Abstract: A measurement system is disclosed for light-based measurement of collagen, using a first light intensity and a second light intensity. The measurement system comprises a light source for emitting a light beam having a source wavelength range and an optical system to polarize light within the source wavelength range, thereby generating a polarized light beam, and to direct and focus the polarized light beam to a target position inside the skin at a predetermined focus depth below an outer surface of the skin. The measurement system further comprises a first detector, and a second detector for detecting the first light intensity and the second light intensity within, respectively, a first detection wavelength range and a second detection wavelength range of light reflected from the target position.

Abstract: The invention provides a system (1) comprising a sensor (100) for measuring a skin parameter, the sensor (100) comprising (i) a plurality of spatially separated light sources (110) configured to provide light source light (111), and (ii) a detector (120) configured at a first distance (d1) from each of the light sources (110), wherein the sensor (100) is configured to provide the light source light (111) with optical axes (OL) under an angle of incidence (?) selected from the range of 10-80° with the skin at a second distance (d2) and to detect reflected light source light (111), wherein the sensor (100) comprises at least three light sources (110), wherein the light sources (110) are configured to provide unpolarized visible light source light (111), wherein the first distance (d1) is selected from the range of 10-80 mm, wherein the detector (120) is configured to detect polarized light, wherein the sensor (100) comprises a polarizer (104) configured upstream of the detector (120), and wherein the polarizer

Abstract: There is provided a cutting element for use in a hair cutting device. The cutting element includes an optical waveguide having an optical axis and a sidewall, wherein a portion of the sidewall forms a cutting face for contacting hair; wherein the optical waveguide includes a plurality of structures formed along the optical axis, the structures having a refractive index which is different to a refractive index of the optical waveguide. A hair cutting device comprising a cutting element, and a method of manufacturing an optical waveguide cutting element are also disclosed.

Abstract: There is provided a hair cutting device a hair cutting device for cutting hair on a subject, the hair cutting device comprising a light source for generating light at one or more specific wavelengths corresponding to wavelengths absorbed by one or more chromophores in or on hair; a cutting element that comprises an optical waveguide that is coupled at a first end to the light source to receive light, wherein a portion of a sidewall of the optical 5 waveguide forms a cutting face for contacting hair; and a control unit that is coupled to the light source, wherein the control unit is configured to vary the power of the light generated by the light source between first and second power levels during operation such that, on heating of a hair by light coupling from a contact point on the cutting face into the hair, the temperature of the contact point on the cutting face is maintained below a glass transition 10 temperature for the optical waveguide, wherein the first power level is higher than the second power le

Abstract: There is provided a cutting assembly for use in a hair cutting device. The cutting assembly includes a cutting element having a first end and a second end, the cutting element comprising an optical waveguide for receiving light from at least one light source. The cutting assembly includes a first light guiding element configured to guide light from the at least one light source into the first end of the cutting element, and a second light guiding element configured to guide light from the at least one light source into the second end of the cutting element. Each of the light guiding elements comprises a taper transition section in which a diameter of the light guiding element reduces from a first diameter to a second diameter. A hair cutting device comprising a cutting assembly is also disclosed.

Abstract: The invention provides a non-invasive device comprising an optical system having a laser light source for generating a light beam, being configured such that, in use, the light beam exits the device and impinges on an outer surface of the skin to be treated; the optical system being configured to focus, in use, the light beam at a position of a treatment location inside the skin, whereby Laser Induced Optical Breakdown is induced at the position of the treatment location; an opening disposed such that, in use, light returning from the skin enters the device as a measurement light beam; and a first and second intensity detection channel configured and arranged to detect the intensity in, respectively, a first and a second bandwidth range of the measurement light beam, wherein the first and the second bandwidth ranges both comprise a wavelength of light produced in the skin as a result of Laser Induced Optical Breakdown, and the first bandwidth range comprises the Second Harmonic Generation wavelength of the la

Abstract: The present invention discloses a device and a method for controlling growth of hair on human skin with low doses of electromagnetic radiation, and a device for carrying out the method. In the method, radiation of a suitable spectrum is applied to the skin, in one or more pulses of between 1 and 100 ms, and with maximum fluencies on the skin between 1 and 12 J/cm2. By applying such low fluencies and at controlled pulse durations, follicles of the hairs are induced to the catagen phase. This means that the growth of the hairs of those follicles will stop. Although the method is not primarily aimed at immediate hair removal, hairs may be shed subsequently. In any case, further growth may be stopped for prolonged periods of time. The main advantage of the method is that the risk of damage to the skin is minimized.

Abstract: A device (10) for light based skin treatment is provided. The device (10) comprises a light source (18) for providing an incident light beam (21) for treating a skin (30), optical elements for focusing the incident light beam (21) in a focal point (22) inside the skin (30), and a skin interface element (11) for, during use of the device (10), providing optical coupling of the incident light beam (21) from the device (10) into the skin (30). The skin interface element (11) comprises a transparent exit window (12) for allowing the incident light beam (21) to leave the device (10), on top of the exit window (12), a transparent mixture (13) of a polar substance and an apolar substance, and on top of the transparent mixture (13), a transparent foil (14), the transparent foil (14) being more hydrophobic than the exit window (12).

Abstract: A hair cutting device for cutting hair on a body of a subject is presented. The hair cutting device comprises a laser light source, a light guiding element for guiding light from the light source to the cutting element. The cutting element comprises an optical waveguide for receiving light from the light guiding element. The light guiding element has a tapered section in which a diameter of the light guiding element reduces from a light source side diameter to a cutting element side diameter. A portion of a sidewall of the optical waveguide of the cutting element forms a cutting face for contacting hair.

