Sensitive, time-resolved, broadband spectroscopy of single transient processes

摘要

Intracavity absorption spectroscopy with a broadband Er3+-doped fiber laser is applied to time-resolved measurements of transient gain and absorption in electrically excited Xe and Kr plasmas. The achieved time resolution for broadband spectral recording of a single process is 25 A mu s. For pulsed-periodic processes, the time resolution is limited by the laser pulse duration, which is set here to 3 A mu s. This pulse duration also predefines the effective absorption path length, which amounts to 900 m. The presented technique can be applied to multicomponent analysis of single transient processes such as shock tube experiments, pulse detonation engines, or explosives.