公开(公告)号：US11881677B2

公开(公告)日：2024-01-23

申请号：US17198745

申请日：2021-03-11

Applicant: DENSO CORPORATION ,  TOHOKU UNIVERSITY ,  Waseda University

Inventor： Taku Suzuki ,  Masashige Sato ,  Hiroshi Yasaka ,  Nobuhide Yokota ,  Tomohiro Kita

IPC: H01S3/083 ,  H01S3/13 ,  H01S3/081 ,  H01S3/137

CPC classification number: H01S3/1305 ,  H01S3/083 ,  H01S3/0813 ,  H01S3/137 ,  H01S3/1307

Abstract: A laser light source includes: a resonance unit with a light emitter; and an optical negative feedback unit. The resonance unit includes: a first waveguide; a first reflector to input the reflected light to the first waveguide; a second waveguide; a second reflector connected to the second waveguide; and a ring resonator between the first waveguide and the second waveguide. The light from the first reflector is blocked from the ring resonator and partially transmitted to a first end of the first waveguide opposite to a second end connected to the light emitter and the first reflector. The optical negative feedback unit includes: a third waveguide to which the light transmitted to the first end of the first waveguide is inputted; and a third reflector connected to the third waveguide. The light from the third reflector is inputted to the first waveguide via the third waveguide.

公开(公告)号：US11480679B2

公开(公告)日：2022-10-25

申请号：US16690370

申请日：2019-11-21

Applicant: DENSO CORPORATION

Inventor： Tomoki Tanemura ,  Koichi Oyama ,  Taku Suzuki ,  Daisuke Inoue

IPC: G01S17/32 ,  G01S7/00 ,  G01S7/481

Abstract: A distance measurement sensor that detects a distance to an object based on heterodyne detection using light generated from a light source and another light received by a light receiver, includes: a scanning unit which scans the light in a first direction; a diffusing lens which diffuses the light in a second direction; multiplexers which multiplex the light and the another light to provide optical signals, respectively; and a processor which detects the distance to the object based on the optical signals. The light receiver has light receiving antennas in the second direction. The multiplexers are connected to the light receiving antennas, respectively. The processor performs a parallel processing for detecting the distance to the object based on the optical signals with respect to the light receiving antennas individually.

公开(公告)号：US11539185B2

公开(公告)日：2022-12-27

申请号：US17210098

申请日：2021-03-23

Applicant: DENSO CORPORATION ,  TOHOKU UNIVERSITY ,  WASEDA UNIVERSITY

Inventor： Masashige Sato ,  Taku Suzuki ,  Hiroshi Yasaka ,  Nobuhide Yokota ,  Tomohiro Kita

IPC: H01S5/0687 ,  H01S5/042 ,  H01S5/00 ,  H01S5/062

Abstract: A laser apparatus includes: a light source configured to generate laser light; and an optical negative feedback unit configured to narrow a spectral line of the laser light using optical negative feedback. A modulation signal is input to the light source to modulate a frequency of the laser light. A modulation amount in the frequency of the laser light is detected. A modulation sensitivity is calculated from (i) the modulation amount and (ii) an intensity of the modulation signal.