Pulsed fiber lasers with over 12kW peak power, bandwidth-limited spectrum and M~2 <1.1 beams for the 1064nm and 1550nm wavelengths

摘要

We have developed all fiber format pulsed lasers with bandwidth-limited emission and over 12kW peak power for the1064nm and 1550nm wavelength ranges. The master oscillator followed by power fiber amplifier configurations wereemployed with operational frequencies from 100kHz to over 2MHz range and 2ns pulse duration. The pulse durationremains the same for all repetition rates. The designs of the low NA core fibers deployed ensure stable single spatialmode emission with 12μm and 14μm mode field diameter (MFD) for 1064nm and 1550nm correspondingly. The outputemission bandwidth was below 0.1nm and pulse-to-pulse energy stability better than 1% were measured for alloperational frequencies and output powers. Single mode fiber design of the fiber amplifiers ensured diffraction-limitedoutput beam quality with M~2 less than 1.1. New lasers can be used for nonlinear frequency conversion to generateemission in the visible and UV parts of optical spectrum as well as in other applications.