Abstract: A pulsed laser skin treatment device is for laser induced optical breakdown of hair or skin tissue. A feedback system is used for detecting a feedback system based on light and/or sound/and/or contact force or pressure. The feedback signal is used to determine whether a pulse was in the tissue or outside the tissue. With these data an effectiveness of the treatment can be determined which can be provided to a user.

Abstract: A cutting head for a device for cutting hair is disclosed. The cutting head has an optical system configured to direct a laser beam along an optical axis across a cutting zone within the cutting head. The optical system has a variable focus lens configured to control the position of the focal point of the laser beam along the optical axis within the cutting zone.

Abstract: A device (10) for light based skin treatment is provided. The device (10) comprises a light source (18) for providing an incident light beam (21) for treating a skin (30), optical elements for focusing the incident light beam (21) in a focal point (22) inside the skin (30), and a skin interface element (11) for, during use of the device (10), providing optical coupling of the incident light beam (21) from the device (10) into the skin (30). The skin interface element (11) comprises a transparent exit window (12) for allowing the incident light beam (21) to leave the device (10), on top of the exit window (12), a transparent mixture (13) of a polar substance and an apolar substance, and on top of the transparent mixture (13), a transparent foil (14), the transparent foil (14) being more hydrophobic than the exit window (12).

Abstract: There is provided a hair cutting device for cutting hair on a body of a subject, the hair cutting device comprising a light source for generating light at one or more specific wavelengths corresponding to wavelengths absorbed by one or more chromophores in or on hair; a cutting element that comprises an optical waveguide that is coupled at a first end to the light source to receive light, wherein a portion of a sidewall of the optical waveguide forms a cutting face for contacting hair; and a control unit that is coupled to the light source, wherein the control unit is configured to receive an input relating to a region of the body on which hair is to be cut and/or a speed of movement of the hair cutting device, and to control the power of the light generated by the light source based on the received input.

Abstract: The invention provides a non-invasive skin treatment device (100) comprising: a light source (10) constructed and configured for generating linearly polarized probe light (12) and linearly polarized treatment light (22), a polarization modulator (30) constructed and configured for controlling a polarization direction of the probe light and a polarization direction of the treatment light, a polarization sensitive sensor (40) constructed and configured for sensing a level of depolarization of the probe light by sensing an intensity of back-scattered probe light (42) from the target position (210) in a predefined polarization direction of the polarization sensitive sensor, and a controller (60) being configured for scanning the polarization direction of the probe light over a predefined range while receiving the measurement signal (Sm) and for selecting an optimum polarization (P1) direction for which the depolarization of the probe light is at a minimum.

Abstract: There is provided a hair cutting device for cutting hair on a body of a subject, the hair cutting device comprising a source for generating light at one or more specific wavelengths corresponding to wavelengths absorbed by one or more chromophores in or on hair; a cutting element that comprises an optical waveguide that is coupled at a first end to the source to receive light, wherein a portion of a sidewall of the optical waveguide forms a cutting face for contacting hair; a sensor for measuring a force acting on the cutting element; and a control unit that is coupled to the source and the sensor, wherein the control unit is configured to control the power of the light generated by the source based on the measured force, and wherein the power of the light is controlled to a first non-zero level if the measured force is below a first threshold, and controlled to a second non-zero level if the measured force is above a second threshold, wherein the first non-zero level is less than the second non-zero level an

Abstract: There is provided a guard structure for use in a hair cutting device for cutting hair on a body of a subject, the guard structure comprising one or more guard elements, wherein the one or more guard elements are arranged such that in use in the hair cutting device the one or more guard elements space an optical waveguide in the hair cutting device from the skin of the subject, and wherein the one or more guard elements are shaped and/or formed to minimise or reduce the coupling of light from the optical waveguide to the guard structure.

Abstract: There is provided a cutting element for use in a hair cutting device. The cutting element comprises an optical waveguide having a sidewall, wherein a portion of the sidewall forms a cutting face for contacting hair. The cutting element also comprises a hair support structure configured to restrict lateral movement of a hair in contact with the cutting face, relative to the optical waveguide. The hair support structure comprises a plurality of movement restrictors extending from the cutting face. Each movement restrictor comprises a ridge protruding from the cutting face of the optical waveguide, these ridges are arranged parallel to one another. A hair support structure for use with a cutting element, and a hair cutting device including such a cutting element are also disclosed.

Abstract: The measurement system 110 comprises a light source 120 configured and arranged for emitting a light beam via a polarization modulator 130 to a target position inside the skin 160, wherein the polarization modulator 130 is configured and arranged to simultaneously provide, in use, a first and a second region in a cross-section of the light beam in the target position, the first and the second region being distinct and having a corresponding first and second direction of polarization, the first and the second polarization direction being different from each other, and the measurement system also comprises a detection unit 150 to simultaneously detect a first and a second intensity of reflected light 145, the first intensity corresponding to light reflected from the first region of the light beam in the target position 160, and the second intensity corresponding to light reflected from the second region of the light beam in the target position 160, and the measurement system further comprises a processor being

Abstract: A pulsed laser skin treatment device is for laser induced optical breakdown of hair or skin tissue. A beam scanning system scans the beam to define a circular or arc path, using a rotated prism which implements a lateral shift to the beam. A focusing system at the output side of the beam scanning system focuses the incident light beam into a focal spot in the hair or skin tissue, and it rotates with the prism.

Abstract: There is provided a cutting element for use in a hair cutting device. The cutting element comprises an optical waveguide having a sidewall which is substantially parallel to the longitudinal axis of the optical waveguide, wherein a portion of the sidewall forms a cutting face for contacting hair. The cutting face has a structure comprising a plurality of indentations configured to allow light to couple out through the sidewall to increase the amount of light able to couple to hair. A hair cutting device comprising a light source and the cutting element is also provided.