Near Infrared Pulse Distortion Interference Detection And Research

The research of Inertial Confinement Fusion (ICF) needs to make the laser beam have a good spatial distribution. So the measurement of wavefront aberration plays a great important role in high power laser system.This paper proposed a simple, compact radial shering interferometer.It can reconstructed wave phase distribution and amplitude distribution from one single interferogram.It is appropriate to measure instantaneous wavefront.Establish mathematical model of wave iteration based on the radial shearing wavefront character;Deduce the phase reconstruction and amplitude reconstruction process;Some important issue, such as eliminate wave slope,spectrum borderline selection, spatial phase modulation and so on is analysed.The aberration parameter that associate with laser beam quality is also dicussed.Provide a more scientific method to calculating strehl ratio in high energy laser system.The principle and typical structure of the radial shearing interferometer is described and a rapid optical path adjustment method is proposed.Establish a real radial shearing system that can measure Φ100mm round pupil beam and 100mm×100mm square pupil beam,It approved a precision above λ /15 of RMS error.With Matcom, Visual C++ and OpenGL, a effective software of the system is fulfilled.The software can calculate wave phase and amplitude distribution form interferogram.It also give the PV, RMS, RMS Gradient, CTF, PSF and SR value.This research project provide a set of integrated mathematical model, data calculation software and high precision device for the instantaneous laser beam diagnoses.And it have a wide application foreground in the national defence and war industry.