A5028840274- Laser-Matter Interactions and Applications
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
National University of Defense Technology
2022-2024
Supercontinuum (SC) light sources hold versatile applications in many fields ranging from imaging microscopic structural dynamics to achieving frequency comb metrology. Although such broadband are readily accessible the visible and near infrared regime, ultraviolet (UV) extension of SC spectrum is still challenging. Here, we demonstrate that joint contribution strong field ionization quantum resonance leads unexpected UV continuum radiation spanning 100 nm bandwidth molecular nitrogen ions....
Tunneling ionization, a fascinating quantum phenomenon, has played the key role in development of attosecond physics. Upon absorption few tens photons, tunneling ionization creates ions different excited states and even enables formation population inversion between ionic states. However, underlying physics is still being debated. Here, we demonstrate significant enhancement efficiency multiphoton excitation when neutral molecules resonant coexist strong laser fields. It facilitates dramatic...
We report an unexpected experimental observation in rotation-resolved N2+ lasing that the R-branch intensity from a single rotational state vicinity of 391 nm can be greatly stronger than P-branch summing over total states at suitable pressures. According to combined measurement dependence on pump-probe delay and polarization, we speculate destructive interference induced for spectrally-indistinguishable due propagation effect while is little affected its discrete spectral property, after...
We study population distributions and lasing actions of N_2^+ driven by femtosecond lasers with various wavelengths, uncover an efficient ionic excitation mechanism induced synchronized ionization multiphoton resonance. Our results show that the strongest appears around 1000 nm pump wavelength. At optimal wavelength, pump-energy threshold for air generation is reduced five folds compared required previous 800 laser. Simulations based on ionization-coupling model indicate although...