Abstract: An eye tracker comprises a shadow mask, a light emitting element, and a detection region at a first side of the shadow mask. The light emitting element emits electromagnetic radiation towards an eye arranged at a second side of the shadow mask, which comprises portions that are transparent for the electromagnetic radiation and portions that are opaque for the electromagnetic radiation, the transparent portions having a maximum width measured in a first horizontal direction. The detection region comprises a pixel array and is configured to receive electromagnetic radiation emitted by the light emitting element, reflected by a cornea of the eye, and transmitted by the shadow mask. A maximum distance PS between adjacent pixels and the maximum width wA of the transparent portions satisfy the following formula: 0.9*wA?PS?1.25*wA, the maximum distance between adjacent pixels being measured in the first horizontal direction.

Abstract: An eye tracker comprises a shadow mask, a light emitting element, and a detection region at a first side of the shadow mask. The light emitting element emits electromagnetic radiation towards an eye arranged at a second side of the shadow mask, which comprises portions that are transparent for the electromagnetic radiation and portions that are opaque for the electromagnetic radiation, the transparent portions having a maximum width measured in a first horizontal direction. The detection region comprises a pixel array and is configured to receive electromagnetic radiation emitted by the light emitting element, reflected by a cornea of the eye, and transmitted by the shadow mask. A maximum distance PS between adjacent pixels and the maximum width wA of the transparent portions satisfy the following formula: 0.9 * w A ? P S ? 125 * w A , the maximum distance between adjacent pixels being measured in the first horizontal direction.

Abstract: A method for operating a display of a virtual reality or augmented reality headset includes determining a direction of movement of a user's eye, estimating a future gaze direction from the determined direction of movement, and rendering an image on the display having higher resolution image data in a region including the estimated gaze direction and lower resolution image data outside of the region including the determined gaze direction. The determining the direction of movement of the user's eye includes illuminating the user's eye with a beam of light emitted by a first laser, receiving, at the first laser, light redirected from the user's eye_such that self-mixing interference occurs within the laser cavity between light generated by the first laser and the light redirected from the user's eye, measuring the self-mixing interference, and determining a direction of movement of the user's eye-from the measured self-mixing interference.

Abstract: An eye tracking device for integrating in a frame for mounting to a user's head includes a laser output unit for fixing to the frame. The laser output unit is configured to provide a laser beam for illuminating a cornea of the user's eye when in use. The eye tracking device also includes a receiver unit for fixing to the frame. The receiver unit is configured to receive a reflection of the laser beam and to provide a tracking signal usable for determining a distance or velocity of the cornea. The eye tracking device further includes a processing unit for determining a rotation of the user's eye from the tracking signal.

Abstract: A self-mixing interferometry sensor module for multilayer target detection includes a light emitter, a detector unit and an array of light detectors. The light emitter is operable to emit coherent electromagnetic radiation out of the sensor module, and undergo self-mixing interference (SMI) caused by reflections of the emitted electromagnetic radiation from layers of different depths of a multilayer target to be placed outside the sensor module. The detector unit is operable to generate an SMI output signal indicative of the SMI of the light emitter. Light detectors of the array are operable to generate auxiliary output signals indicative of a distribution of relative reflections of the emitted electromagnetic radiation from layers of different depths.

Abstract: A self-mixing interferometry sensor module includes at least two light emitters of the same type, a detector unit and an electronic processing unit. Each light emitter is operable to emit coherent electromagnetic radiation out of the sensor module and undergo self-mixing interference (SMI) caused by reflections of the emitted electromagnetic radiation from an external object outside the sensor module. The detector unit is operable to generate output signals indicative of the SMI of the light emitters, respectively. The electronic processing unit is operable to generate a difference signal from the output signals indicative of a movement of the external object.

