2023/12/06 by Lujun Hong, Hong, Lujun, Cuiling Zhang +11
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #FOS: Physical sciences #Optics (physics.optics) #Photonic Crystal and Fiber Optics #Solid State Laser Technologies
paper · pdf · doi:10.48550/arxiv.2312.03581
openalex publication_date 2023/12/06 · openalex created_date 2023/12/08 · openalex updated_date 2026/07/28
In this work, we develop a high energy laser at 1.4 μm wavelength through the 1st order vibrational Raman Stokes generation in a nitrogen (N2) filled nodeless anti-resonant hollow core fiber (ARHCF), pumped using a custom-made 1060 nm Yb-doped narrow-linewidth fiber laser with 3.7 ns pulse duration and 98 μJ pulse energy. The maximum Raman energy of 26.5 μJ is achieved at 15 bar N2 pressure, corresponding to a quantum efficiency of 45% and peak power of 8.03 kW with 3.3 ns pulse width. This Raman laser has a narrow linewidth of 0.16 nm, and it is tunable over ~2 nm range by thermally tuning the laser diode seed wavelength of the pump fiber laser. This work provides a promising alternative for developing high energy and narrow-linewidth lasers outside the gain spectral regions of rare earth ion doped fibers.