Cutting assembly for a hair cutting device

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 the hair;
• and
• a cutting assembly coupled to the light source to receive the light, the cutting assembly comprising:
• a cutter;
• and
• a light guide configured to guide the light from the light source to the cutter;
• wherein the cutter includes a first portion of an optical waveguide configured to receive the light from the light guide,
• wherein a sidewall of the first portion of the optical waveguide forms a cutting face for contacting the hair,
• wherein the light guide has a first section configured to receive the light from the light source followed by a taper transition section and a second section, the taper transition section having a decreasing diameter decreasing from a first end to a second end of the taper transition section, the first end receiving the light from the first section and the second end being connected to the second section, and
• wherein the second section has a length portion extending from the second end of the taper transition section, the length portion having a constant diameter and including the cutter.