Laser scattering measurements of electric field, electron density and electron temperature in a plasma-display discharge

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This research has been carried out to develop laser Thomson scattering (LTS) as a diagnostic method of micro-discharges for the plasma display panel (PDF) and to reveal the discharge structure based on profiles of electron density n_e and electron temperature T_e measured by LTS.Obtained results are as follows.1. For the application of LTS to the micro-discharge, difficulties were a very small Thomson scattering signal and the very strong stray laser. In order to overcome these difficulties, we used the photon counting method, and fabricated a special triple-grating spectrometer which had a stray light rejection of 10^8. These allowed us to perform Thomson scattering measurements of n_e and T_e in the micro-discharges.2. The LTS system developed was applied to the micro-discharge which simulated the PDF discharge. As a result, clear LTS signals were detected for the first time at 0.1 mm above the surface of the electrode substrate.3. Profiles of n_e and T_e were measured at 0.1 mm above the surface of the electrode substrate. Values of n_e and T_e were (0.2 - 3) x 10^<19> m^<-3> and (1.6 - 3.4) eV, respectively, depending on the time from the beginning of the pulsed discharge and the observation position.4. The structure of the micro-discharge is discussed in terms of the obtained distributions of n_e and T_e. We have shown that the temporal change of the T_e peak position can be related to the movement of the discharge front which is formed by the wall-charges accumulated on the dielectric surface of the electrode substrate.