Cutting head for a device for cutting hair

A cutting head for a device for cutting hair, comprising:

• a laser generator;
• and
• an optical system configured to focus a laser beam generated by the laser generator and to direct the laser beam along an optical axis across a cutting zone in the cutting head,
• wherein the laser generator and optical system are configured such that, in a focus spot of the laser beam in the cutting zone, a dimension of the focus spot, a power density of the laser beam and a numerical aperture of the laser beam are such that, when a hair is received in the cutting zone, a power output of the laser generator is at a minimum for ensuring that, for a predetermined exposure time, the hair received in the focus spot of the cutting zone is cut by optical absorption,
• wherein the dimension of the focus spot comprises a horizontal dimension that corresponds with a horizontal focus spot size, and a vertical dimension that corresponds with a vertical focus spot size,
• wherein the horizontal focus spot size corresponds to a diameter of the hair to be cut, and
• wherein the numerical aperture is equal to or less than 0.8.