Efficient high-harmonic generation from a stable and compact ultrafast Yb-fiber laser producing 100 μJ, 350 fs pulses based on bendable photonic crystal fiber

The development of an Yb 3+ -fiber-based chirped-pulse amplification system and the performance in the generation of extreme ultraviolet (EUV) radiation by high-harmonic generation is reported. The fiber laser produced 100 μJ, 350 fs output pulses with diffraction-limited beam quality at a repetitio...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2017, Vol.123 (1), p.43-12, Article 43
Main Authors: Feehan, James S., Price, Jonathan H. V., Butcher, Thomas J., Brocklesby, William S., Frey, Jeremy G., Richardson, David J.
Format: Article
Language:English
Subjects:
Amplifiers
Applied physics
Crystal fibers
Energy conversion efficiency
Engineering
Fiber lasers
Fiber technology
Harmonic generations
Infrared imaging
Lasers
Optical Devices
Optics
Photonic crystals
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Repetition
Ultraviolet radiation
Xenon
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Summary:The development of an Yb 3+ -fiber-based chirped-pulse amplification system and the performance in the generation of extreme ultraviolet (EUV) radiation by high-harmonic generation is reported. The fiber laser produced 100 μJ, 350 fs output pulses with diffraction-limited beam quality at a repetition rate of 16.7 kHz. The system used commercial single-mode, polarization maintaining fiber technology. This included a 40 μm core, easily packaged, bendable final amplifier fiber in order to enable a compact system, to reduce cost, and provide reliable and environmentally stable long-term performance. The system enabled the generation of 0.4 μW of EUV at wavelengths between 27 and 80 nm with a peak at ~45 nm using xenon gas. The EUV flux of ~10 11  photons per second for a driving field power of 1.67 W represents state-of-the-art generation efficiency for single-fiber amplifier CPA systems, corresponding to a maximum calculated energy conversion efficiency of 2.4 × 10 −7 from the infrared to the EUV. The potential for high average power operation at increased repetition rates and further suggested technical improvements are discussed. Future applications could include coherent diffractive imaging in the EUV, and high-harmonic spectroscopy.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-016-6620-8