Cutting device with optical coupler including a polarisation corrector

A therapy device including a casing and a hinged arm mounted on the casing, the hinged arm including a plurality of arm segments connected by hinges, wherein the therapy device further comprises a cutting apparatus for cutting human or animal tissue, said apparatus including:

• a laser source configured for emitting a treatment laser beam in the form of pulses,
• a shaping system positioned downstream of the laser source, configured for transforming the treatment laser beam into a single phase-modulated treatment laser beam, wherein the shaping system modulates the phase of the wavefront of the treatment laser beam according to a modulation set value calculated to distribute the energy of the single phase-modulated treatment laser beam into at least two impact points forming a pattern in a focusing plane,
• an optical coupler between the laser source and the shaping system, wherein said optical coupler includes a photonic crystal fiber, and
• a polarization corrector mounted between the laser source and the shaping system and configured for modifying the polarization of the treatment laser beam upstream of the optical coupler wherein the polarization of the treatment laser beam downstream of the optical coupler corresponds to a desired reference polarization, and wherein the polarization corrector comprises:
• a sensor configured for measuring a polarization variation between an input end of the optical coupler and an output end of the optical coupler, and
• a polarization modifier configured for modifying the polarization of the treatment laser beam upstream of the optical coupler so as to compensate for the measured polarization variation,
• the shaping system, the sweeping optical scanner and the optical focusing system being mounted in an end segment of the hinged arm, the laser source and the control unit being integrated into the casing.