Near-complete stored energy extraction from fiber amplifiers in ultrashort >10mJ energy pulses using coherent pulse stacking amplification (Conference Presentation)

Hanzhang Pei; John Ruppe; Siyun Chen; Morteza Sheikhsofla; John Nees; Yawei Yang; Russell Wilcox; Wim Leemans; Almantas Galvanauskas

doi:10.1117/12.2291303

14 March 2018 Near-complete stored energy extraction from fiber amplifiers in ultrashort ⪆10mJ energy pulses using coherent pulse stacking amplification (Conference Presentation)

Hanzhang Pei, John Ruppe, Siyun Chen, Morteza Sheikhsofla, John Nees, Yawei Yang, Russell Wilcox, Wim Leemans, Almantas Galvanauskas

Author Affiliations +

Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 1051209 (2018) https://doi.org/10.1117/12.2291303
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

10mJ energy extraction from a single Yb-doped 85µm core CCC fiber has been achieved using coherent pulse stacking amplification (CPSA) technique. This has been achieved by amplifying a burst of 81 stretched pulses with modulated amplitudes and phases, in a Yb-doped fiber CPA system where it is amplified to 10mJ with low nonlinearity, and coherently stacked into a single pulse with 4+4 cascading GTI cavities. The burst is generated by sending femtosecond pulses from a 1GHz repetition rate mode-locked fiber oscillator into a pair of amplitude and phase electro-optic modulators, where the burst is carved out and pre-shaped to compensate for strong saturation effect in fiber CPA system and to provide correct relative phases for coherent pulse stacking. After each pulse is stretched to approximately 1-ns, the burst is amplified through several cascading fiber amplifiers and down-counted to 1kHz repetition rate, and it extracts >90% stored energy from the last Yb-doped 85µm core CCC fiber. This multi-mJ burst of 81 pulses is then coherently stacked into a single pulse in 4+4 multiplexed GTI cavities consisting of 4 sets of 1ns-roundtrip cavities followed by 4 sets of 9-ns roundtrip cavities. After stacking, the stretched pulse is compressed to <540fs using diffraction-grating pulse compressor. CPSA enables generation of multi-mJ femtosecond pulses with one fiber amplifier channel.

Conference Presentation

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Hanzhang Pei, John Ruppe, Siyun Chen, Morteza Sheikhsofla, John Nees, Yawei Yang, Russell Wilcox, Wim Leemans, and Almantas Galvanauskas "Near-complete stored energy extraction from fiber amplifiers in ultrashort ⪆10mJ energy pulses using coherent pulse stacking amplification (Conference Presentation)", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 1051209 (14 March 2018); https://doi.org/10.1117/12.2291303

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KEYWORDS

Fiber amplifiers

Femtosecond phenomena

Electrooptic modulators

Mode locking

Modulation

Multiplexing

Oscillators

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