Realizing High-Pulse-Energy Large-Angular-Momentum Beams by Astigmatic Transformation of Geometric Modes in an Nd:YAG/Cr4+:YAG Laser

Pi Hui Tuan, Hsin Chih Liang, Kai-Feng Huang, Yung-Fu Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

An off-axis pumped Nd:YAG/Cr 4+ :YAG laser under different degenerate cavity conditions has been thoroughly studied to generate high-pulse-energy geometric modes for further beam transformation. Because of the employment of Nd:YAG gain crystal provides a flexible choice of cavity length to achieve efficient passively Q-switched (PQS) operation, various PQS geometric modes with stable spatial structures are generated. Moreover, it is experimentally confirmed that the output energy and peak power of the PQS geometric modes can easily reach up to over 100 μJ and 10 kW with fairly stable pulse trains in pure linear polarization. By using an astigmatic mode converter (AMC) to transform the planar geometric modes into the circular geometric modes, various high-energy vortex beams with large angular momentum and diverse phase structures are successfully realized to offer a promising light source for further application. The propagation evolution of the transformed geometric modes through the AMC was also analyzed theoretically to offer useful insights for the formation of the geometric vortex beams.

Original languageEnglish
Article number1600809
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume24
Issue number5
DOIs
StatePublished - 1 Sep 2018

Keywords

  • beam transformation
  • diode pumping
  • Optical vortices
  • Q-switching

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