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The light beam which advances to the phase modulator system, and the phase modulator which have the beam splitter and the linearly polarized light type phase modulator reflecting, separated method of the light beam which advances from the phase modulator conversely
The light beam which advances to the phase modulator system, and the phase modulator which have the beam splitter and the linearly polarized light type phase modulator reflecting, separated method of the light beam which advances from the phase modulator conversely
Purpose of this invention is, while the beam splitter and the light which the polarized light of polarized light state of one specification is done at least, maintaining the above-mentioned polarized light state, although it modulates rectilinear, the reflected type phase modulator which is suited (8) with the phase modulator system which it has (20). The beam splitter and the phase modulator (8), the light beam (1, 3, 5, 7, 9, 10, 11 and 12) paralleling to the optical path, it is arranged. The beam splitter is, is arranged, the polarized light beam splitter (2) the phase modulator system (20), furthermore, the polarized light beam splitter (2) and the phase modulator (8) with paralleling to the optical path between, the light beam (5 and 9) at the sense which can give polarized light state 45 degrees the optical rotor which it turns has (6), here, the phase modulator (8) the light beam which incidence is done (7) polarized light state corresponds to the polarized light state of the above-mentioned specification. This invention, furthermore, is operation possible with reflected type, it regards the method of separating the input light beam from the light beam where phase is modulated the light which the polarized light of linearly polarized light state of one specification is done at least, while maintaining the linearly polarized light state of the above-mentioned specification, although it modulates rectilinear, in the phase modulator system which has the phase modulator which is suited. The said method offers the light beam which possesses 1st polarized light state, a) by making the input light beam the polarized light beam splitter pass, 45 degrees turns b) the above-mentioned 1st polarized light state of the above-mentioned light beam, with the optical rotor at the time of 1st sensing, c) phase reflects the above-mentioned light beam in order to obtain the reflected light beam which is modulated with the phase modulator, here polarized light state of the light beam which incidence is done corresponds to the polarized light state of the above-mentioned specification in the phase modulator, d) the light which possesses a polarized light state where it is perpendicular to the above-mentioned 1st polarized light stateIn order to obtain the beam, 45 degrees it turns polarized light state of the reflected light beam with the optical rotor at the time of the above-mentioned 1st sensing, it separates above-mentioned light beam which possesses the 2nd polarized light e) by making the light beam the above-mentioned polarized light beam splitter pass from the input light beam, step is had.
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