Abstract
We report on the generation of 34 fs and 50 µJ pulses from a high energy fiber amplifier system with nonlinear compression in an air-filled hypocycloid-core Kagome fiber. The unique properties of such fibers allow bridging the gap between solid core fibers-based and hollow capillary-based post-compression setups, thereby operating with pulse energies obtained with current state-of-the-art fiber systems. The overall transmission of the compression setup is over 70%. Together with Yb-doped fiber amplifier technologies, Kagome fibers therefore appear as a promising tool for efficient generation of pulses with durations below 50 fs, energies ranging from 10 to several hundreds of µJ, and high average powers.
Highlights
The generation of high-energy and ultrashort pulses is usually limited by the available gain bandwidth of ultrashort amplifiers
We report on the generation of 34 fs and 50 μJ pulses from a high energy fiber amplifier system with nonlinear compression in an airfilled hypocycloid-core Kagome fiber
The unique properties of such fibers allow bridging the gap between solid core fibers-based and hollow capillary-based post-compression setups, thereby operating with pulse energies obtained with current state-of-the-art fiber systems
Summary
The generation of high-energy and ultrashort pulses is usually limited by the available gain bandwidth of ultrashort amplifiers. For the range of parameters usually available from state of the art FCPA, nonlinear compression is either performed in a silica solid-core fiber with energy limited by the self-focusing threshold (up to the μJ level [4,5,6]) or in gas-filled hollow core capillaries for higher input energy (from 200 μJ up to several mJ [7,8,9]), following a technique routinely used for Titanium-doped Sapphire (Ti:Sa) CPA systems [10] In the latter case, the low output energy (10< E < 500 μJ) and the long pulse length (typically from 300 fs up to 1ps) of FCPAs compared to bulk Ti:Sa systems necessitates longer interaction lengths, higher gas pressures, and lower diameters. The air-filled configuration allows a simple, compact and robust setup
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