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Phys Rev Lett. 2007 Oct 5;99(14):143903. Epub 2007 Oct 5.

Subwatt threshold cw Raman fiber-gas laser based on H2-filled hollow-core photonic crystal fiber.

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Centre for Photonics & Photonic Materials, Department of Physics, University of Bath, Claverton Down, Bath, UK.


We report on what is, to our knowledge, the first cw pumped Raman fiber-gas laser based on a hollow-core photonic crystal fiber filled with hydrogen. The high efficiency of the gas-laser interaction inside the fiber allows operation in a single-pass configuration. The transmitted spectrum exhibits 99.99% of the output light at the Stokes wavelength and a pump power threshold as low as 2.25 W. The study of the Stokes emission evolution with pressure shows that highly efficient Raman amplification is still possible even at atmospheric pressure. The addition of fiber Bragg gratings to the system, creating a cavity at the Stokes wavelength, reduces the Raman threshold power below 600 mW.

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