Generation of vortex N2+ lasing

作者：Hu, Y. U. E.; Ye, Z. H. E. N. G. J. U. N.; LI, H. A. N. X. I. A. O.; Lu, C. H. E. N. X. U.; Chen, F. E., I; Wang, J. I. A. W. E. I.; Pan, S. H. E. N. G. Z. H. E.; Zhang, M. I. N.; Gao, J. I. A. N.; Wu, J. I. A. N.^*

来源：Optica, 2023, 10(6): 682-687.

DOI：10.1364/OPTICA.489206

• ORBITAL ANGULAR-MOMENTUM
• ATOMIC MEDIA
• LASER
• IONIZATION

Harnessing structured light is fascinating for its multidisciplinary applications, e.g., in remote driving microrobots, sensing, communications, and ultrahigh resolution imaging. Here, we experimentally demonstrated the generation of a vortex N-2(+) lasing pumped by a wavefront structured near-IR femtosecond pulse with orbital angular momentum. The topological charge of the N-2(+) lasing was measured to be twofold that of the pump beam. Compared to the case with a pump beam of a plane wavefront, the N-2(+) lasing generation efficiency is much higher for the vortex pump beam at high pumping energy, which has a higher clamping intensity by reducing the on-axis plasma density. Our results herald a march toward remote structured N-2(+) lasing.

• 单位
  中国科学院