Patent ID: 6625180
Filing Date: 2003-09-23
Classification: H01S

Abstract:
A Raman fiber laser comprising:a length of a phosphosilicate fiber as the active medium, the makeup of the fiber including SiO2 and P2O5; a pumping source of optical radiation with a frequency of &ugr;o; at least two pairs of Bragg gratings as reflectors; wherein each said pair of Bragg gratings forms an optical resonator including at least a portion of the phosphosilicate fiber; wherein the frequency &ugr;o of said pumping source of optical radiation and a frequency of each optical resonator &ugr;i, where i=1, . . . ,N, are set in such a manner that a part of the values of the frequency differences &Dgr;&ugr;i=&ugr;i-1âˆ’&ugr;i belongs to a range of 1305-1355 cmâˆ’1, Raman amplification which is due to the presence P2O5 in the phosphosilicate fiber, while the remaining values of the frequency differences &Dgr;&ugr;i belong to a range of 50-560 cmâˆ’1, Raman amplification which is due to the presence of SiO2 in the phosphosilicate fiber, wherein there is at least one value of &Dgr;&ugr;i in each of the P2O5 and SiO2 ranges.