Koninklijke Philips Corporation N.v.

Trumpf Photonic Components Gmbh

Philips Photonics Gmbh

Eos Gmbh Electro Optical Systems

Koninklijke Philips Electronics N.v.

Philips Intellectual Property & Standards Gmbh

Holger Joachim Moench

Stephan Gronenborn

Alexander Marc Van Der Lee

Joachim Wilhelm Hellmig

Mark Carpaij

Ulrich Weichmann

Gero Heusler

Johannes Baier

Carsten Deppe

Petrus Theodorus Jutte

Johannes Hendrikus Maria Spruit

Jens Pollmann-Retsch

Matthew John Lawrenson

Cornelis Reinder Ronda

Marcel F Schemmann

Jochen Philippi

Stefan Paternoster

Thomas Mattes

Philipp Henning Gerlach

Arnd Ritz

Marcel Franz Christian Schemmann

Pavel Pekarski

Xaver Riederer

Jan Jasper Van Den Berg

Gerd Cantzler

Christofher Daniel Charles Hooijer

Tom Munters

Ralf Gordon Conrads

Meng Han

Nicholas Walker

Bernd Ackermann

Koray Karakaya

Carsten Heinks

Adriaan Valster

Adrianus Johannes Stephanes Maria De Vaan

Adrianus Johannes Stephanus Maria De Vaan

Hanns Ernst Fischer

Albert A Comberg

Albrecht Kraus

Klaus Klinkenberg

Eelco G Visser

Marcel F C Schemmann

Ralf Conrads

Jaione Bengoechea Apezteguia

Armand Pruijmboom

Susanne Weidenfeld

Michael Miller

Pascal De Graaf

Alexander Weigl

Stephen McClain

Wouter Jozef Maes

Pieter Hoeven

Bernd Engelbrecht

Johanna Sophie Kolb

Roy Ovink

Ralph Engelbertus Theodorus Gudde

Stefan Schwan

Jan Alfons Julia Stoffels

Ad Van Den Brandt

Peter Dannberg

Andreas Peter Engelhardt

Serge Monteix

Mark Schuermann

Johannes Henrikus Maria Spruit

Martin Grabherr

Johan Wijntjens

Edmond Mariette E Verstraeten

Robert Van Der Kloet

Nicolaas Hubertina Gerardus Reijnders

Christofher D C Hooijer

Jaione Bengoechea

A vertical cavity surface emitting laser device includes: an optical resonator; a photodiode; and a contact arrangement. The optical resonator includes: two distributed Bragg reflectors (DBRs) and an active region between the DBRs. The photodiode has a light absorption region in the optical resonator. The contact arrangement provides drive current to pump the optical resonator, and contacts the photodiode. The active region has an InGaAs layer, where 0≤x<1. The light absorption region has an InGaAs layer, where 0<y<1, and y>x. The InGaAs layer is an intrinsic layer of the light absorption region. The InGaAs layer is 15-50 nm thick. The light absorption region has an undoped layer with a material different from the InGaAs layer. The InGaAs layer is immediately adjacent to the undoped layer. An intrinsic zone of the light absorption region is at least 70 nm thick.

Vertical cavity surface emitting laser device with monolithically integrated photodiode

A time-of-flight depth camera includes a VCSEL array, an optical arrangement, an evaluator and a light detector having at least one detector pixel. The VCSEL array or the optical arrangement are arranged to provide different illumination patterns in a reference plane in a defined field-of-view of the time-of-flight depth camera. The light detector is arranged to detect the different illumination patterns and the evaluator is arranged to reconstruct a depth image of the field of view with a resolution of a predefined number of pixels P based on the detected different illumination patterns. A number of the detected different illumination patterns N is at least 5% of the predefined number of pixels P, preferably at least 10% of the predefined number of pixels P and most preferred at least 20% of the predefined number of pixels P.

Time-of-flight depth camera with low resolution pixel imaging

A laser sensor module for detecting a particle density of small particles with a particle size between 0.05 &#x3bc;m and 10 &#x3bc;m includes a first laser configured to emit a first measurement beam, a second laser configured to emit a second measurement beam, and an optical arrangement configured to focus the first measurement beam to a first measurement volume and to focus the second measurement beam to a second measurement volume. The optical arrangement includes a first numerical aperture and a second numerical aperture arranged to detect a predetermined minimum particle size. The laser sensor module further includes a first detector configured to determine a first self-mixing interference signal of a first optical wave, a second detector configured to determine a second self-mixing interference signal of a second optical wave, and an evaluator.

