We report on the method for picosecond pulse envelope shaping that is based on pulse temporal profile transformations during the cascade second harmonic generation. It was demonstrated theoretically and experimentally that under a particular second harmonic generation condition, e. g. pump pulse intensity and crystal length, the 1064 nm pump pulses with a temporal profile close to the Gaussian one and pulse width of 75 ps at FWHM can be converted to pulses of fundamental and second harmonics with the super-Gaussian temporal profile having an intensity plateau region extending over a ~100 ps time interval when conversion efficiency in the first stage of the harmonic generator was around 45–50%. Our proposed shaping method is particularly suitable for the application in the multistage OPCPA pumped by the second harmonic of Nd:YAG laser radiation.

PACS: 42.65.Yj, 42.65.Re, 42.65.Ky

PLOKŠČIOS VIRŠŪNĖS PIKOSEKUNDINIŲ KAUPINIMO IMPULSŲ PARAMETRINIO STIPRINIMO SISTEMOMS FORMAVIMAS PAKOPINIAIS ANTROSIOS HARMONIKOS GENERATORIAIS
J. Adamonis^a,b, R. Antipenkov^a , J. Kolenda^b,c , A. Michailovas^b,c, A.P. Piskarskas^a,  A. Varanavičius ^a, A. Zaukevičius^a
aVilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva
^bUAB „Ekspla“, Vilnius, Lietuva
^cFizinių ir technologijos mokslų centras, Vilnius, Lietuva

Darbe pristatome metodą, skirtą formuoti pikosekundinių impulsų gaubtinę, naudojant pakopinius antrosios harmonikos generatorius. Eksperimentiškai ir teoriškai parodyta, kad parinkus atitinkamą kaupinimo impulso intensyvumą bei antrosios harmonikos kristalo ilgį, pirmosios harmonikos 1064 nm bangos ilgio ir 75 ps trukmės Gauso formos impulsai tribangės sąveikos metu transformuojami į pirmosios ir antrosios harmonikos impulsus, kurių plokščios impulso gaubtinės sritis viršija 100 ps trukmės intervalą, kai keitimas pirmosios pakopos antrosios harmonikos generatoriuje yra 45–50 %. Siūlomas impulsų gaubtinės formavimo metodas gali būti efektyviai taikomas daugiapakopėse moduliuotos fazės impulsų parametrinėse stiprinimo sistemose

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