Abstract: An optical module for spatially offset Raman spectroscopy, the optical module comprising: a laser source mounted on a substrate and configured to emit electromagnetic radiation at a target; a plurality of sensors mounted on the substrate and configured to detect electromagnetic radiation scattered from a plurality of depths in the target; and a first plurality of filters, each disposed over one or more of the plurality of sensors, wherein, the plurality of sensors and filters are arranged on the substrate at spatially offset positions from the laser source; and wherein the first plurality of filters are substantially transparent to a first wavelength band corresponding to a Raman scattering wavelength of a first molecule of the target and substantially opaque to wavelengths outside the first wavelength band.

Abstract: An optical device for proximity sensing includes a tunable laser source for emitting laser light. The tunable laser source includes a vertical cavity surface emitting laser, VCSEL. The VCSEL includes a microelectromechanical system, MEMS, for tuning the VCSEL by changing a length of a laser cavity of the VCSEL and includes a receiver configured to receive laser light emitted by the tunable laser source and reflected from an object.

Abstract: A method for operating a display of a virtual reality or augmented reality headset includes determining a direction of movement of a user's eye, estimating a future gaze direction from the determined direction of movement, and rendering an image on the display having higher resolution image data in a region including the estimated gaze direction and lower resolution image data outside of the region including the determined gaze direction. The determining the direction of movement of the user's eye includes illuminating the user's eye with a beam of light emitted by a first laser, receiving, at the first laser, light redirected from the user's eye_such that self-mixing interference occurs within the laser cavity between light generated by the first laser and the light redirected from the user's eye, measuring the self-mixing interference, and determining a direction of movement of the user's eye-from the measured self-mixing interference.

Abstract: An eye tracking device for integrating in a frame for mounting to a user's head includes a laser output unit for fixing to the frame. The laser output unit is configured to provide a laser beam for illuminating a cornea of the user's eye when in use. The eye tracking device also includes a receiver unit for fixing to the frame. The receiver unit is configured to receive a reflection of the laser beam and to provide a tracking signal usable for determining a distance or velocity of the cornea. The eye tracking device further includes a processing unit for determining a rotation of the user's eye from the tracking signal.

Abstract: A self-mixing interferometry sensor module, comprising a light emitter (LE), a detector unit (DU) and an optical element (OE), wherein the light emitter (LE) is operable to emit coherent electromagnetic radiation towards an external object (ET) to be placed outside the sensor module and undergo self-mixing interference, SMI, caused by reflections of the emitted electromagnetic radiation from the external object back inside the sensor module. The detector unit (DU) is operable to generate output signals indicative of an optical power output of the light emitter (LE) due to the SMI. The optical element (OE) is aligned with respect to the light emitter (LE) such that a first fraction of electromagnetic radiation is directed towards the external target (ET) or the light emitter (LE) and a second fraction of electromagnetic radiation is directed towards the detector unit (DU). An optical power ratio determined by the first and second fractions meets a pre-determined value.

Abstract: A self-mixing interferometry sensor module, comprising a light emitter (LE), a detector unit (DU) and an optical element (OE), wherein the light emitter (LE) is operable to emit coherent electromagnetic radiation towards an external object (ET) to be placed outside the sensor module and undergo self-mixing interference, SMI, caused by reflections of the emitted electromagnetic radiation from the external object back inside the sensor module. The detector unit (DU) is operable to generate output signals indicative of an optical power output of the light emitter (LE) due to the SMI. The optical element (OE) is aligned with respect to the light emitter (LE) such that a first fraction of electromagnetic radiation is directed towards the external target (ET) or the light emitter (LE) and a second fraction of electromagnetic radiation is directed towards the detector unit (DU). An optical power ratio determined by the first and second fractions meets a pre-determined value.

Abstract: The present invention relates to a single photon source, comprising: a microcavity arranged between a concave first minor and a semiconductor heterostructure forming a planar second minor, wherein the microcavity supports an optical mode, a quantum dot embedded in the semiconductor heterostructure and facing the first minor, and a laser light source configured to provide laser light in the microcavity to excite the quantum dot to emit single photons exiting the microcavity.