LASER SYSTEM AND METHOD FOR CONTROLLING THE LASER PULSE SHAPE

摘要

A laser system for medical treatment is disclosed which comprises a pump, wherein the laser system is adapted to be operated in pulsed operation so that at least one laser pulse of a temporally limited pulse duration (Tp) is generated. The generated laser pulse irradiates some part of the human or animal body so that a two-dimensional laser spot S is located on the top layer of the irradiated part of the human or animal body. The pump power of the pump of the laser system is modulated in such a way that the cumulative energy ES(Tp/2) which is delivered by said laser pulse to said laser spot S during the first half of the pulse duration is less than 45% of the energy ES(Tp) which is delivered by said laser pulse to said laser spot S during the entire pulse duration Tp.

主权项

1. Laser system for medical treatment, comprising:
a pump, wherein the laser system is adapted to be operated in pulsed operation so that at least one laser pulse of a temporally limited pulse duration (Tp) is generated, wherein said laser pulse irradiates some part of the human or animal body so that a two-dimensional laser spot S is located on the top layer of the irradiated part of the human or animal body; and wherein the pump power of the pump is modulated in such a way that the cumulative energy ES(Tp/2) which is delivered by said laser pulse to said laser spot S during the first half of the pulse duration is less than 45% of the energy ES(Tp) which is delivered by said laser pulse to said laser spot S during the entire pulse duration Tp, wherein said laser pulse comprises a plurality of micro-pulses, wherein in between two micro-pulses of the laser pulse there is a temporal region of the pulse where the pulse intensity is smaller than 1/10th of the maximal pulse intensity for the neighboring two micro-pulses, and wherein the time duration of the temporal region of the pulse where the pulse intensity is smaller than 1/10th of the maximal pulse intensity for the neighboring two micro-pulses lies between 0.1 microseconds and 2 milliseconds.