In this paper we present the most recent results on the optimization of the carrier-envelope phase (CEP) stabilization of a Yb:KGW laser system and parametric amplifiers. The implementation of several CEP locking techniques and their combinations allowed us to reduce the RMS phase noise of the oscillator to the values below 100 mrad and demonstrate the operation of the whole laser system with the CEP jitter of 170 mrad. The active and passive CEP stabilization for parametric amplifiers was tested. The operation of optical parametric amplifiers in the passive CEP stabilization regime with an additional slow feedback loop providing the CEP jitter as low as 70 mrad over 6 hours was demonstrated.

Keywords: carrier-envelope phase, CEP, phase noise, frequency comb, Yb:KGW mode-locked laser
PACS: 42.30.Rx, 42.60.Jf, 42.60.Mi

Yb:KGV LAZERIO IR OPTINIŲ PARAMETRINIŲ STIPRINTUVŲ IMPULSŲ GAUBTINĖS FAZINIO POSLINKIO VALDYMAS
T. Stanislauskas^a,b, R. Antipenkov^a, V. Martinėnaitė ^a,b, L. Karpavičius^a, A. Varanavičius^a, P. Mišeikis ^b, D. Grigaitis^b, D. Mikalauskas^b,
R. Karkockas^b, V. Sinkevičius^b, L. Giniūnas^b , R. Danielius^b, T. Balčiūnas^c, A. Pugžlys^c , A. Baltuška^c, B. Schmidt^d
aVilniaus universiteto Fizikos fakulteto Kvantinės elektronikos katedra, Vilnius, Lietuva
^bUAB „Šviesos konversija“, Vilnius, Lietuva
^cVienos technologijos universiteto Fotonikos institutas, Viena, Austrija
^d„Menlo Systems GmbH“, Martinsried, Vokietija

Pristatomi naujausi Yb:KGV lazerio bei optinių parametrinių stiprintuvų (OPS) impulsų gaubtinės fazinio poslinkio (GFP) stabilizavimo rezultatai. Panaudojus kelis fazės stabilizavimo metodus bei jų derinius, lazerio osciliatoriaus impulsų GFP nuokrypius pavyko apriboti iki mažesnių kaip 100 mrad reikšmių. Minimali išmatuota GFP nuokrypio vertė visai lazerinei sistemai – 170 mrad. Parametriniais stiprintuvais išbandyti tiek aktyvūs, tiek ir pasyvūs GFP stabilizavimo būdai. Panaudojus papildomą grįžtamąjį ryšį, pasyviai stabilizuotų skirtuminių OPS impulsų fazės vidutinis kvadratinis nuokrypis 6 val. neviršijo 70 mrad.

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