Ultrashort-pulse laser systems are an enabling technology for numerous applications. The stability of such systems is especially crucial for frequency metrology and high precision spectroscopy. Thulium-based fiber lasers are an ideal starting point as a reliable and yet powerful source for the nonlinear conversion towards the mid-IR region. Recently, we have demonstrated that nonlinear self-compression in a fused silica solid-core fiber allows for few-cycle pulse duration with up to 24 MW peak power using a high-repetition rate thulium-based fiber laser system operating at around 2 μm wavelength . This experiment operates near the self-focusing limit of about 24 MW for circular polarization, which increases the requirements for the system stability due to the risk of a fiber damage. Here, we present a self-protecting nonlinear compression regime allowing for long-term operation and high output-pulse stability with very similar output performance.
Fabian Stutzki, Christian Gaida, Martin Gebhardt, Cesar Jauregui, Jens Limpert, Andreas Tünnermann, and Ioachim Pupeza, "Self-protecting nonlinear compression in a solid fiber for long-term stable ultrafast lasers at 2 μm wavelength," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830D (Presented at SPIE LASE: January 30, 2017; Published: 22 February 2017); https://doi.org/10.1117/12.2252662.
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