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PMT signal as a function of time under stepwise charging voltages. The charging voltage is increased and then decreased in steps of .
Optical emission spectra of PQ50 ferroelectret under positively biased sinusoidal voltages with a frequency of and of . The CCD camera is internally triggered with an exposure time of .
(Color online) Boltzmann plot of the SPS reduced band strengths [i.e., , shown as solid circles] and a least squares fit (straight line) corresponding to a vibrational temperature of . The inset shows the optical attenuation coefficient as a function of wavelength normalized to .
(Color online) Spectral intensities of the SPS (0-0) band at and the FNS (0-0) band at as a function of (open squares and circles). The band strengths were normalized to their respective maximum value at . Also shown are the electric field strengths calculated from the and intensity ratios (upward and downward triangles).
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