Abstract: A laser sensor module includes a first laser source configured to emit first modulated light, the first modulated light being modulated laser light. The laser sensor module further includes circuitry configured to drive the first laser source with a first modulated driving current to cause the first laser source to emit the modulated laser light, a detector configured to detect the modulated laser light, which induces a photocurrent with variations resulting from modulation of the modulated laser light, and a second laser source configured to emit second modulated light. The circuitry is further configured to drive the second laser source with a second modulated driving current to cause the second laser source to emit the second modulated light. The detector is configured to detect the second modulated light. The circuitry is configured to adapt the amplitude of the second modulated driving current to induce a contribution to the photocurrent.

Abstract: A laser sensor module for detecting a particle density of small particles with a particle size between 0.05 ?m and 10 ?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.

Abstract: A semiconductor component for emitting light includes a main body that comprises at least one mesa body. The mesa body has an emission region for emitting the light. The emission region is assigned a first mirror portion, a second mirror portion, and an active portion arranged between the two mirror portions and serving to produce the light. The semiconductor component further includes electrical contacts for feeding electrical energy into the active portion, with at least one stress element that is attached to a surface of the main body. The stress element is configured to generate in the main body a material stress which has an effect on one or more polarization properties of the emitted light.

Abstract: The invention describes a laser sensor or laser sensor module (100) using self-mixing interference for particle density detection, a related method of particle density detection and a corresponding computer program product. The invention further relates to devices comprising such a laser sensor or laser sensor module. It is a basic idea of the present invention to detect particles by means of self-mixing interference signals and determine a corresponding particle density. In addition at least a first parameter related to at least one velocity component of a velocity vector of the particles is determined in order to correct the particle density if there is the relative movement between a detection volume and the particles. Such a relative movement may for example be related to a velocity of a fluid transporting the particles (e.g. wind speed). Furthermore, it is possible to determine at least one velocity component of the velocity of the particles based on the self-mixing interference signals.

Abstract: The invention relates to a method for the detection of target components that comprise label particles, for example magnetic particles (1). The method includes (a) collecting the target components at a binding surface (12, 112, 512) of a carrier (11, 111, 211, 311, 411, 511); (b) directing an input light beam (L1, L1a, L1b) into the carrier such that it is totally internally reflected in an investigation region (13, 313a, 313b) at the binding surface (12, 112, 512); and (c) determining the amount of light of an output light beam (L2, L2a, L2b) that comprises at least some of the totally internally reflected light. Evanescent light generated during the total internal reflection is affected (absorbed, scattered) by target components and/or label particles (1) at the binding surface (12) and will therefore be missing in the output light beam (L2). This can be used to determine the amount of target components at the binding surface (12) from the amount of light in the output light beam (L2, L2a, L2b).

Abstract: A laser sensor module includes a first laser source configured to emit first modulated light, the first modulated light being modulated laser light. The laser sensor module further includes circuitry configured to drive the first laser source with a first modulated driving current to cause the first laser source to emit the modulated laser light, a detector configured to detect the modulated laser light, which induces a photocurrent with variations resulting from modulation of the modulated laser light, and a second laser source configured to emit second modulated light. The circuitry is further configured to drive the second laser source with a second modulated driving current to cause the second laser source to emit the second modulated light. The detector is configured to detect the second modulated light. The circuitry is configured to adapt the amplitude of the second modulated driving current to induce a contribution to the photocurrent.

Abstract: A laser sensor module includes a laser diode configured emit a laser beam, an electrical driver configured to supply the laser diode with a driving current to stimulate emission of the laser beam, a detector, and an optical arrangement configured to focus the laser beam to a focus region. The laser diode is arranged to emit the laser beam through the optical arrangement to the focus region. The optical arrangement comprises an emission window. The detector is arranged to determine an interference signal. The laser sensor module comprises a soiling detection unit configured to vary a wavelength of the laser beam with a variation amplitude over a predetermined time period to provide a soiling detection signal indicative of a soiling of the emission window based on an interference signal during the wavelength variation of the laser beam.

