System for laser photocoagulation of the retina

A system for laser photocoagulation of a retina comprising:

• a photocoagulation laser comprising a laser source and an optical transport fiber,
• an optical path connecting a photocoagulation laser to a laser output to be placed in front of the retina, so that a laser beam emitted by the photocoagulation laser propagates along the optical path in a propagation direction, the propagation direction being oriented from the photocoagulation laser to the laser output, so that the photocoagulation laser is located upstream the laser output with respect to the propagation direction, said laser beam having a wavefront,
• wherein the laser source is a laser source configured to emit in a wavelength comprised between 520 nm and 690 nm in the optical transport fiber, and the optical transport fiber has a core with adiameter less than 50 μm,
• the system for laser photocoagulation comprising:
• an adaptive optics positioned in the optical path and configured to modify the wavefront of the laser beam propagating along the optical path in order to compensate ocular aberrations occurring up to the retina,
• an imager configured to acquire an image of the retina based on light transported from the retina to the imager, the light following the optical path from the laser output to an extraction point, the light exiting the optical path at the extraction point, the extraction point being located in the optical path downstream of the photocoagulation laser and upstream of the adaptive optics with respect to the propagation direction,
• a first actuator being different from the adaptive optics, the first actuator being positioned in the optical path downstream of the adaptive optics with respect to the propagation direction, said first actuator configured to control a position of the laser output with respect to the retina, and
• a position control loop controlling the first actuator to servo-control the position of the laser output with respect to the retina, on the basis of an image of the retina derived from the optical path and acquired by the imager.