OPTICAL AMPLIFIER SYSTEM FOR PULSED LASER BASED ON A GUIDING GAIN MEDIUM AND PULSED LASER COMPRISING SAME

摘要

The invention relates to an optical amplifier system for pulsed laser with short or ultra-short and energetic pulses comprising an optical pumping source able to generate a pump wave 6, an elongate amplifying medium 3 comprising an input interface 7 able to receive an optical signal 4 to be amplified, said medium 3 being able to amplify said optical signal 4 propagating along said amplifying medium and to extract an amplified signal 5 and an optical system 10 able to couple the pump wave 6 in the amplifying medium 3 so as to pump said amplifying medium 3 longitudinally. According to the invention, the amplifying medium 3 has a minimum transverse dimension ?3 and the optical system 10 focuses the pump wave 6 inside the gain medium 3, the focused pump wave having a transverse dimension ?6 which is smaller than the dimension ?3 of the medium 3 and a smaller numerical aperture than the numerical aperture of the medium 3, in such a way that said pump wave propagates freely over a part 1 of the amplifying medium 3 and then in a confined manner over a part 2 of the amplifying medium. The invention also relates to a pulsed laser comprising said optical amplifier system.