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Kinetics of photodarkening in thin films
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Image of FIG. 1.
FIG. 1.

Transmission spectra of films at laser intensity . The red arrow indicates the shift in transmission spectra.

Image of FIG. 2.
FIG. 2.

Variation in transmission as a function of time at wavelengths 580, 600, and 610 nm for the intensity .

Image of FIG. 3.
FIG. 3.

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).

Image of FIG. 4.
FIG. 4.

The variation of saturated absorption coefficient as a function of laser intensity at different wavelengths.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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.


Generic image for table
Table I.

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.

Generic image for table
Table II.

Fitting parameter obtained from Eq. (2) to the calculated decrease in the optical band gap for different laser intensity.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Kinetics of photodarkening in a-As2Se3 thin films