as torsional n=1→0 transitions in the CO stretch vibration. Together with lines previously reported in the literature they are the basis for an identification of 41 FIR lines associated with torsionally excited states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009691
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