Abstract: A light based skin treatment device comprises a laser light source for providing a pulsed incident light beam for treating skin by laser induced optical breakdown of hair or skin tissue. In one arrangement, a focusing system has a pre-focusing lens for increasing the convergence of the an incident light beam and a skin contact lens having convex light input and light exit surfaces. The focal spot position is controlled by adjusting a spacing between the pre-focusing lens and the skin contact lens. In another arrangement, there is an adjustable lens system before an adjustable focusing system for providing compensation for aberration in the adjustable focusing system.

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 laser light at one or more specific wavelengths corresponding to wavelengths absorbed by one or more chromophores in or on hair; and a cutting element that comprises an optical waveguide that is coupled to the light source to receive laser light, wherein a portion of a sidewall of the optical waveguide forms a cutting face for contacting hair; wherein at least a portion of the cutting face is provided with a first coating or layer that is formed from or comprises a lipophilic material; and wherein at least a portion of the sidewall of the optical waveguide that can contact the skin of the subject has a second coating or layer that is formed from or comprises a lipophobic material.

Abstract: A cutting element for a cutting head for a device for cutting hair is disclosed. A laser beam is directed across a cutting zone, in the cutting head, substantially parallel to a user's skin. The laser beam has an effective cutting region in which the laser beam is of a sufficient intensity to cut hair entering said region. The cutting element has a guard adjacent to the cutting zone to contact a user's skin and space the laser beam there from. The guard has a non-planar shape in a direction extending across the cutting zone so that it substantially follows the contours of an edge of the effective cutting region of the laser beam to reduce any variation in the distance between the edge of the effective cutting region and the user's skin across the length of the cutting zone.

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 laser light at one or more specific wavelengths corresponding to wavelengths absorbed by one or more chromophores in hair; and a cutting element that comprises an optical waveguide that is coupled to the light source to receive laser light, wherein a portion of a side wall of the optical waveguide forms a cutting face for contacting hair, and wherein at least at the cutting face the optical waveguide has a refractive index that is equal to or lower than the refractive index of hair and higher than the refractive index of skin.

Abstract: The invention provides a non-invasive skin treatment device (200) for generating a multiphoton ionization process at a target position (110) in skin tissue (102). The skin treatment device (200) comprises a laser source (105) configured and constructed for generating a laser beam (106), an optical system (109, 112) for focusing the laser beam into the target position below a skin surface (103), and a plasma unit (117) configured and constructed for generating a plasma (100) such that, in use, at least a portion of the plasma penetrates the skin tissue for generating at least one free electron at the target position. The skin treatment device further comprises a control unit (123) configured and constructed for controlling the laser source and the plasma unit such that, in use, at least a portion of the light of the laser beam is absorbed by said at least one free electron generated at the target position, thereby generating the multiphoton ionization process.

Abstract: A shaver is disclosed that comprises a handle (12) and a cutting head (13) that are arranged to move relative to each other via a rotational and/or translational axis (16,17). This movement facilitates skin contour following during shaving to achieve a close cut. The handle (12) comprises a laser source that emits a laser beam and the shaver has an optical system that includes optical elements (23,25,26,37,40,42) to direct a part of a laser beam so that it coincides with the rotational axis and/or is parallel to the translational axis. In this way, when the cutting head (13) is moved the optical alignment between the laser source, optical elements (23,25,26,37,40,42) and cutting zone (28) does not change.

Abstract: A system (101) for treatment of an epithelial tissue layer (3) is provided. The system comprises a reservoir (107), for containing an amount of a flowable medium, arranged to enable the medium, when contained in the reservoir, to be in contact with a surface (5) of the epithelial tissue layer, a light source (109) for generating a laser beam (11) during at least a predetermined pulse time, and an optical system for focusing the laser beam into a focal spot (15), and for positioning the focal spot in a target position. The target position of the focal spot is within the reservoir and within the medium, when contained in the reservoir, and the dimension of the focal spot and the power of the generated laser beam are such that, in the focal spot, the laser beam has a power density, which is above the characteristic threshold value for the medium, above which, for the predetermined pulse time, a laser induced optical breakdown event occurs in the medium.

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 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 method, system and device for shortening hair with the method including generating a plurality of laser pulses overlapping in time; focusing the laser pulses into spatially separated focal spots having a peak power density at least equal to a first threshold at which a laser induced optical breakdown phenomenon occurs in the hair and below a second threshold at which a laser induced optical breakdown phenomenon occurs in skin. Generating the plurality of laser pulses includes an act of generating the plurality of laser pulses to reach the first characteristic threshold value after a start of each corresponding laser pulse in a time span of less than half of the pulse duration; and positioning the respective at least three focal spots into respective target positions within a single hair such that only one of the plurality of laser pulses occur in each of the at least three focal spots.

