Femtosecond fiber CPA system emitting 830 W average output power

Abstract

In this Letter we report on the generation of 830 W compressed average power from a femtosecond fiber chirped pulse amplification (CPA) system. In the high-power operation we achieved a compressor throughput of about 90% by using high-efficiency dielectric gratings. The output pulse duration of 640 fs at 78 MHz repetition rate results in a peak power of 12 MW. Additionally, we discuss further a scaling potential toward and beyond the kilowatt level by overcoming the current scaling limitations imposed by the transversal spatial hole burning.

Exploring new avenues in high repetition rate table-top coherent extreme ultraviolet sources

“…Moreover, this experimental demonstration paves the way for making HHG sources more compact, cost-effective, reliable, and accessible to non-laser experts (e.g., by replacing our front-end (CC-FCPA) with a compact turn-key fiber laser system 33,34 or a thin-disk oscillator 35,36 ). Future work will aim to combine stateof-the-art kilowatt class femtosecond lasers 15 with the presented compression scheme to achieve milliwatt-level harmonics. The realization of phase-matched HHG with an even tighter focus and the use of a carrier envelope phase and repetition rate stabilized driver will provide a source with a high photon flux (,100 mW per harmonic) with repetition rates of 40 MHz or more that could then be used for frequency metrology in the XUV.…”

“…However, novel laser concepts, such as thin-disk 12,13 , innoslab 14 , and fiber lasers 15 , have shown impressive advances in their performance and reached the kilowatt level of average power during pulsed operation. All of these architectures are based on ytterbium-doped laser materials that limit the attainable pulse duration to a few hundred femtoseconds.…”

A concept for multiterawatt fibre lasers based on coherent pulse stacking in passive cavities

“…In particular, fibre-based amplifiers are well known for their outstanding beam quality, high efficiency and high average powers even in the femtosecond-pulse regime. 11 However, fibres face serious challenges when to be pushed to high peak powers. The tight transverse confinement of the optical pulses over considerable lengths typically enforces nonlinear pulse distortions and damage.…”

Femtosecond fiber CPA system in a single pass configuration

“…Most of the setups reported so far utilize two or more amplification stages [5][6][7] to obtain tens of J energy levels with a reduced (<1 MHz) repetition rate. Other works explore the limits of the highest possible pulse energy or average power [3,8] at the expense of significant complication of the amplifier set-ups.Here we describe a simplified system where femtosecond pulses from a low average power modelocked oscillator are amplified in a single pass configuration in a Yb-doped single mode large mode area (LMA) fiber, reaching 50J at 200kHz. To reduce nonlinear effects, the CPA technique is used, but with moderate-size optical elements and thus a modest pulse stretching ratio.…”

“…Most of the setups reported so far utilize two or more amplification stages [5][6][7] to obtain tens of J energy levels with a reduced (<1 MHz) repetition rate. Other works explore the limits of the highest possible pulse energy or average power [3,8] at the expense of significant complication of the amplifier set-ups.…”