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In this work, we develop a high energy laser at 1.4 {\mu}m wavelength throughthe 1st order vibrational Raman Stokes generation in a nitrogen (N2) fillednodeless anti-resonant hollow core fiber (ARHCF), pumped using a custom-made1060 nm Yb-doped narrow-linewidth fiber laser with 3.7 ns pulse duration and 98{\mu}J pulse energy. The maximum Raman energy of 26.5 {\mu}J is achieved at 15bar N2 pressure, corresponding to a quantum efficiency of 45% and peak power of8.03 kW with 3.3 ns pulse width. This Raman laser has a narrow linewidth of0.16 nm, and it is tunable over ~2 nm range by thermally tuning the laser diodeseed wavelength of the pump fiber laser. This work provides a promisingalternative for developing high energy and narrow-linewidth lasers outside thegain spectral regions of rare earth ion doped fibers.

High energy and narrow linewidth N2-filled hollow-core fiber laser at 1.4 {\mu}m