device for the production of a series of synchronous lichtpulsen, a einzelpuls short duration are derived and apparatus for measurement of the time evolution of such a einzellichtpulses using this device.

摘要

The device includes several optical paths (11, 12, ... 1n) each consisting of at least one zero-dispersion monomode optical fibre in the shape of a loop closed up on itself by butt-joining its ends by means of at least one connector (20); the number of loops is n if the number N of photons in the initial pulse is greater than 102n; these loops are related in pairs, one following the other, by first directional optical coupling means (212, 223, ... 2(n-1)n) having a relatively modest optical coupling coefficient equal to about (1/N)1/(n+1); second directional optical coupling means (31, 3n) are provided and which also have a relatively modest optical coupling coefficient, relating the first (11) and last (1n) loops with external optical paths (4 or 7; 5 or 8 respectively) for respectively the entry of a modest portion only of the initial light pulse and for the exit of the train of equispaced pulses consisting of, on average, a maximum of a single photon; the periods of revolution of the photons in the loops are equal to relatively prime integer numbers of elementary periods DELTA T; and the periods of revolution of the photons in the loops are sufficiently small for the photons remaining in the loops at the end of a sampling procedure not to constitute background noise problematic in regard to the succeeding sampling procedure. …IMAGE…