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Broadband terahertz time domain spectroscopy (THz-TDS) and time resolved terahertz spectroscopy (TRTS) were performed on a 54 μm thick chalcogenide glass (As30Se30Te40) sample using a two-color laser induced air plasma THz system in transmission and reflection configurations, respectively. Two absorption modes were observed at 2–3 THz and 5–8 THz. The photo-induced conductivity can be well described...