We have developed a linearly polarized Ytterbiumdoped fiber ring laser with a single longitudinal mode output at 1064 run. A fiber-coupled intracavity phase modulator ensured mode-hop free operation and allowed fast frequency tuning. The fiber laser was locked with high stability to an iodine-stabilized laser, showing a frequency nOIse suppressIOn of a factor,...., 10 at 1 ':IlHz 50"", DET Conf...