4.6 Article

Grating-free 2.8 μm Er:ZBLAN fiber chirped pulse amplifier

Journal

HIGH POWER LASER SCIENCE AND ENGINEERING
Volume 10, Issue -, Pages -

Publisher

CHINESE LASER PRESS & CAMBRIDGE UNIV PRESS
DOI: 10.1017/hpl.2022.36

Keywords

Er; ZBLAN fiber; fiber chirped pulse amplifier; grating free; mid-infrared

Categories

Funding

  1. National Natural Science Foundation of China
  2. Chenguang Program
  3. [62075126]
  4. [62005161]

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This study reports on a grating-free fiber chirped pulse amplifier at 2.8 μm for the first time. The system utilized Er:ZBLAN fiber and Ge rods to generate high-energy picosecond pulses with peak power approximately 1.4 MW. The spectral broadening phenomenon observed in the main amplifier is considered meaningful for practical applications in relevant fields.
We report on a grating-free fiber chirped pulse amplifier (CPA) at 2.8 mu m for the first time. The CPA system adopted Er:ZBLAN fiber with large anomalous dispersion as the stretcher and germanium (Ge) rods as the compressor with a compact structure. High-energy picosecond pulses of 2.07 mu J were generated at the repetition rate of 100 kHz. Using highly dispersive Ge rods, the amplified pulses were compressed to 408 fs with a pulse energy of 0.57 mu J, resulting in a peak power of approximately 1.4 MW. A spectral broadening phenomenon in the main amplifier was observed, which was caused by the special gain shape of the Er:ZBLAN fiber amplifier in operation and confirmed by our numerical simulation. This compact fiber CPA system at 2.8 mu m will be practical and meaningful for application fields.

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