title: High peak-power single-frequency pulses using multiple stage, large core phosphate fibers and preshaped pulses.
abstract: We have developed a monolithic high power pulsed fiber laser in a master oscillator power amplifier (MOPA) configuration, which is capable of reaching 0.38 mJ pulse energy and 128 kW peak power for 3 ns pulses at ~1550 nm while maintaining transform-limited linewidth. The fiber laser pulse seed was achieved by directly modulating a CW single-frequency fiber laser using an electro-optic modulator. We used an arbitrary waveform generator to preshape the fiber laser pulses before amplification to avoid pulse steepening and dynamic gain saturation. Single-mode, polarization maintaining highly Er/Yb codoped large core phosphate fibers were used in the power amplifier stages to scale the transform-limited fiber laser pulses, avoiding any nonlinearities.
authors.affiliation: NP Photonics Inc., Tucson, Arizona 85747, USA.
authors.forename: Eliot
authors.initials: E
authors.lastname: Petersen
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Arturo
authors.initials: A
authors.lastname: Chavez-Pirson
authors.forename: Nasser
authors.initials: N
authors.lastname: Peyghambarian