Apparatus for measuring the duration of single optical radiation

Details Apparatus for measuring the duration of single optical radiation Apparatus for measuring the duration of single optical radiation

1990-08-13

1991-11-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

324 77R, H01J 3150

Patent

active

050685252

ABSTRACT:
An apparatus for measuring the duration of single short optical radiation lses, particularly laser radiation pulses, by means of autocorrelation and two-photon ionization, contains a Mach-Zehnder interferometer (BS1, BS2, M1, M2) as beam splitter means for generating from a single input radiation pulse (10) two coherent component pulses (14, 16) propagating along two component beam paths (18, 20) each of which contains a section (18a20a) passing through a meausring zone (22) where they overlap, further a two-photon ionization detector having a measuring zone (22) and collector electrode means (36) and counter-electrode means (38) at which an electric output signal is available depending on the number of charge carriers generated in the measuring zone when the component beam pulses overlap, and a measuring system connected to the electrode means (36, 38). The collector electrode means (36) contains a number of strip-type collector electrodes which are to each other and electrically separated from each other and are located in a plane essentially parallel to the two component beam paths ( 18a, 20a) in the measuring zone and are oriented in the longitudinal direction essentially in the direction of the component beam path sections (18a, 22a) passing through the measuring zone (22).

REFERENCES:
patent: 4480192 (1984-10-01), Albrecht et al.
patent: 4681436 (1987-07-01), Ching et al.

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