WAVELENGTH SELECTIVE FILTER DEVICE, WAVELENGTH SELECTIVE FILTERING METHOD, AND METHOD OF CALIBRATING FILTER ELEMENT

• Main Authors: YUKINO RYOJI, SANDHU ADARSH, TAKAMURA TSUKASA
• Format: Patent
• Language: English; Japanese
• Published: 27.07.2017
• Subjects: COLORIMETRY; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; RADIATION PYROMETRY; TESTING

PROBLEM TO BE SOLVED: To enable selective extraction of light of a desired wavelength from light containing multiple wavelengths by means of a single optical element at a fixed position.SOLUTION: A wavelength selective filter device comprises an optical element with a surface having a periodically varying refractive index, an optical system for making light containing multiple wavelengths enter the optical element at a fixed incident angle, rotating means for rotating the optical element about an axis perpendicular to the surface thereof, and a controller configured to control a rotation angle of the optical element based on a relationship between the rotation angle of the optical element and a wavelength selected by a diffractive grating. Light of a desired wavelength is extracted from the light entering the optical element by controlling the rotation angle.SELECTED DRAWING: Figure 4 【課題】 単一の光学素子を用い、複数の波長を含む光から所望の波長の光を固定位置で選択的に取り出す。【解決手段】 波長選択フィルタ装置は、表面に周期的な屈折率変化を有する光学素子と、複数の波長を含む光を固定の入射角で前記光学素子に入射させる光学系と、前記光学素子を前記表面と垂直な軸の回りに回転させる回転手段と、前記光学素子の回転角と前記回折格子により選択される波長の対応関係に基づいて、前記回転角を制御する制御部と、を有し、前記回転角の制御により前記光学素子への入射光から所望の波長の光を取り出す。【選択図】図４