SINGLE SHOT TRANSITION ABSORPTION MEASUREMENT METHOD AND SINGLE SHOT TRANSITION ABSORPTION MEASUREMENT SYSTEM USING BROADBAND SUPER-CONTINUUM ULTRA-SHORT LIGHT PULSE

摘要

PROBLEM TO BE SOLVED: To provide a method and a system for measuring transitional absorption variation of an ultrahigh-speed phenomenon over a wide wavelength band in a substance with a single shot. SOLUTION: A broadband super-continuum ultra-short light pulse 3 is branched into reference light 4 and probe light 5 to input the probe light 5 to an optical fiber 6. A signal light pulse 8 outputted from the optical fiber 6 is entered into a diffraction grating 10. The signal light pulse 8 dispersed by the diffraction grating 10 is subjected to time-space conversion into a frequency distribution 12 by a cylindrical lens 11. The frequency distribution 12 is subjected to spatial frequency filtering by a time-frequency conversion filter 13, and subjected to inverse time-space conversion into a two-dimensional lightwave distribution 15 by a cylindrical lens 14, so that an interference distribution of the lightwave distribution 15 with the lightwave from the reference light 6 is obtained as a light spectrogram 16 representing temporal variation of the frequency distribution of the signal light pulse. COPYRIGHT: (C)2004,JPO