OPTICAL DEVICE

WIPO Patent Application WO/2020/179342

A1

The optical device according to an embodiment of this disclosure comprises a light source, an optical waveguide element, a photodetector, and an optical system. The light source emits a light beam including a plurality of wavelength components. The optical waveguide element comprises a first grating having a refractive index that changes along the radial direction of an imaginary circle centered on a point upon which the light beam is incident and a second grating disposed outside the first grating. The first grating causes a portion of the light beam to propagate as guided light through the optical waveguide element along the radial direction. The second grating emits a portion of the guided light from the optical waveguide element as an emitted light beam. The optical system causes the light beam to fall on the first grating and causes a reflected light beam produced by the reflection of the emitted light beam by an object to fall on the second grating. A portion of the reflected light beam that has fallen on the second grating propagates through the optical waveguide element and is emitted from the first grating as a return light beam. The optical system causes a portion of the return light beam to fall on the photodetector as a plurality of split light beams split according to wavelength.

NISHIWAKI SEIJI

PCT/JP2020/004402

September 10, 2020

February 05, 2020

Click for automatic bibliography generation  

PANASONIC IP MAN CO LTD (JP)

G01B11/00; G02F1/13; G02F1/295

JPH04168427A	1992-06-16
KR20170071394A	2017-06-23
US20020076129A1	2002-06-20
JP2018124271A	2018-08-09
US20010006421A1	2001-07-05

KAMATA Kenji et al. (JP)

View/Download PDF      PDF Help

Previous Patent: HYDROGENATION METHOD AND HYDROGENATION APPARATUS

Next Patent: WATCHING DEVICE, WATCHING METHOD, AND WATCHING PROGRAM