Patent ID: 8582200

Claim:
Chirped pulse fiber amplifier ( 1 ) with nonlinear compensation, comprising: a first element that outputs a light pulse ( 10 ) of initial peak-power P 0 , initial duration T, and the wavelength of which is centred about a value λ 0 ; a stretcher ( 2 ) suitable for temporally stretching the pulse ( 10 ); an amplifying fiber ( 3 ) comprising a doped optical fiber section coupled to optical pumping means ( 4 ), and suitable for amplifying the stretched pulse ( 12 ) so as to produce a pulse of peak-power P; an optical diffraction grating compressor ( 6 ) suitable for temporally compressing the amplified pulse ( 14 ); the stretcher ( 2 ) and the compressor ( 6 ) being mismatched, with a mismatch between the second-order dispersions of the stretcher (β 2E ) and of the compressor (β 2C ) suitable for compensating the second-order nonlinear dispersion (β 2NL ) in the amplifying optical fiber ( 3 ) during the propagation of a pulse of initial peak-power P 0 through the chirped pulse amplifier: β 2E +β 2NL +β 2C =0 and characterized in that: the stretcher ( 2 ) comprises at least one optical diffraction grating ( 7 ), having a grating line density greater than 1200 lines/mm, and which is suitable for having a coefficient β 3 /β 2 lower than −2.5 fs at the power P 0 and the wavelength λ 0 , so as to introduce a temporal asymmetry in the stretched pulse, and in that, during the propagation of the pulse of initial peak-power P 0 through the chirped pulse amplifier, the amplifying fiber ( 3 ) has a coefficient of third-order nonlinear dispersion (β 3NL ) suitable for compensating the difference between the third-order dispersions of the stretcher (β 3E ) and of the compressor (β 3C ): β 3E +β 3NL +β 3C =0.