Abstract: A laser scanning system for scanning a laser beam of a hair cutting device includes a laser scanning device for generating a scanning movement of the laser beam and a movable optical device for adjusting and/or focusing the laser beam. The laser scanning device includes an arrangement with at least one movable optical element which is mechanically coupled to the movable optical device, and an optical system fixed to the laser scanning device. The movable optical element is arranged to inter-relate a position of the movable optical device to a mobile access-position where the laser beam enters the optical system. Further, the optical system is arranged to inter-relate said mobile access-position to at least one corresponding position where the laser beam is incident on the movable optical device.

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: The invention relates to a device (1) for hair-growth control of hairs (3), in particular hairs growing from human skin (5). The device (1) has a laser source (7) for generating a laser beam (9) during a pulse time, an optical system (15) for focusing the laser beam into a focal spot (25), and a laser beam manipulator (17) for positioning the focal spot in a target position. According to the invention, a dimension of the focal spot (25) and a power of the generated laser beam (9) are such that, in the focal spot (25), the laser beam has a power density which is above a characteristic threshold value for hair-growth related skin tissue above which, for the pulse time, a laser induced optical breakdown (LIOB) phenomenon occurs in the hair-growth related skin tissue. The LIOB phenomenon results in a number of mechanical effects, such as cavitation and the generation of shock waves, which damage the hair-growth related skin tissue in positions surrounding the LIOB phenomenon.

Abstract: A measurement system for light-based measurement of collagen, using a first light intensity and a second light intensity according to the invention, compromises a light source (120) for emitting a light beam having a source wavelength range and an optical system (130) to polarize light within the source wavelength range, thereby generating a polarized light beam (140), and to direct and focus the polarized light beam (140) to a target position inside the skin (160) at a predetermined focus depth below an outer surface of the skin.

Abstract: The present application relates to a device (10) for cutting hair. The device has a skin contacting face (13) that is arranged to be placed against a surface of the skin of a user during use. An optical system (20) directs a cutting laser beam (18) across a cutting zone (15) parallel to and spaced from said skin contacting face (13) to cut hairs extending into the cutting zone (15). A laser beam sensor (40) is configured to generate information indicative of one or more optical properties of the cutting laser beam (18). A controller (40) is configured to adjust one or more characteristics of the optical system (20) in dependence on the information generated by the laser beam sensor (40). The present invention also relates to a method of cutting hair and a computer program comprising instructions which, when executed by at least one processor, cause the method to be performed.

Abstract: A device (10) for energy-based skin treatment is provided. The device (10) comprises a light source (18) for providing polarized incident light (21) having an incident polarization, optical elements (11, 12, 13) for focusing the polarized incident light (21) in a focal point (22) within a collagen layer of the skin (30), a polarization-sensitive detection unit (41, 42) for selectively detecting a selected polarization component of light of a generated harmonic (23) of the polarized incident light (21) returning from the skin (30), and a processor, at least being coupled to the polarization-sensitive detection unit (41, 42), for determining a depth of the focal point (22) within the collagen layer based on the detected selected polarization component.

Abstract: A device for cutting hair is disclosed that includes a laser beam generator (2) and a polarisation controller (6) configured to polarise the laser beam (10) and substantially align the polarisation of the laser beam with a longitudinal axis of a hair to be cut. Also disclosed is a method of cutting hair using a laser beam to cut hair. The method including generating and polarising the laser beam to substantially align the polarisation of the laser beam with a longitudinal axis of a hair to be cut.

Abstract: The present application relates to a device (10) for cutting hair. The device (10) has a skin contacting face (13) that is arranged to be placed against a surface of the skin (16) of a user during use, and an optical system (20) configured to direct a cutting laser beam (18) across a cutting zone (15) parallel to and spaced from said skin contacting face (13) to cut hairs (17) extending into the cutting zone (15). The device also has a detector (40) configured to generate information indicative of the presence of one or more objects representative of hair (17) and/or skin (16) in the cutting zone (15), and a controller (27). The controller (27) is able to determine the presence of one or more objects representative of hair (17) and/or skin (16) in the cutting zone (15) and to adjust one or more characteristics of the optical system (20) in dependence on the information generated by the detector (40).

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: The invention relates to a hair-shortening device. The device is based on the principle of laser-induced optical breakdown, wherein a laser pulse causes mechanical effects in tissue, which are used to cut the hair (20). The invention uses the insight that, when two or more such laser pulses are provided simultaneously, the mechanical effects can co-operate. This in turn allows cutting of the hair (20) with less total energy, down to about half the energy required for cases with pulses that are supplied sequentially. In one embodiment, the device comprises a laser source (2), a grating (6), and a beam manipulator (8), that aim a plurality of simultaneous focal spots (10) into a hair (20).