OPTICAL DEVICE, AND LASER RADAR DEVICE

• Main Authors: NAKAO JURI, ODA TOSHIHIRO, INOUE DAISUKE, TANEMURA TOMOKI, ICHIKAWA TADASHI, YAMASHITA TATSUYA
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2020
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

To provide a diffraction grating with satisfactory light emission efficiency, which has a simple structure and easy-to-manufacture, and a laser radar device using the diffraction grating.SOLUTION: The optical device includes: a diffraction grating 14 that diffracts light incident from predetermined position 28 and emits the same from the upper surface to the outside world; a diffraction grating 12 that is arranged parallel to the diffraction grating at a predetermined distance, which is formed of a material with a higher refractive index than the material constituting the diffraction grating, and which reflects the light emitted from the lower surface of the diffraction grating opposite to the upper surface and reflects outputs the light emitted from the lower surface of the diffraction grating opposite to the upper surface and output the same to the outside; and a clad 16 formed of a material having the refractive index lower than the constituent material of the diffraction grating 14, which covers a gap between the diffraction grating 14 and the diffraction grating 12 and the surrounding area thereof.SELECTED DRAWING: Figure 1 【課題】簡便な構造で、製造が容易であり、投光効率が良好な回折格子及び当該回折格子を用いたレーザレーダ装置を提供する。【解決手段】所定位置２８から入射した光を屈折させて上面から外界に出射する回折格子１４と、回折格子と所定距離で並行して配設されると共に回折格子を構成する物質よりも高屈折率な物質で構成され、回折格子の上面と逆側の下面から出射された光を反射して外界に出射する回折格子１２と、回折格子１４と回折格子１２との間隙及び周囲を被覆する、回折格子１４の構成物質よりも低屈折率な物質で構成されたクラッド１６と、を備える。【選択図】図１