Abstract

We demonstrate experimentally that a self-sustained radio frequency (RF) signal delivered from our most-compact RF circuit generator is efficiently integrated into a CO2 waveguide laser slab, impedance-matched electrode. The whole circuit uses a common source MOSFET transistor that will be modified for self-sustained oscillations terminated at 50Ω. RF power is directly integrated into the laser resonant cavity of the laser ceramic-metal slab (the electrode). Measurement showed the power efficiency of the oscillator circuit to be more than 70%, and the overall electrical-to-optical power efficiency conversion was larger than the standard 10%.

© 2005 Optical Society of America

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References

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  1. A. Lapucci, F. Rossetti, M. Ciofini, and G. Orlando, �??On the longitudinal voltage distribution in radio-frequency-discharged CO2 lasers with large-area electrodes,�?? IEEE J. Quantum Electron. 54, 1537�??1541 (1995).
    [CrossRef]
  2. J. D. Strohschein, W. D. Bilida, H. J. J. Seguin, and C. E. Capjack, �??Computational model of longitudinal discharge uniformity in RF-excited CO2 slab lasers,�?? IEEE J. Quantum Electron. 32, 1289�??1298 (1996).
    [CrossRef]
  3. G. Spindler, �??Two-dimensional computational model of discharge uniformity in radio-frequency-excited CO2 slab lasers with high aspect ratio electrodes,�?? IEEE J. Quantum Electron. 39, 343�??349 (2003).
    [CrossRef]
  4. D. He and D. R. Hall, �??Frequency dependence in RF discharge excited waveguide CO2 lasers,�?? IEEE J. Quantum Electron. 54, 1537�??1541 (1995).

IEEE J. Quantum Electron. (4)

A. Lapucci, F. Rossetti, M. Ciofini, and G. Orlando, �??On the longitudinal voltage distribution in radio-frequency-discharged CO2 lasers with large-area electrodes,�?? IEEE J. Quantum Electron. 54, 1537�??1541 (1995).
[CrossRef]

J. D. Strohschein, W. D. Bilida, H. J. J. Seguin, and C. E. Capjack, �??Computational model of longitudinal discharge uniformity in RF-excited CO2 slab lasers,�?? IEEE J. Quantum Electron. 32, 1289�??1298 (1996).
[CrossRef]

G. Spindler, �??Two-dimensional computational model of discharge uniformity in radio-frequency-excited CO2 slab lasers with high aspect ratio electrodes,�?? IEEE J. Quantum Electron. 39, 343�??349 (2003).
[CrossRef]

D. He and D. R. Hall, �??Frequency dependence in RF discharge excited waveguide CO2 lasers,�?? IEEE J. Quantum Electron. 54, 1537�??1541 (1995).

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Figures (2)

Fig. 1.
Fig. 1.

Open loop RF power oscillator for the MRF151. Asymmetric ‘T’ resonant circuit and a ‘П’ network coupler for input and output are shown.

Fig. 2.
Fig. 2.

Highest output power and best overall operational efficiency obtained at a pressure of 45 Torr.

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