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K: Fachverband Kurzzeitphysik
K 4: Lasersysteme und -komponenten
K 4.4: Vortrag
Dienstag, 26. Februar 2013, 12:15–12:30, HS 4
Control of timing jitter in high power optical parametric chirped-pulse amplifiers — •Stefan Demmler1, Steffen Hädrich1,2, Jan Rothhardt1,2, Manuel Krebs1, Jens Limpert1,2, and Andreas Tünnermann1,2,3 — 1Institute of Applied Physics, Abbe Center of Photonics, Friedrich-Schiller-University Jena, Albert-Einstein-Strasse 15, 07745 Jena, Germany — 2Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany — 3Fraunhofer Institute of Applied Optics and Precision Engineering, Albert-Einstein-Strasse 7, 07745 Jena, Germany
A fiber laser pumped ultra broadband optical parametric chirped-pulse amplifier (OPCPA) is presented, which delivers carrier-envelope phase (CEP) stable near infrared pulses with a duration of only two optical cycles at repetition rates of up to 1 MHz. Thanks to pulse energies of tens of microjoules this source provides sufficient peak power for the generation of isolated attosecond pulses via high harmonic generation in noble gases. For this process precise control and stabilization of the CEP of the amplified pulses is indispensable. It is shown that timing jitter between the signal and pump pulses in the OPCPA induces spectral drifts of the amplified signal, which transfer to CEP instabilities via dispersion. Synchronization between both pulses is achieved optically via low jitter soliton shift in a special photonic crystal fiber. In addition, the detection of the angularly dispersed idler allows the implementation of an active feedback loop to eliminate remaining temporal drifts. Furthermore, a new scheme of measuring the CEP drifts in OPCPA systems by utilizing parasitic second harmonic is presented.