Multi-pulse accumulation of gas molecular coherence enables gigahertz ultrafast frequency conversion
Abstract
Frequency conversion of ultrafast lasers is fundamentally constrained by the trade-off between pulse energy and repetition rate. Here, we demonstrate a frequency conversion mechanism in which molecular coherence accumulates across ultrafast pulse trains in gas-filled hollow-core fibers. Unlike conventional nonlinear interactions initiated by individual high-energy pulses, this mechanism relies on the collective buildup of coherent molecular oscillations driven by successive pulses. Using this approach, we achieve Raman frequency conversion at repetition rates up to 3 GHz with nanojoule pulse energies. The results demonstrate that accumulated molecular coherence can govern nonlinear frequency conversion, revealing a domain of light-matter interaction whose physical limits remain largely unexplored.
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BibTeX
@misc{wang2026multipulse,
title = {{Multi-pulse accumulation of gas molecular coherence enables gigahertz ultrafast frequency conversion}},
author = {Yazhou Wang and Marcello Meneghetti and Ian Davidson and Timothy Bate and J. E. Antonio-Lopez and Qiang Fu and Jaroslaw Rzegocki and Gregory T. Jasion and Rodrigo Amezcua-Correa and Francesco Poletti and Christos Markos},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.11811},
eprint = {2606.11811},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.11811},
}
RIS
TY - UNPB
TI - Multi-pulse accumulation of gas molecular coherence enables gigahertz ultrafast frequency conversion
AU - Yazhou Wang
AU - Marcello Meneghetti
AU - Ian Davidson
AU - Timothy Bate
AU - J. E. Antonio-Lopez
AU - Qiang Fu
AU - Jaroslaw Rzegocki
AU - Gregory T. Jasion
AU - Rodrigo Amezcua-Correa
AU - Francesco Poletti
AU - Christos Markos
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2606.11811
UR - https://arxiv.org/abs/2606.11811
AB - Frequency conversion of ultrafast lasers is fundamentally constrained by the trade-off between pulse energy and repetition rate. Here, we demonstrate a frequency conversion mechanism in which molecular coherence accumulates across ultrafast pulse trains in gas-filled hollow-core fibers. Unlike conventional nonlinear interactions initiated by individual high-energy pulses, this mechanism relies on the collective buildup of coherent molecular oscillations driven by successive pulses. Using this approach, we achieve Raman frequency conversion at repetition rates up to 3 GHz with nanojoule pulse energies. The results demonstrate that accumulated molecular coherence can govern nonlinear frequency conversion, revealing a domain of light-matter interaction whose physical limits remain largely unexplored.
ER -