DEVICE FOR TESTING ABSORPTION RESPONSE OF TERAHERTZ WAVES IN DIFFERENT GAS ENVIRONMENTS

摘要

A device for testing the absorption response of terahertz waves in different gas environments. An ultrashort pulse laser outputted from a laser light source (1) is divided into two beams via a beam-splitting plate (2). A transmission beam passes through a first reflecting mirror (3), a delay module (4), a second reflecting mirror (5), a third reflecting mirror (6) and an ITO film (20), and then enters a terahertz spectrum detection system (21) as a terahertz wave detection light. A reflection beam enters a terahertz wave emission system (7), radiated collimated terahertz waves enter a gas-filled vacuum pipe (10) via a terahertz entry window plate (8), exit via a terahertz exit window plate (9) after interacting with gas molecules, pass through a fourth reflecting mirror (19) and the ITO film (20), and then enter the terahertz spectrum detection system (21). A heating belt (12) and a refrigeration device (13) are arranged on an outer wall of the vacuum pipe (10), controlling the real-time temperature within the vacuum pipe (10). The total length of the vacuum pipe (10) is adjusted by inserting a multi-section vacuum pipe (10). The device measures terahertz absorption response characteristics in gas environments having different temperatures and different pressures.