Exploring transverse pattern formation in a dual-polarization self-mode-locked monolithic Yb: KGW laser and generating a 25-GHz sub-picosecond vortex beam via gain competition

M. T. Chang, H. C. Liang, Kuan-Wei Su, Yung-Fu Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Formation of transverse modes in a dual-polarization self-mode-locked monolithic Yb: KGW laser under high-power pumping is thoroughly explored. It is experimentally observed that the polarization-resolved transverse patterns are considerably affected by the pump location in the transverse plane of the gain medium. In contrast, the longitudinal self-mode-locking is nearly undisturbed by the pump position, even under the high-power pumping. Under central pumping, a vortex beam of the Laguerre-Gaussian LG p,l mode with p = 1 and l = 1 can be efficiently generated through the process of the gain competition with a sub-picosecond pulse train at 25.3 GHz and the output power can be up to 1.45 W at a pump power of 10.0 W. Under off-center pumping, the symmetry breaking causes the transverse patterns to be dominated by the high-order Hermite-Gaussian modes. Numerical analyses are further performed to manifest the symmetry breaking induced by the off-center pumping.

Original languageEnglish
Pages (from-to)8754-8762
Number of pages9
JournalOptics Express
Volume24
Issue number8
DOIs
StatePublished - 18 Apr 2016

Keywords

  • SINGLE-FREQUENCY
  • MICRO-LASER
  • YBKGW LASER
  • LOCKING
  • YAG
  • ND
  • COMPOSITE
  • OPERATION
  • CERAMICS

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