Fibre-optic Solc filter for use in Raman amplification of light

Fibre-optic Solc filters, in which five consecutive fibre coils are tilted with respect to each other, have been fabricated. The wavelength of maximum transmittance is designed to coincide with 1.24 ¿m wavelength, and the half-power bandwidth is 61 nm. To show the feasibility of the fibre-optic Solc filter in Raman amplification of light, the third Stokes line (¿=1.24 ¿m) of 1.06 ¿m Nd:YAG laser light from a silica fibre was successfully extracted, while the pump light and other Stokes lines were suppressed below ¿13 dB.