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The researchers combined fiber laser systems with the latest advances in multi-channel units to create a unique combination of low-period pulses with high average power, pulse energy, and repetition rate, as well as stable carrier envelope phase (CEP) operating lasers. These characteristics make the new laser an ideal choice for driving next-generation attosecond light sources, such as the European Aurora Infrastructure (ELI) light source.
ELI is the world's largest and most advanced high-power laser infrastructure, which will be used to study light-matter interactions at the highest intensity and shortest time scale. The beam line of ELI's attosecond light pulse source will provide unprecedented performance in generating isolated attosecond pulses, so the requirements on the laser system are very demanding.
Steffen Hädrich of Active Fiber Systems GmbH in Germany will demonstrate the new laser at the Optica (formerly OSA) Laser Conference virtual web conference from October 3 to 7, 2021. Hädrich's speech is scheduled for Monday, October 4th at 11:30 (UTC 04: 00) Eastern Time.
"The development of this unique laser system opens up new prospects for secondary light sources, such as generating isolated attosecond pulses with unprecedented parameters," Hädrich said. These, in turn, are expected to promote the understanding of electronic processes on basic length and time scales, and contribute to new discoveries in the fields of biology, chemistry, physics, and medicine. "
To create a laser system that can meet the needs of ELI and other scientific applications, the researchers developed a fiber chirped pulse amplification system that coherently combines eight amplifier channels. The system sends out a 300-fs pulse, and then uses two multi-channel units to compress it to a few cycles. The first multi-channel unit uses a standard dielectric mirror to achieve a 1.7 mJ pulse with a duration of less than 35 fs. The second battery uses a metal-based mirror to achieve a pulse duration of only 5.8 fs with a pulse energy of 1.1 mJ, an average power of 110 W, and a repetition rate of 100 kHz.
Stable CEP operation is needed to take full advantage of the high average power and fast repetition rate of the laser. The researchers achieved this by measuring the CEP of each pulse using a single stereo ATI phase meter, which can characterize noise across the entire spectrum. The CEP measurement is sent to the PID controller, creating a feedback loop that enables ~400 mrad of CEP noise.
"We showed the shortest pulse and the highest compressed average power that has been achieved with a few-period MPC of 110 W at a pulse repetition rate of 100 kHz," Hädrich said. "With further improvements, we hope to achieve CEP noise below 300 mrad soon."
Hädrich added: "The proposed laser system meets the requirements of ELI-ALPS's HR1 laser. We are extending this method to HR2 parameters by implementing this concept to demonstrate a 500W, 5mJ, 6fs CEP-stable laser system. "Further explore the short-period pulse to break through the 300 W barrier. A citation provided by the Optical Association: The new laser meets the demanding requirements of driving cutting-edge attosecond light sources (2021, October 1st). Retrieved on November 26, 2021 from https://phys. org/ news/2021-10-laser-demanding-requirements-cutting-edge-attosecond.html This document is protected by copyright. Except for any fair transaction for private learning or research purposes, no part may be copied without written permission. The content is for reference only.
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