| 摘要 |
PURPOSE:To eliminate the need for a prism necessary to an expensive polishing, vapor-depositing and sticking by regulating a ratio of a wavelength of an optical beam to a lattice pitch to 1.6-2. CONSTITUTION:When the optical beam 2 is incident on the titled splitter 1, about 90% of the light of the polarized component shown by a signal 3 is diffracted to form the first-order diffracted light 4. While, the light of the polarized component shown by the signal 5 is not diffracted to form a zeroth-order diffracted light 6. The non-diffracted light in the light of the polarized component shown by the signal 3 is contained in the zeroth-order diffracted light 6. The first-order diffracted light 4 is the polarized light in a straight line state and in a vertical polarizing direction against a plane surface, and may be used as a detector. A surface relief lattice of the titled splitter may be produced by recording the lattice on the photoresist with a holographic method, and then by ion-etching it to form a thrown lattice on a glass substrate. When the ratio of the wavelength against the lattice pitch (wavelength/lattice pitch) is >=1.6, especially, >=1.8, an outstanding difference appears in the diffraction efficiency. The obtd. relief lattice may be used as the titled splitter by using the zero-ordered and the first-order diffracted lights.
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