Patent ID: 9622817
Date: 2017-04-18
CPC Classifications: A61B

Claim:
1. A device for shortening hairs, the device comprising: a laser source configured to generate a plurality of laser pulses at peak power density for a predetermined pulse time; an optical system configured to focus the plurality of laser pulses into each of a plurality of spatially separated focal spots within a single hair such that at least three of the plurality of focused laser pulses overlap in time and co-operate to reduce a total power required and the peak power density of each of the at least three laser pulses in the respective focal spots with the peak power density at least equal to a first characteristic threshold value at which a laser induced optical breakdown phenomenon occurs in the hair tissue wherein fractures in the hair result between the respective focal spots and to below a second characteristic threshold value at which a laser induced optical breakdown phenomenon occurs in the skin tissue; and an optical manipulator configured to position the respective at least three focal spots into respective target positions substantially in a 2D plane within the single hair, wherein the optical system is further configured such that a focal spot positioned substantially within the medulla of the single hair has an increased power over each of others of the plurality of spatially separated focal spots not positioned substantially within the medulla of the single hair.