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Sub-two-cycle octave-spanning mid-infrared fiber laser

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Huang,  Jiapeng
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Pang,  Meng
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences;

Jiang,  Xin
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Köttig,  Felix
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

Schade,  Daniel
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

He,  Wenbin
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

Butryn,  Martin
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  Philip
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;
Department of Physics, Friedrich-Alexander-Universität;

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Citation

Huang, J., Pang, M., Jiang, X., Köttig, F., Schade, D., He, W., et al. (2020). Sub-two-cycle octave-spanning mid-infrared fiber laser. Optica, 7(6), 574-579. doi:10.1364/OPTICA.389143.


Cite as: https://hdl.handle.net/21.11116/0000-0006-6D29-3
Abstract
Compact and powerful ultrafast light sources at high pulse repetition rates, based on mode-locked near infrared fiber lasers, are now widely available and are being used in applications such as frequency metrology, molecular spectroscopy, and laser micro-machining. The realization of such lasers in the mid-infrared has, however, remained a challenge for many years. Here we report a record-breaking three-stage fiber laser system that uses an Er-doped fluoride fiber as gain medium, delivering W-level few-cycle pulses at 2.8 µm at a repetition rate of 42.1 MHz. A fiber-based seed oscillator, cavity dispersion-managed by a pulse-stretcher, generates near-100-fs mid-infrared pulses with >110nm spectral bandwidth. These pulses are amplified to an average power of ∼1 W in a chirp-engineered fiber amplifier, and then compressed to ∼16 fs in a short length of highly nonlinear ZBLAN fiber, resulting in a more-than-octave-wide spectrum reaching from 1.8 µm to 3.8 µm with a total power of 430 mW.