Method and apparatus for measuring the duration of optical radia

Details Method and apparatus for measuring the duration of optical radia Method and apparatus for measuring the duration of optical radia

1982-03-03

1984-09-18

Rosenberger, R. A.

Optics: measuring and testing

Lamp beam direction or pattern

356353, G01J 900, G04F 1302

Patent

active

044720530

ABSTRACT:
An extension of the noncollinear second harmonic generation technique for lse autocorrelation measurements is described. A diffraction-grating is used to produce a tailored, expanded beam, with a differential time delay along its expanded axis. When this beam is combined with an inverted replica of itself at the frequency-doubling crystal, the monitored spatial profile of the generated second harmonic beam gives directly the duration of the incident laser pulse. A time resolution of better than 1 picosecond (ps) is obtained at 500 nanometers (nm), and a total measurement range of .about.80 ps. The optical system here described enables the extension of the measurement range in a simple manner.

REFERENCES:
Optics Communications, vol. 29, No. 2, May 1979 at 239.
Optics Communications, vol. 23, No. 3, Dec. 1977 at 293.
Optics Communications, vol. 30, No. 3, Sep. 1979 at 453.

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