초록 ▼

A method and apparatus for measuring ultrashort optical pulses is described. Pulse waveforms to be measured are the type which vary at high speed in a time close to or less than the response time of an optical detector. Changes of optical wavelength or frequency are measured at various sections of t

A method and apparatus for measuring ultrashort optical pulses is described. Pulse waveforms to be measured are the type which vary at high speed in a time close to or less than the response time of an optical detector. Changes of optical wavelength or frequency are measured at various sections of that pulse. The light to be measured is split into two beams, and recombined after provided with different delay times, respectively. The combined light is caused to enter a doubling crystal to generate a second-harmonic light, and the second-harmonic light component, or both the second-harmonic and fundamental components, is measured. The intensity shape and chirping of the pulses is obtained from the changes in the intensity of these components as a function of delay time difference by Fourier analysis including iterative arithmetic operations.

대표청구항 ▼

A method for measuring ultrashort optical pulses, which are repetitive pulses at a fixed time interval, comprising the steps of: splitting a light beam to be measured into two beams; directing the two beams through different paths to provide a relative path length difference therebetween; recombinin

A method for measuring ultrashort optical pulses, which are repetitive pulses at a fixed time interval, comprising the steps of: splitting a light beam to be measured into two beams; directing the two beams through different paths to provide a relative path length difference therebetween; recombining said two beams; doubling said recombined beam to produce a second-harmonic beam; processing said doubled beam to obtain spectra distributed at an interval of an interference fringe of a fundamental wave w0; obtaining a spectrum near DC from among said spectra and calculating an intensity shape I(t) therefrom; and obtaining a spectrum near 2w0 from said spectra and calculating a pulse phase therefrom.