FIELD: physics.
SUBSTANCE: device consists of at least two elements which shift the phase by φ0 between at least two areas of a radiation beam at radiation operating frequency of ω0. Said elements have different effective dispersion characteristics. The device provides, for any frequency ω in the radiation frequency operating range [ω0±Δω/2], phase shift Δφ(ω) between said areas of the radiation beam, which satisfies the condition |Δφ(ω)-φ0)|<φ0Δω/2ω0.
EFFECT: reduced deviation of distribution of phase shift between beams at optical frequency.
10 cl, 11 dwg
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