Method for generation of ultrashort light pulses comprising the steps of: a) generating a first-harmonic laser beam of chirped pulses defined by a first central frequency ω 1 and pulse duration Δ t ω, chirped; b) amplifying said first-harmonic laser beam of chirped pulses, thus providing amplified first-harmonic laser beam of chirped pulses defined by the first central frequency ω 1 and spectral width Δ ω 1; duration of chirped pulses of the laser beam is longer than a bandwidth-limited duration Δ t ω,BL; c) generating a second-harmonic laser beam of chirped pulses by the means of second harmonic generation in a quadratic nonlinear medium, wherein said laser beam is defined by a second central frequency ω 2 =2 ω 1, spectral width Δ ω 2 and pulse duration Δ t 2ω,chirped; d) compressing pulses of said second-harmonic laser beam of chirped pulses, thus forming an output laser beam of ultrashort light pulses with pulse duration Δ t 2ω shorter than said bandwidth-limited pulse duration Δ t ω,BL of the amplified first-harmonic laser beam, - in the step (a), the first-harmonic laser beam of chirped pulses is formed from an initial laser beam by the means of pulse stretching; a spectral width Δ ω IN of said initial laser beam corresponds to a bandwidth-limited pulse duration equal to a few picoseconds; - the duration Δ t ω,chirped of chirped pulses of the first-harmonic laser beam formed in the step (a) is at least 10 times longer than its bandwidth-limited pulse duration Δt w.BL, characterized in that - an amplification factor of a quantum amplifier for carrying out the step (b) is selected so that, in combination with other optical parameters of steps being performed in this method for generation of ultrashort light pulses, ensures energy conversion efficiency to second-harmonic radiation in the step (c) not lower than 70% in order to attain the spectral width Δ ω 2 at least 1.7 times broader than the spectral width Δ ω 1 and said pulse duration Δ t 2ω by not less than 1.7 times shorter than said pulse duration Δ t ω,BL, - whereas the ultrashort light pulses in the output laser beam are high energy light pulses having an energy from 1mJ to hundreds of mJ. a) generating a first-harmonic laser beam of chirped pulses defined by a first central frequency ω 1 and pulse duration Δ t ω, chirped; b) amplifying said first-harmonic laser beam of chirped pulses, thus providing amplified first-harmonic laser beam of chirped pulses defined by the first central frequency ω 1 and spectral width Δ ω 1; duration of chirped pulses of the laser beam is longer than a bandwidth-limited duration Δ t ω,BL; c) generating a second-harmonic laser beam of chirped pulses by the means of second harmonic generation in a quadratic nonlinear medium, wherein said laser beam is defined by a second central frequency ω 2 =2 ω 1, spectral width Δ ω 2 and pulse duration Δ t 2ω,chirped; d) compressing pulses of said second-harmonic laser beam of chirped pulses, thus forming an output laser beam of ultrashort light pulses with pulse duration Δ t 2ω shorter than said bandwidth-limited pulse duration Δ t ω,BL of the amplified first-harmonic laser beam, - in the step (a), the first-harmonic laser beam of chirped pulses is formed from an initial laser beam by the means of pulse stretching; a spectral width Δ ω IN of said initial laser beam corresponds to a bandwidth-limited pulse duration equal to a few picoseconds; - the duration Δ t ω,chirped of chirped pulses of the first-harmonic laser beam formed in the step (a) is at least 10 times longer than its bandwidth-limited pulse duration Δt w.BL, characterized in that - an amplification factor of a quantum amplifier for carrying out the step (b) is selected so that, in combination with other optical parameters of steps being performed in this method for generation of ultrashort light pulses, ensures energy conversion efficiency to second-harmonic radiation in the step (c) not lower than 70% in order to attain the spectral width Δ ω 2 at least 1.7 times broader than the spectral width Δ ω 1 and said pulse duration Δ t 2ω by not less than 1.7 times shorter than said pulse duration Δ t ω,BL, - whereas the ultrashort light pulses in the output laser beam are high energy light pulses having an energy from 1mJ to hundreds of mJ. - in the step (a), the first-harmonic laser beam of chirped pulses is formed from an initial laser beam by the means of pulse stretching; a spectral width Δ ω IN of said initial laser beam corresponds to a bandwidth-limited pulse duration equal to a few picoseconds; - the duration Δ t ω,chirped of chirped pulses of the first-harmonic laser beam formed in the step (a) is at least 10 times longer than its bandwidth-limited pulse duration Δt w.BL, characterized in that - an amplification factor of a quantum amplifier for carrying out the step (b) is selected so that, in combination with other optical parameters of steps being performed in this method for generation of ultrashort light pulses, ensures energy conversion efficiency to second-harmonic radiation in the step (c) not lower than 70% in order to attain the spectral width Δ ω 2 at least 1.7 times broader than the spectral width Δ ω 1 and said pulse duration Δ t 2ω by not less than 1.7 times shorter than said pulse duration Δ t ω,BL, - whereas the ultrashort light pulses in the output laser beam are high energy light pulses having an energy from 1mJ to hundreds of mJ.