We report on a passively mode-locked all-fiber laser oscillator at 1.5 µm based on heavily doped phosphate-glass active fiber. An active fiber only 20 cm long is sufficient to produce as much as 2.4 W of average output power directly from the oscillator. The width of the mode-locked pulses varies from 8 ps at the lowest output power in the mode-locked state to 44 ps at the highest power. Our picosecond laser oscillator features a high repetition rate of 95 MHz and high peak pulse power of ∼540 W. The oscillator combines the convenience of all-fiber construction with power performance that was previously achievable only with mode-locked bulk-optic laser oscillators or more complex systems involving fiber amplifiers.
© 2006 Optical Society of America
Lasers and Laser Optics
Original Manuscript: October 6, 2005
Revised Manuscript: November 3, 2005
Manuscript Accepted: November 5, 2005
Pavel Polynkin, Alexander Polynkin, Dmitriy Panasenko, N. Peyghambarian, Masud Mansuripur, and Jerome Moloney, "All-fiber passively mode-locked laser oscillator at 1.5 µm with watts-level average output power and high repetition rate," Opt. Lett. 31, 592-594 (2006)