QD Laser Inc.

Kawasaki, Japan

QD Laser Inc.

Kawasaki, Japan
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Murai Y.,Nihon Pharmaceutical University | Suzuki M.,QD Laser Inc. | Sugawara M.,QD Laser Inc. | Tatsumi H.,Tsukuba University of Technology | Miyakawa M.,Tsukuba University of Technology
2016 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2016 - Conference Proceedings | Year: 2016

Laser retina imaging technology enables creation of a clear picture in any retina area. It is focus-free, i.e. irrelevant of refractive disorder. So in many cases of low vision, one can see the picture by one's own eyesight. In this article we describe possible applications of this emerging technology, including 1. Development of eyesight-aid for low vision, an HMD (head-mounted display) on which this technology is implemented, 2. Creating a vision sensitive area map of retina, a novel notion, precisely. Especially this may innovate perimetry technologies in ophthalmology important in finding disorders in vision. We list up requirements for the eyesight-aid, including a compensation of partial visual field loss. Finally we indicate that part of our requirements is feasible by presenting our preliminary experiments. Indeed, we show that it is possible to detect a pictogram ("Exit") and pedestrian boundaries on the road-side both in the view by existing pattern recognition programs (SURF method). © 2016 IEEE.


Yasuoka N.,Fujitsu Limited | Ebe H.,Fujitsu Limited | Kawaguchi K.,Fujitsu Limited | Ekawa M.,Fujitsu Limited | And 5 more authors.
Journal of Lightwave Technology | Year: 2012

A polarization-insensitive quantum dot semiconductor optical amplifiers (QD-SOAs) have been studied for use in future optical communication systems. A part of our work shows that the optical polarization property in QDs depends on both their aspect ratio and strain. To control these two parameters, we propose the use of strain-controlled columnar QDs (SC-CQDs), which exhibit a high aspect ratio and have strain-controlled side barriers for polarization-insensitive operation in the 1.5-μ m wavelength band. QD-SOAs with these optimized SC-CQDs demonstrated polarization-insensitive characteristics. They showed a gain of 8.0 dB with polarization dependence of the gain as low as 0.4 dB, -3-dB saturation output power of 18.5 dBm at a wavelength of 1550 nm, and error-free amplification at a bit rate of 40 Gbit/s. © 2006 IEEE.


Patent
QD Laser Inc. | Date: 2010-03-31

The present invention provides a semiconductor laser including a first conductive type of a lower clad layer 12, an active layer 14 provided on the lower clad layer 12, the active layer 14 including a plurality of quantum dots, and a second conductive type of an upper clad layer 18, the upper clad layer 18 being provided on the active layer 14 so as to have an isolated ridge portion 30 such that W1 Wtop + 0.4 m where Wtop is the width of a top of the ridge portion 30 and W1 is the width of the ridge portion 30 at a height of 50 nm from a bottom of the ridge portion 30. The present invention also provides a method for manufacturing such a semiconductor laser.


Patent
QD Laser Inc. and University of Tokyo | Date: 2016-04-13

The present invention is an image projection device that includes: a light source 12 that emits a laser beam 34; a scanning mirror 14 that two-dimensionally scans the laser beam 34 emitted from the light source 12; and a projection mirror 24 that projects scanned light onto a retina 26 of an eyeball 22 of a user to project an image onto the retina 26, the scanned light being composed of the laser beam 34 that has been scanned by the scanning mirror 14, wherein the laser beam 34 emitted from the light source 12 is scanned by using a part of an operating range of the scanning mirror 14.


Patent
QD Laser Inc. and University of Tokyo | Date: 2014-04-25

The present invention is an image projection device that includes: a light source 12 that emits a laser beam 34; a scanning mirror 14 that two-dimensionally scans the laser beam 34 emitted from the light source 12; and a projection mirror 24 that projects scanned light onto a retina 26 of an eyeball 22 of a user to project an image onto the retina 26, the scanned light being composed of the laser beam 34 that has been scanned by the scanning mirror 14, wherein the laser beam 34 emitted from the light source 12 is scanned by using a part of an operating range of the scanning mirror 14.


