Erbium:ytterbium fiber-laser system delivering watt-level femtosecond pulses using divided pulse amplification

Robert Herda; Armin Zach

doi:10.1117/12.2079550

4 March 2015 Erbium:ytterbium fiber-laser system delivering watt-level femtosecond pulses using divided pulse amplification

Robert Herda, Armin Zach

Author Affiliations +

Proceedings Volume 9344, Fiber Lasers XII: Technology, Systems, and Applications; 93441E (2015) https://doi.org/10.1117/12.2079550
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

We present an Erbium:Ytterbium codoped fiber-amplifer system based on Divided-Pulses-Amplification (DPA) for ultrashort pulses. The output from a saturable-absorber mode-locked polarization-maintaining (PM) fiber oscillator is amplified in a PM normal-dispersion Erbium-doped fiber. After this stage the pulses are positively chirped and have a duration of 2.0 ps at an average power of 93 mW. A stack of 5 birefringent Yttrium-Vanadate crystals divides these pulses 32 times. We amplify these pulses using a double-clad Erbium:Ytterbium codoped fiber pumped through a multimode fiber combiner. The pulses double pass the amplifier and recombine in the crystals using non-reciprocal polarization 90◦ rotation by a Faraday rotating mirror. Pulses with a duration of 144 fs are obtained after separation from the input beam using a polarizing beam splitter cube. These pulses have an average power of 1.85 W at a repetition rate of 80 MHz. The generation of femtosecond pulses directly from the amplifier was enabled by a positively chirped seed pulse, normally dispersive Yttrium-Vanadate crystals, and anomalously dispersive amplifier fibers. Efficient frequency doubling to 780 nm with an average power of 725 mW and a pulse duration of 156 fs is demonstrated. In summary we show a DPA setup that enables the generation of femtosecond pulses at watt-level at 1560 nm without the need for further external dechirping and demonstrate a good pulse quality by efficient frequency doubling. Due to the use of PM fiber components and a Faraday rotator the setup is environmentally stable.

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Robert Herda and Armin Zach "Erbium:ytterbium fiber-laser system delivering watt-level femtosecond pulses using divided pulse amplification", Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 93441E (4 March 2015); https://doi.org/10.1117/12.2079550

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KEYWORDS

Crystals

Picosecond phenomena

Femtosecond phenomena

Polarization

Phase modulation

Beam splitters

Laser crystals

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