Transmission spectra of films at laser intensity . The red arrow indicates the shift in transmission spectra.
Variation in transmission as a function of time at wavelengths 580, 600, and 610 nm for the intensity .
Variation in absorption coefficient with time at indicated wavelengths for the intensity . The laser ON and OFF states are also shown in figure. Inset shows the decay and rise of the transient part of the changes in linear time scale with laser is switched off and on, respectively. The red solid line represents fitting of Eq. (1).
The variation of saturated absorption coefficient as a function of laser intensity at different wavelengths.
Relation between time constant with different pump intensity (a) 580 nm, (b) 600 nm, and (c) 610 nm wavelengths. The red line is the linear fit.
Time variation in the changes in optical band gap for different laser intensity. The solid black circle shows the optical band gap before the exciting laser is switched on.
Fitting parameter , , and obtained from Eq. (1) to the calculated rise of the absorption coefficient at 580, 600, and 610 nm wavelengths for the different laser intensity.
Fitting parameter obtained from Eq. (2) to the calculated decrease in the optical band gap for different laser intensity.
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