15. In a STED microscope, a circular depletion laser beam is passed through a "spiral" phase plate with centers of the beam and the plate being precisely aligned. This introduces a phase shift into the light wave, which changes linearly from 0 to 2n along the beam circumference as shown on the diagram. As a result, if wave electrical field strength before the plate was Eo=A*sin(po) where po =const, immediately after the plate the wave electrical field strength became E=A*sin(po+p) where o changes linearly from 0 to 2r along the beam circumference Using Huygens-Fresnel principle prove that after passing the phase plate the wave electrical field strength Ex equals 0 in every point X on the central axis (the center is dark). spiral phase plate 「のo be SOLUTION:
15. In a STED microscope, a circular depletion laser beam is passed through a "spiral" phase plate with centers of the beam and the plate being precisely aligned. This introduces a phase shift into the light wave, which changes linearly from 0 to 2n along the beam circumference as shown on the diagram. As a result, if wave electrical field strength before the plate was Eo=A*sin(po) where po =const, immediately after the plate the wave electrical field strength became E=A*sin(po+p) where o changes linearly from 0 to 2r along the beam circumference Using Huygens-Fresnel principle prove that after passing the phase plate the wave electrical field strength Ex equals 0 in every point X on the central axis (the center is dark). spiral phase plate 「のo be SOLUTION:
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Transcribed Image Text:15. In a STED microscope, a circular depletion laser beam is passed through a "spiral" phase
plate with centers of the beam and the plate being precisely aligned. This introduces a
phase shift into the light wave, which changes linearly from 0 to 2n along the beam
circumference as shown on the diagram.
As a result, if wave electrical field strength before the plate was Eo=A*sin(o) where po
=const, immediately after the plate the wave electrical field strength became
E=A*sin(po+p) where p changes linearly from 0 to 2n along the beam circumference
Using Huygens-Fresnel principle prove that after passing the phase plate the wave
electrical field strength Ex equals 0 in every point X on the central axis (the center is
dark).
spiral phase plate
*の0
be
SOLUTION:
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