Coherent combination of ultrashort pulses at low repetition rate

Synchronization of common-seed ultrashort pulses from parallel chirped pulse amplification (CPA) and compression systems, with accuracy comparable with the pulse duration, is hindered by the inherent environmental noise present in the laboratory.If the pulses are produced in high repetition rate systems, they can be monitored in real time and their relative delay fluctuations can be efficiently suppressed.However, at lower repetition rates, the laser pulses themselves do not provide the information about the delay for compensation at the required pace.It is demonstrated here the coherent combination of two ultrashort pulses from a dual arm CPA laser system and dual optical compressors at low repetition rate, using an assisting continuous wave laser beam.In this way, the relative delay fluctuations in the common focus of the two pulses reached 325 as rms, corresponding to /8, over 45 minutes of operation at 10 Hz, while their short term measured stability was 78 as rms, corresponding to /34, over 100 s.

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Publication Details

Journal
High Power Laser Science and Engineering
Published
2026-04-21
DOI
https://doi.org/10.1017/hpl.2026.10145
Primary Topic
Laser-Matter Interactions and Applications
Type
article
Field-Weighted Citation Impact
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article

Coherent combination of ultrashort pulses at low repetition rate

Lidia Văsescu, Andrei Nazîru, Vojtěch Horný, C. Derycke et al.
High Power Laser Science and Engineering
Laser-Matter Interactions and Applications
article

Coherent combination of ultrashort pulses at low repetition rate

Lidia Văsescu, Andrei Nazîru, Vojtěch Horný, C. Derycke, M. Gugiu, Bianca Stan, Dan Matei, D. Ursescu, Alice Dumitru, Olivier Chalus, Ioan Dăncuş, Andrei Gradinariu, Sergiu Rusnac, Razvan Dabu, Daniel Cracana, Andrew Okukura, Stefan Popa, Vlad Andrei Popescu
article en

Abstract

Synchronization of common-seed ultrashort pulses from parallel chirped pulse amplification (CPA) and compression systems, with accuracy comparable with the pulse duration, is hindered by the inherent environmental noise present in the laboratory.If the pulses are produced in high repetition rate systems, they can be monitored in real time and their relative delay fluctuations can be efficiently suppressed.However, at lower repetition rates, the laser pulses themselves do not provide the information about the delay for compensation at the required pace.It is demonstrated here the coherent combination of two ultrashort pulses from a dual arm CPA laser system and dual optical compressors at low repetition rate, using an assisting continuous wave laser beam.In this way, the relative delay fluctuations in the common focus of the two pulses reached 325 as rms, corresponding to /8, over 45 minutes of operation at 10 Hz, while their short term measured stability was 78 as rms, corresponding to /34, over 100 s.

High Power Laser Science and Engineering
University of Science and Technology (YE), Thales (Portugal) (PT), University of Bucharest (RO), Thales (Australia) (AU), National Institute for Laser Plasma and Radiation Physics (RO), Thales (France) (FR), Extreme Light Infrastructure - Nuclear Physics (RO), Universitatea Națională de Știință și Tehnologie Politehnica București (RO)
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