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Proceedings Paper

Multi-mJ energy extraction using Yb-fiber based coherent pulse stacking amplification of fs pulses (Conference Presentation)
Author(s): John M. Ruppe; Hanzhang Pei; Siyun Chen; Morteza Sheikhsofla; Russell B. Wilcox; John A. Nees; Almantas Galvanauskas

Paper Abstract

We report multi-mJ energy (>5mJ) extraction from femtosecond-pulse Yb-doped fiber CPA using coherent pulse stacking amplification (CPSA) technique. This high energy extraction has been enabled by amplifying 10’s of nanosecond long pulse sequence, and by using 85-µm core Yb-doped CCC fiber based power amplification stage. The CPSA system consists of 1-GHz repetition rate mode-locked fiber oscillator, followed by a pair of fast phase and amplitude electro-optic modulators, a diffraction-grating based pulse stretcher, a fiber amplifier chain, a GTI-cavity based pulse stacker, and a diffraction grating pulse compressor. Electro-optic modulators are used to carve out from the 1-GHz mode-locked pulse train an amplitude and phase modulated pulse burst, which after stretching and amplification, becomes equal-amplitude pulse burst consisting of 27 stretched pulses, each approximately 1-ns long. Initial pulse-burst shaping accounts for the strong amplifier saturation effects, so that it is compensated at the power amplifier output. This 27-pulse burst is then coherently stacked into a single pulse using a multiplexed sequence of 5 GTI cavities. The compact-footprint 4+1 multiplexed pulse stacker consists of 4 cavities having rountrip of 1 ns, and one Herriott-cell folded cavity - with 9ns roundtrip. After stacking, stretched pulses are compressed down to the bandwidth-limited ~300 fs duration using a standard diffraction-grating pulse compressor.

Paper Details

Date Published: 21 April 2017
PDF: 1 pages
Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 1008303 (21 April 2017); doi: 10.1117/12.2253464
Show Author Affiliations
John M. Ruppe, Univ. of Michigan (United States)
Hanzhang Pei, Univ. of Michigan (United States)
Siyun Chen, Univ. of Michigan (United States)
Morteza Sheikhsofla, Univ. of Michigan (United States)
Russell B. Wilcox, Lawrence Berkeley National Lab. (United States)
John A. Nees, Univ. of Michigan (United States)
Almantas Galvanauskas, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 10083:
Fiber Lasers XIV: Technology and Systems
Craig A. Robin; Ingmar Hartl, Editor(s)

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