FIELD: physics.
SUBSTANCE: proposed method comprises advancing laser pulse through converter nonlinear crystal. Prior to advancing to crystal, laser pulse is frequency chirped, while produced second harmonic impulse in time compressed. Note here that duration of second harmonic pulse after compression is defined from relationship 
where τ is main frequency pulse duration, and τch is chirped pulse duration.
EFFECT: two fold decrease in second harmonic pulse relative to starting femtosecond laser pulse with duration over 100 fs with high-efficiency conversion.
3 dwg
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