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  4. Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime
 
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Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime

Auteur(s)
Modsching, Norbert 
Institut de physique 
Paradis, Clément 
Institut de physique 
Brochard, Pierre 
Institut de physique 
Jornod, Nayara 
Institut de physique 
Gürel, Kutan
Kränkel, Christian
Schilt, Stephane 
Institut de physique 
Wittwer, Valentin 
Institut de physique 
Südmeyer, Thomas 
Institut de physique 
In
Optics Express, Optical Society of America, 2018/26/22/28461-28468
Résumé
We demonstrate the carrier-envelope offset (CEO) frequency stabilization of a Kerr lens mode-locked Yb:Lu<sub>2</sub>O<sub>3</sub> thin-disk laser oscillator operating in the strongly self-phase modulation (SPM) broadened regime. This novel approach allows overcoming the intrinsic gain bandwidth limit and is suited to support frequency combs from sub-100-fs pulse trains with very high output power. In this work, strong intra-oscillator SPM in the Kerr medium enables the optical spectrum of the oscillating pulse to exceed the bandwidth of the gain material Yb: Lu<sub>2</sub>O<sub>3</sub> by a factor of two. This results in the direct generation of 50-fs pulses without the need for external pulse compression. The oscillator delivers an average power of 4.4 W at a repetition rate of 61 MHz. We investigated the cavity dynamics in this regime by characterizing the transfer function of the laser output power for pump power modulation, both in continuous-wave and mode-locked operations. The cavity dynamics in mode-locked operation limit the CEO modulation bandwidth to ~10 kHz. This value is sufficient to achieve a tight phase-lock of the CEO beat via active feedback to the pump current and yields a residual in-loop integrated CEO phase noise of 197 mrad integrated from 1 Hz to 1 MHz.
Identifiants
https://libra.unine.ch/handle/123456789/3334
_
10.1364/OE.26.028461
Type de publication
journal article
Dossier(s) à télécharger
 main article: Modsching_N.-Carrier-envelope_offset-20181019.pdf (1.24 MB)
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