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K: Fachverband Kurzzeitphysik
K 4: Lasersysteme und -komponenten
K 4.5: Talk
Tuesday, February 26, 2013, 12:30–12:45, HS 4
Towards high-power CEP-stabilized few-cycle thin-disk oscillators — Oleg Pronin1, •Marcus Seidel2, Jonathan Brons2, Fabian Lücking1, Ivan B. Angelov2, Vladimir Pervak1, Alexander Apolonskiy1,2, and Ferenc Krausz1,2 — 1Ludwig-Maximilians-Universität München, Garching, Germany — 2Max-Planck Institut für Quantenoptik, Garching, Germany
The thin-disk laser concept made it possible to achieve average output powers of more than 100 W, pulse energies of several tens of µJ and pulse durations below 200 fs directly from a mode-locked Yb:YAG oscillator. In contrast, Ti:Sa-oscillators reach only a few Watts of output power. However, they can operate in a few-cycle regime. Such short pulses cannot be directly generated in a thin-disk oscillator due to the limited bandwidth of the gain medium. To overcome this problem, the spectrum of a Kerr-lens mode-locked Yb:YAG thin-disk oscillator [1] was broadened in a 35 µm core diameter photonic crystal fiber and compressed by means of chirped mirrors. Overall throughputs of more than 60 % of the incident power and pulses with duration of less than 30 fs were measured. Furthermore, the spectrally broadened and compressed pulses were sent to an f-to-2f interferometer which gave access to the carrier envelope offset (CEO) frequency. In order to gain higher intrinsic CEO frequency stability, the intensity noise fluctuations of the oscillator were characterized and reduced. Finally, the CEO frequency fluctuations were decreased through a feedback loop that controlled the oscillator pump diodes current.
[1] O. Pronin et al., Optics Letters 36, 4746 (2011)