A system for neural and muscular stimulation, including DBS, cortical and muscle stimulation, heart pacemakers and similar applications. An RFIC provided at a transmission and reception circuit processes a GSM carrier signal belonging to a band of about 824 MHz to about 894 MHz or about 880 MHz to about 960 MHz to execute mobile communication. A device state, which includes the current time and the device position, is then monitored. The MPEG4 encoder 33 encodes the output of the resolutionframe rate converter 31, generating a bit stream of MPEG4 image codes. The optical pumping is temporally divided into n partial pumpings, the optical energy of a partial pumping being a fraction of Etotal, n being an integer 2\u2266n\u2266N and in that the laser beam is injected into the amplifying crystal at least once after each partial pumping. According to the invention the antireflective property is locally amended in order to enhance light beam intensity uniformity.