CONTROLLABLE DUAL-WAVELENGTH OPERATION OF A FEMTOSECOND NEODYMIUM FIBER LASER

Simultaneous asynchronous mode locking of two wavelengths in a Nd3+-do ped fiber laser is reported. The laser operates simultaneously at wave lengths of 1.060 and 1.100 mum, where carrier-type passive mode lockin g is employed for the shorter wavelength and Kerr-type passive mode lo cking is used for the longer wavelength. The difference between the tw o repetition rates may be varied over a range from several megahertz t o 500 Hz, limited by the onset of pulse interactions at small differen ce frequencies.