Optical particle sensor module

A VCSEL device includes a first electrical contact, a substrate, a second electrical contact, and an optical resonator arranged on a first side of the substrate. The optical resonator includes a first reflecting structure comprising a first distributed Bragg reflector, a second reflecting structure comprising a second distributed Bragg reflector, an active layer arranged between the first and second reflecting structures, and a guiding structure. The guiding structure is configured to define a first relative intensity maximum of an intensity distribution within the active layer at a first lateral position such that a first light emitting area is provided, to define at least a second relative intensity maximum of the intensity distribution within the active layer at a second lateral position such that a second light emitting area is provided, and to reduce an intensity in between the at least two light-emitting areas during operation.

Segmented vertical cavity surface emitting laser

The invention describes a laser printing system () for illuminating an object moving relative to a laser module of the laser printing system () in a working plane (), the laser module comprising at least two laser arrays of semiconductor lasers and at least one optical element, wherein the optical element is adapted to image laser light emitted by the laser arrays, such that laser light of semiconductor lasers of one laser array is imaged to one pixel in the working plane of the laser printing system, and wherein the laser printing system is a 3D printing system for additive manufacturing and wherein two, three, four or a multitude of laser modules () are provided, which are arranged in columns (c, c) perpendicular to a direction of movement () of the object in the working plane (), and wherein the columns are staggered with respect to each other such that a first laser module () of a first column of laser modules (c) is adapted to illuminate a first area (y) of the object and a second laser module () of a second column (c) of laser modules is adapted to illuminate a second area (y) of the object, wherein the first area (y) is adjacent to the second area (y) such that continuous illumination of the object is enabled.

Laser printing system

A laser arrangement includes a laser array including a multitude of lasers and an optical device configured to provide a defined illumination pattern in a defined field-of-view. The optical device includes a multitude of localized optical structures, each respective localized optical structure being associated with at least one respective laser of the laser array and being arranged to redirect laser light emitted by the at least one respective laser such that laser light emitted by the at least one respective laser appears to be emitted from at least one apparent position of the laser array. The localized optical structures are arranged such that laser light emitted by at least one respective selected laser appears to be emitted from at least two apparent positions of the laser array. The optical device is arranged such that the apparent positions are distributed in an irregular pattern.

Laser arrangement with irregular emission pattern

The invention describes a laser sensor module () for detecting ultra-fine particles () with a particle size of 300 nm or less, more preferably 200 nm or less, most preferably 100 nm or less, the laser sensor module () comprising: &#x2014;at least one laser () being adapted to emit laser light to at least one focus region in reaction to signals provided by at least one electrical driver (), &#x2014;at least one detector () being adapted to determine a self-mixing interference signal of an optical wave within a laser cavity of the at least one laser (), wherein the self-mixing interference signal is caused by reflected laser light reentering the laser cavity, the reflected laser light being reflected by a particle receiving at least a part of the laser light, &#x2014;the laser sensor module () being arranged to perform at least one self-mixing interference measurement, &#x2014;the laser sensor module () being adapted to determine a first particle size distribution function with a first sensitivity by means of at least one measurement result determined based on the at least one self-mixing interference measurement, the laser sensor module being further adapted to determine a second particle size distribution function with the second sensitivity, the second sensitivity being different from the first sensitivity, &#x2014;the at least one evaluator () being adapted to determine a particle measure of the particle size of 300 nm or less by subtracting the second particle size distribution function multiplied with a calibration factor q from the first particle size distribution function. The invention further describes a corresponding method and computer program product. The invention enables a simple and low-cost particle detection module or particle detector based on laser self-mixing interference which can detect particles with a size of 100 nm or even less.

Laser sensor for ultra-fine particle size detection

A time-of-flight camera module includes a controller, a time-of-flight detector, a laser device, and an optical unit comprising a polarization rotator arranged to rotate a plane of polarized light. The controller is configured to modulate the time-of-flight detector and the laser device in a depth sensing mode. The time-of-flight detector is configured to record depth data of a scene in the depth sensing mode by means of modulated laser light emitted by the laser device and reflected from an object in the scene. The depth data is descriptive of a distance to the object in the scene. The controller is further configured to modulate the time-of-flight detector and the polarization rotator in a surface polarization sensing mode. The time-of-flight detector is configured to record polarization data of the scene in the surface polarization sensing mode by detection light received from the object in the scene after traversing the polarization rotator.

Polarization detection improved sensing

A display apparatus configured to be coupled to a movable object includes at least a first laser sensor module and a display device configured to display a field-of-view. The first laser sensor module is configured to determine, by self mixing interference measurements, movements of the movable object with respect to a reference object mechanically coupled to the movable object. The first laser sensor module is configured to emit at least three measurement beams in three different spatial directions to the reference object when the display apparatus is coupled to the movable object and the first laser sensor module is configured to determine velocity vectors or distances collinear to the spatial directions. The display device is configured to integrate at least one virtual object in the field-of-view in accordance with the determined movements of the movable object.

