Journal
PHYSICAL REVIEW RESEARCH
Volume 2, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.2.033482
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Funding
- National Natural Science Foundation of China [11874019, 11747041, 11674257]
- Natural Science Foundation of Guangdong Province [2019A1515011172]
- Natural Science Foundation of Hubei Province [2017CFB150]
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The characteristics of the photon channels in the collinear two-color high-order harmonic generation (HHG) are investigated with the vortices. It is found that the yields of the photon channels sensitively depend on ratio of the intensities I-2 omega/I-omega. This sensitive dependence exhibits unique characteristics such as the suppression of the n-omega fundamental channel and the photon localization in the high-order channel. Therefore, one can adjust I-2 omega/I-omega to select one dominant channel to generate and tune the harmonic vortices with well-defined orbital angular momentum (OAM). Our findings provide an effective way to generate extreme ultraviolet vortices or helical attosecond pulses with well-defined and controllable OAM.
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