Three-channel polaro-interferometer for laser-produced plasma diagnostics with femtosecond time resolution

摘要

We describe an upgraded version of a three-channel polaris-interferometer, which enables laser-produced plasma probing with femtosecond time resolution. Test experiments are performed with the use of a 50-fs probe pulse and an air spark produced by a driving nanosecond laser pulse. High-contrast interference plasma images are recorded, making it possible to reconstruct the electron density plasma profile with femtosecond time resolution in a wide range of probing pulse delays relative to the driving pulse.