Quantum mechanics

Raman scattering

Raman spectroscopy

Laser power scaling

Materials science

Power (physics)

Watt

Wavelength

Photonic-crystal fiber

Raman laser

Laser

Physics

Mathematics

Optics

Nanosecond

Supercontinuum

Laser pumping

Fiber laser

Optoelectronics

IEEE Photonics Technology Letters

We report the demonstration of a 4.42-μm silica-fiber-based Raman laser delivering a record average output power of 1.4 W and operating in a single transversal mode. The Raman laser is based on a hydrogen-filled hollow-core silica fiber, which is pumped by a nanosecond erbium-doped fiber laser at 1.56 μm. In spite of a large quantum defect of a 1.56-4.42-μm conversion, the Raman laser demonstrates no heat-initiated problems. Due to the implementation of a linearly polarized pump and virtually all-polarization-maintaining configuration of the Raman laser, the quantum efficiency has reached 53%, which is a theoretical limit imposed by optical losses (1.1 dB/m) at 4.42 μm in a state-of-the-art revolver hollow-core silica fiber. The developed laser demonstrates the prospects of gas fiber Raman lasers to serve as pump sources for high-power supercontinuum generation in the mid-infrared spectral range. Such sources can find numerous scientific and biomedical applications.

Watt-Level Nanosecond 4.42-&lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;$\mu$ &lt;/tex-math&gt; &lt;/inline-formula&gt;m Raman Laser Based on Silica Fiber

Watt-Level Nanosecond 4.42-&lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;$\mu$ &lt;/tex-math&gt; &lt;/inline-formula&gt;m Raman Laser Based on Silica Fiber

Watt-Level Nanosecond 4.42-<inline-formula> <tex-math notation="LaTeX">$\mu$ </tex-math> </inline-formula>m Raman Laser Based on Silica Fiber