1. A spectrally bright wavelength-switchable vacuum ultraviolet source driven by quantum coherence in strong-field-ionized molecules
- Author
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Yuexin Wan, Zhaoxiang Liu, Jinping Yao, Bo Xu, Jinming Chen, Fangbo Zhang, Zhihao Zhang, Lingling Qiao, and Ya Cheng
- Subjects
vacuum ultraviolet ,deep ultraviolet ,quantum coherence ,Raman comb ,Science ,Physics ,QC1-999 - Abstract
We report generation of spectrally bright vacuum ultraviolet (VUV) and deep UV (DUV) coherent radiations at the wavelengths of 192 nm, 198 nm and 204 nm. These DUV/VUV radiations originate from resonant four-wave mixing assisted by quantum coherence in tunnel-ionized CO molecules. The electronic coherence is created when the pump pulses resonantly excite electronic transitions of CO ^+ . The technique allows for the selective switch of DUV/VUV wavelengths provided by the abundant energy levels of molecular ions. The developed source can have arbitrary polarization states by manipulating the polarization of the pump pulse. It also exhibits a spectral bandwidth of 5∼7 cm ^−1 , a divergence angle of 3∼5 mrad, a pulse duration of ∼10 ps, and a photon flux of ∼10 ^10 photons/s. The superior temporal and spectral properties give rise to a broadband Raman comb in the DUV/VUV region.
- Published
- 2021
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