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Q: Quantenoptik und Photonik
Q 27: Erzeugung ultrakurzer Lichtimpulse
Q 27.4: Talk
Tuesday, March 14, 2006, 14:30–14:45, HIV
Control of carrier-envelope phase by a composite glass plate — •Richard Ell1,2, Jonathan R. Birge1 und Franz X. Kaertner1 — 1Massachusetts Institute of Technology, USA — 2Nanolayers GmbH, Germany
Using a novel composite glass plate we demonstrate control of the carrier-envelope (CE) phase practically without altering chirp, energy and temporal width of the transmitted few-cycle femtosecond pulses. The basic idea is to vary the ratio of two materials thereby changing the ratio of group and phase velocities whereas the total dispersion stays nearly unaltered.
*Dispersion neutral* variation of the CE phase and its temporal evolution inside a fs-laser, the CE frequency f_ce, is very important in electric field sensitive time domain applications where the CE phase needs to be adjusted without changing the pulse duration. In frequency metrology, it is necessary to shift a laser comb line relative to an optical reference frequency by adjusting f_ce. Also technically, many experiments require particular values for f_ce due to frequency selective detection schemes, pulse-picking constraints or limitations in the control electronics.
The concept is demonstrated external to a laser in an interferometric autocorrelator where we continuously tune the CE phase by 2Pi. Implementation of the glass plate into an octave-spanning Ti:sapphire laser allows us to continuously vary f_ce over half the repetition rate with negligible variation in the f_ce beat signal strength and spectrum.