A delay-programmable two-color femtosecond source for multiphoton ionization studies based on chirped-seed NOPA
Atomic Physics
2026-05-05 v1 Optics
Quantum Physics
Abstract
We demonstrate a delay-programmable two-color femtosecond source based on a chirped-seed noncollinear optical parametric amplifier. Introducing controlled dispersion into the seed enables spectral selection through pump-seed delay, allowing flexible generation of two independently tunable pulse components with adjustable relative timing at high repetition rate. The temporal and spectral properties are characterized using nonlinear optical cross-correlation and dispersion-scan measurements. As a benchmark application, the source is employed in a COLTRIMS-based multiphoton ionization experiment on trapped Li atoms, revealing delay-dependent ionization pathways and demonstrating its suitability for bichromatic ultrafast spectroscopy.
Keywords
Cite
@article{arxiv.2605.02749,
title = {A delay-programmable two-color femtosecond source for multiphoton ionization studies based on chirped-seed NOPA},
author = {Kyle Foster and Shruti Majumdar and Mason Toombs and Harshit Agarwal and Daniel Fischer},
journal= {arXiv preprint arXiv:2605.02749},
year = {2026}
}