Analyser for short and ultra-short light pulses

摘要

Measuring appts. for short and ultra-short light pulses consists of an arrangement of beam dividers and reflectors for dividing a beam into two subsidiary pulses and then merging the pulses, an optical element (9) for producing a correlation signal for both pulses and a replaceable detection unit (17). The novelty is that (a) optical components, which differ according to the dispersion of the subsidiary pulses, are arranged in the beam paths of the two subsidiary pulses and/or one or more dispersive components are arranged in one of the beam paths; and (b) the correlation signal producing element (9) is a second order nonlinear optical element, e.g. a lithium beta-borate crystal or a reflective GaAs surface. Also claimed is a method of analysing short and ultra-short laser pulses using the above appts.