Method and system for optically bleaching keratinous fibers

A method of treating keratinous fibers for at least partially bleaching the fibers, in which at least one region to be treated is exposed to at least one light pulse generated by a diode-pumped laser or by a regenerative amplifier laser.

A method of treating keratinous fibers for at least partially bleaching the keratinous fibers, during which at least one region to be treated is exposed to at least one light pulse, the duration over which a light power of the pulse reaching the fibers is equal to or greater than one half of a peak power being between about 100 ps and about 1 μs.

A system for optically bleaching keratinous fibers, comprising:

• a regenerative amplifier laser or diode-pumped laser for emitting light pulses;
• and
• a treatment head configured to expose keratinous fibers to the light pulses generated by the laser.

A system for bleaching keratinous fibers, comprising:

• a laser for emitting light pulses;
• and
• a treatment head configured to receive at least one lock of hair to be at least partially bleached and for exposing this lock of hair to the light pulses, the laser being configured so that a duration of a light pulse during which the light power of the pulse is equal to or greater than one half of its peak power is between about 100 ps and about 1 μs.