Measurement of static shift -variant point spread function on a picosecond streak camera

摘要

Advances in understanding laser-matter interaction physical processes require extending instrumentation observation limits. In the case of high-speed photography by means of streak analysers, the main contribution in improving instruments comes from high-speed HV electronics and new tube architectures. However, the cost of these technologies is still a limiting factor. The alternative to instrumentation renewal is based on using conventional technology (Centrally symmetric electron lens streak tube) associated to a convenient image processing. This option, relying on prior metrological characterisation of the degradations generated by streak cameras, can be performed thanks to the affordable powerful computing capabilities and the widespread use of CCD readout. This paper describes a simple method for measuring static Point Spread Function (PSF) on streak tube. Experimental results are discussed and then introduced for image restoration purpose. A discussion of a deconvolution method based on Singular Value Decomposition (SVD) for a shift variant blur is briefly sketched. Application of this method shows an actual increase of streak images spatiotemporal resolution.