Efficient High-Power Ultrashort Pulse Compression in Self-Defocusing Bulk Media

Author
Seidel, Marcus
Brons, Jonathan
Arisholm, Gunnar
Fritsch, Kilian
Pervak, Vladimir
Pronin, Oleg
Date Issued
2017
Permalink
http://hdl.handle.net/20.500.12242/642
https://publications.ffi.no/123456789/642
DOI
10.1038/s41598-017-01504-x
Collection
Articles
Description
Seidel, Marcus; Brons, Jonathan; Arisholm, Gunnar; Fritsch, Kilian; Pervak, Vladimir; Pronin, Oleg. Efficient High-Power Ultrashort Pulse Compression in Self-Defocusing Bulk Media. Scientific Reports 2017 ;Volum 7.(1)
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Abstract
Peak and average power scalability is the key feature of advancing femtosecond laser technology. Today, near-infrared light sources are capable of providing hundreds of Watts of average power. These sources, however, scarcely deliver pulses shorter than 100fs which are, for instance, highly beneficial for frequency conversion to the extreme ultraviolet or to the mid- infrared. Therefore, the development of power scalable pulse compression schemes is still an ongoing quest. This article presents the compression of 90W average power, 190fs pulses to 70W, 30fs. An increase in peak power from 18MW to 60MW is achieved. The compression scheme is based on cascaded phase-mismatched quadratic nonlinearities in BBO crystals. In addition to the experimental results, simulations are presented which compare spatially resolved spectra of pulses spectrally broadened in self-focusing and self-defocusing media, respectively. It is demonstrated that balancing self- defocusing and Gaussian beam convergence results in an efficient, power-scalable spectral broadening mechanism in bulk material.
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