Abstract: The invention relates to a carrier with a binding surface at which target components that comprise label particles, for example magnetic particles, can collect and optionally bind to specific capture elements. An input light beam (L1) is transmitted into the carrier and totally internally reflected at the binding surface. The amount of light in the output light beam (L2) and optionally also of fluorescence light emitted by target components at the binding surface is then detected by a light detector. Evanescent light generated during the total internal reflection is affected (absorbed, scattered) by target components and/or label particles at the binding surface and will therefore be missing in the output light beam (L2). This can be used to determine the amount of target components at the binding surface from the amount of light in the output light beam (L2, L2a, L2b).

Abstract: A laser sensor for detecting a particle density includes: a laser configured to emit a measurement beam, an optical arrangement being arranged to focus the measurement beam to a measurement volume, the optical arrangement having a numerical aperture with respect to the measurement beam, a detector configured to determine a self-mixing interference signal of a optical wave within a laser cavity of the laser, and an evaluator. The evaluator is configured to: receive detection signals generated by the detector in reaction to the determined self-mixing interference signal, determine an average transition time of particles passing the measurement volume in a predetermined time period based on a duration of the self-mixing interference signals generated by the particles, determine a number of particles based on the self-mixing interference signals in the predetermined time period, and determine the particle density based on the average transition time and the number of particles.

Abstract: The invention describes a laser sensor module (100) for detecting ultra-fine particles (10) 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 (100) comprising: —at least one laser (110) being adapted to emit laser light to at least one focus region in reaction to signals provided by at least one electrical driver (130), —at least one detector (120) being adapted to determine a self-mixing interference signal of an optical wave within a laser cavity of the at least one laser (110), 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, —the laser sensor module (100) being arranged to perform at least one self-mixing interference measurement, —the laser sensor module (100) being adapted to determine a first particle size distribution function with a first sensitivity by means of at

Abstract: The invention describes a laser sensor module. The laser sensor module comprises at least a first laser (111) being adapted to emit a first measurement beam (111?) and at least a second laser (112) being adapted to emit a second measurement beam (112?). The laser sensor module further comprises an optical device (150) being arranged to redirect the first measurement beam (111?) and the second measurement beam (112?) such that the first measurement beam (111?) and the second measurement beam enclose an angle between 45° and 135°. The laser sensor module comprises one detector (120) 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 (111) and at least a second self-mixing interference signal of a second optical wave within a second laser cavity of the second laser (112).

Abstract: A laser sensor module for detecting a particle density of particles, which includes: a laser; a detector; and a mirror. The laser is arranged to emit a laser beam to the mirror. A movement of the mirror is arranged to redirect the laser beam. The laser beam is displaced with respect to a rotation axis of the mirror such that a focus region of the laser beam is moving with a velocity having components normal and parallel to the optical axis of the redirected laser beam such that an angle between the parallel and the normal velocity component is at least a threshold angle of 2°. The detector is arranged to determine a self mixing interference signal of an optical wave within a laser cavity of the laser, the self mixing interference signal being generated by laser light of the laser beam reflected by at least one of the particles.

Abstract: A method of measuring a particle density of particles includes emitting, by a laser, a laser beam directed to a mirror, redirecting the laser beam by the mirror with a predetermined periodic movement, and focusing the laser beam to a detection volume by an optical imaging device. The method further includes determining a self mixing interference signal of an optical wave within a laser cavity if the self mixing interference signal is generated by laser light of the laser beam reflected by at least one of the particles and suppressing a false self mixing interference signal for particle detection if the self mixing interference signal is caused by a disturbance in an optical path of the laser beam. The false self mixing signal caused by the disturbance in the optical path of the laser beam is suppressed in a defined range of angles of the mirror during the periodic movement.

