Light-Induced Effects in Amorphous Chalcogenide Glasses: Femtoseconds to Seconds

• DOI: 10.3390/physics3020019
• Publication Date: 2021-04-27T10:19:11Z
• Authors: Pritam Khan; K. V. Adarsh
• Keywords: Photodarkening; Photobleaching; Nanosecond; Metastability

Amorphous chalcogenide glasses are intrinsically metastable, highly photosensitive, and therefore exhibit numerous light-induced effects upon bandgap sub-bandgap illumination. Depending on the pulse duration of excitation laser, ChGs a series spanning over femtosecond to seconds time domain. For continuous wave (CW) illumination, dominantly metastable in terms photodarkening (PD) photobleaching (PB) that take place via homopolar heteropolar bond conversion. On other hand, under nanosecond ultrafast pulsed transient absorption (TA) is instigated from bonding rearrangements through self-trapped exciton recombination. In first part review, we pay special attention PD PB, while second will focus TA controlling such internal external parameters, e.g., chemical composition, temperature, sample history, etc.