Patent
QD Laser Inc. | Date: 2011-03-04

A laser system 100 includes: a laser module 10 including: a DFB laser 12 that oscillates a laser beam 24; a heater 14 that adjusts a temperature of the DFB laser 12; and a harmonic generation element 18 that converts the laser beam 24 into a harmonic beam 34 of the laser beam 24; and a control unit 40 that modulates a wavelength of the laser beam 24, detects a detection signal synchronized with a modulation signal used for the modulation from an intensity of the harmonic beam 34, and controls a value of a heater current 28 to be injected to the heater 14 so as to reduce an amplitude of the detection signal.


Patent
QD Laser Inc. and University of Sheffield | Date: 2015-01-07

A semiconductor light-emitting element includes: a lower clad layer 12 that is provided on a substrate 10; an active layer 20 that is provided on the lower clad layer 12 and includes a quantum well layer 24 and a plurality of quantum dots 28 sandwiching a second barrier layer 22b together with the quantum well layer 24; and an upper clad layer 14 that is provided on the active layer 20, wherein a distance D between the quantum well layer 24 and the plurality of quantum dots 28 is smaller than an average of distances X between centers of the plurality of quantum dots 28.


Patent
QD Laser Inc. | Date: 2013-01-23

A laser system 100 includes: a laser module 10 including: a DFB laser 12 that oscillates a laser beam 24; a heater 14 that adjusts a temperature of the DFB laser 12; and a harmonic generation element 18 that converts the laser beam 24 into a harmonic beam 34 of the laser beam 24; and a control unit 40 that modulates a wavelength of the laser beam 24, detects a detection signal synchronized with a modulation signal used for the modulation from an intensity of the harmonic beam 34, and controls a value of a heater current 28 to be injected to the heater 14 so as to reduce an amplitude of the detection signal.


Patent
QD Laser Inc. and University of Sheffield | Date: 2016-12-07

A semiconductor light-emitting element includes: a lower clad layer 12 that is provided on a substrate 10; an active layer 20 that is provided on the lower clad layer 12 and includes a quantum well layer 24 and a plurality of quantum dots 28 sandwiching a second barrier layer 22b together with the quantum well layer 24; and an upper clad layer 14 that is provided on the active layer 20, wherein a distance D between the quantum well layer 24 and the plurality of quantum dots 28 is smaller than an average of distances X between centers of the plurality of quantum dots 28.


Trademark
QD Laser Inc. | Date: 2015-08-10

Radiotelephony sets; computers; mobile computers; portable computers; cellular phones; smartphones; computer peripheral devices; peripheral device for radiotelephony sets; wearable computers; wearable radiotelephony sets; wearable cellular phones; wearable smartphones; wearable peripheral devices for computers; wearable peripheral devices for radiotelephony sets; wearable peripheral devices for cellular phones; wearable peripheral devices for smartphones; wearable visual display units, namely, units worn on the head for displaying data and video; head-mounted video displays; visual display units for displaying retinal image, namely, units using image protection technology that focuses light onto the retina to create afterimages for a user; wearable visual display units for displaying retinal image, namely, units worn on the head and using image protection technology that focuses light onto the retina to create afterimages for a user; wearable visual display units for displaying retinal image with camera, namely, units worn on the head, using image protection technology that focuses light onto the retina to create afterimages for a user and displaying data and video shot by the camera; 3D spectacles; spectacles. Eye testing machines and apparatus; auxiliary medical devices, for aiding amblyope; devices for examination of the visual field for examining amblyopia; auxiliary medical devices with camera for displaying retinal image for aiding amblyope; devices for examination of the visual field for displaying retinal image for examining amblyopia.

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