Display apparatus for computer-mediated reality

The invention describes a laser sensor module. The laser sensor module comprises at least a first laser () being adapted to emit a first measurement beam (') and at least a second laser () being adapted to emit a second measurement beam (&#x2032;). The laser sensor module further comprises an optical device () being arranged to redirect the first measurement beam (&#x2032;) and the second measurement beam (&#x2032;) such that the first measurement beam (&#x2032;) and the second measurement beam enclose an angle between 45&#xb0; and 135&#xb0;. The laser sensor module comprises one detector () being adapted to determine at least a first self-mixing interference signal of a first optical wave within a first laser cavity of the first laser () and at least a second self-mixing interference signal of a second optical wave within a second laser cavity of the second laser (). This configuration enables determination of an average velocity of the particles despite of the fact that it is not possible to determine the components of the velocity vector. The introduced error by means of statistical variations is acceptable because the number of detected particles scales with the cubic root of the particle velocity. The invention further describes a particle sensor () comprising such a laser sensor module, a corresponding method and computer program product. The invention enables a simple and low-cost particle sensor () for detecting small particles based on laser self-mixing interference.

Optical particle sensor

A laser arrangement includes a VCSEL array comprising multiple VCSELs arranged on a common semiconductor substrate, an optical structure, and a diffusor structure. The optical structure is arranged to reduce a divergence angle of laser light emitted by each respective VCSEL to a section of the diffusor structure assigned to the respective VCSEL. The diffusor structure is arranged to transform the laser light received from the optical structure to transformed laser light such that a continuous illumination pattern is configured to be provided in a reference plane in a defined field-of-view. The diffusor structure is arranged to increase a size of the illumination pattern in comparison to an untransformed illumination pattern which can be provided without the diffusor structure. The VCSEL array, optical structure, and diffusor structure are arranged such that sections of the diffusor structure do not overlap. Diffusor properties of the diffusor structure vary across the diffusor structure.

Laser arrangement comprising a VCSEL array

The invention describes a laser sensor module () for particle density detection. The laser sensor module () comprising at least one first laser (), at least one first detector () and at least one electrical driver (). The first laser () is adapted to emit first laser light in reaction to signals provided by the at least one electrical driver (). The at least one first detector () is adapted to detect a first self-mixing interference signal of an optical wave within a first laser cavity of the first laser (). The first self-mixing interference signal is caused by first reflected laser light reentering the first laser cavity, the first reflected laser light being reflected by a particle receiving at least a part of the first laser light. The laser sensor module () is adapted to reduce multiple counts of the particle. The invention further describes a related method and computer program product.

Laser sensor for particle density detection

The invention relates to a heating system for heating a living being, for instance, a person () within a vehicle () being preferentially a hybrid car or an electric car. The heating system comprises an infrared laser system () for illuminating the living being with infrared laser light, thereby heating the living being. Thus, heating radiation is used, which has a high collimation and which can be focused relatively easily. The heating can therefore be confined to a certain region, in which the living being is located. The heating can even be confined to the living being or to parts of the living being only. This more focused heating allows for a reduction of the energy consumption.

Heating system for heating a living being

The invention describes a laser sensor module comprising at least one Vertical Cavity Surface Emitting Laser () and at least one driving circuit (). The driving circuit () is adapted to provide electrical energy to the Vertical Cavity Surface Emitting Laser () such that the Vertical Cavity Surface Emitting Laser () emits laser pulses () with a pulse length () of less than 100 ns and a duty cycle of less than 5% in comparison to a continuous laser emission. The driving circuit () is further adapted to provide additional energy to the Vertical Cavity Surface Emitting Laser () at least 100 ns prior to at least a part of the laser pulses () such that the part of the laser pulses () are emitted under defined optical conditions. The invention further describes a distance detection device comprising the laser sensor module and a method of driving the laser sensor module. The additional energy is preferably provided by means of a current pre-pulse () which is applied to the V(E)CSEL prior to preferably each laser pulse (). The current pre-pulse is preferably arranged such that no laser light is emitted by means of the V(E)CSEL. The V(E)CSEL are enabled to emit the laser pulses () under defined optical conditions such that the time of emission and the pulse shape of the laser pulses () is well defined. Well defined time of emission and the pulse shape of the laser pulses () enable a reliable detection of reflected laser light () which corresponds to the emission of the respective laser pulse ().

Laser sensor module

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Vaals, Netherlands

Holger Joachim Moench