Abstract: The invention describes a laser sensor module (100) for particle density detection. The laser sensor module (100) comprising at least one first laser (110), at least one first detector (120) and at least one electrical driver (130). The first laser (110) is adapted to emit first laser light in reaction to signals provided by the at least one electrical driver (130). The at least one first detector (120) is adapted to detect a first self-mixing interference signal of an optical wave within a first laser cavity of the first laser (110). 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 (100) is adapted to reduce multiple counts of the particle. The invention further describes a related method and computer program product.

Abstract: The invention describes a laser sensor module. The laser sensor module comprises at least a first laser (111) being adapted to emit a first measurement beam (111?) and at least a second laser (112) being adapted to emit a second measurement beam (112?). The laser sensor module further comprises an optical device (150) being arranged to redirect the first measurement beam (111?) and the second measurement beam (112?) such that the 5 first measurement beam (111?) and the second measurement beam enclose an angle between 45° and 135°. The laser sensor module comprises one detector (120) 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 (111) and at least a second self-mixing interference signal of a second optical wave within a second laser cavity of the second laser (112).

Abstract: The invention describes a laser sensor module (100) for detecting ultra-fine particles (10) 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 (100) comprising: —at least one laser (110) being adapted to emit laser light to at least one focus region in reaction to signals provided by at least one electrical driver (130),—at least one detector (120) being adapted to determine a self-mixing interference signal of an optical wave within a laser cavity of the at least one laser (110), 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,—the laser sensor module (100) being arranged to perform at least one self-mixing interference measurement,—the laser sensor module (100) being adapted to determine a first particle size distribution function with a first sensitivity by means of at lea

Abstract: The invention describes a laser sensor module (100) for particle size detection. The laser sensor module (100) comprises at least one first laser (110), at least one first detector (120), at least one electrical driver (130) and at least one evaluator (140). The first laser (110) is adapted to emit first laser light in reaction to signals provided by the at least one driver (130). The at least one first detector (120) is adapted to determine a first self-mixing interference signal (30) of an optical wave within a first laser cavity of the first laser (110). The first self-mixing interference signal (30) 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.

Abstract: The invention describes a laser sensor module comprising at least one Vertical Cavity Surface Emitting Laser (100) and at least one driving circuit (120). The driving circuit (120) is adapted to provide electrical energy to the Vertical Cavity Surface Emitting Laser (100) such that the Vertical Cavity Surface Emitting Laser (100) emits laser pulses (345) with a pulse length (356) of less than 100 ns and a duty cycle of less than 5% in comparison to a continuous laser emission. The driving circuit (120) is further adapted to provide additional energy to the Vertical Cavity Surface Emitting Laser (100) at least 100 ns prior to at least a part of the laser pulses (345) such that the part of the laser pulses (345) 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.

Abstract: A method for determining operating conditions of a particle detector that includes a multimode Vertical Cavity Surface Emitting Laser (VCSEL) includes providing an electrical drive current to the multimode VCSEL such that a laser beam is emitted by the multimode VCSEL and varying the electrical drive current within a predefined range of electrical drive currents. The method further includes determining, as a function of the electrical drive current, an intensity signal of an optical wave within a laser cavity of the multimode VCSEL, determining, as a function of the electrical drive current, a noise measure of the intensity signal, determining a range of electrical drive currents for which the noise measure is below a predefined threshold noise measure value, and determining operating conditions of the particle detector by choosing an electrical drive current for particle detection out of the determined low noise range of electrical drive currents.

Abstract: A method of measuring a particle density of particles includes emitting, by a laser, a laser beam directed to a mirror, redirecting the laser beam by the mirror with a predetermined periodic movement, and focusing the laser beam to a detection volume by an optical imaging device. The method further includes determining a self mixing interference signal of an optical wave within a laser cavity if the self mixing interference signal is generated by laser light of the laser beam reflected by at least one of the particles and suppressing a false self mixing interference signal for particle detection if the self mixing interference signal is caused by a disturbance in an optical path of the laser beam. The false self mixing signal caused by the disturbance in the optical path of the laser beam is suppressed in a defined range of angles of the mirror during the periodic movement.