YLPP Adjustable Pulse Duration picosecond fiber laser provides up to 1 mJ of pulse energy at variable pulse durations ranging from 150 ps to 5 ns. The repetition rate range is from 30 kHz to 1 MHz. The all fiber format allows for the adjustment of pulse energy and/or pulse repetition rate without affecting any of the output beam parameters. This novel fiber laser is much more efficient and compact than conventional lasers now on the market and is ideal for applications in the solar/ photovoltaic arena, resistor trimming and marking of transparent materials. The ultrashort pulse duration and high peak power result in a very small heat affected zone.