Generation of vortex beams from lasers with controlled Hermite- And Ince-Gaussian modes

Takayuki Ohtomo, Shu-Chun Chu, Kenju Otsuka

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We report selective excitations of higher-order Hermite-Gaussian and Ince-Gaussian (IG) modes in a laser-diode-pumped microchip solid-state laser and controlled generation of corresponding higher-order and multiple optical vortex beams of different shapes using an astigmatic mode converter (AMC). Simply changing the pump-beam diameter, shape, and lateral off-axis position of the tight pump beam focus on the laser crystal within a microchip semispherical cavity can produce the desired optical vortex beams in a well controlled manner. Pattern changes featuring different IG and HG modes obtained by rotating the AMC are also demonstrated. Numerical simulation shows that the vortex structure is changed by controlled off-axis laser diode pumping, which could lead toward precise optical manipulation of small particles.

Original languageEnglish
Pages (from-to)5082-5094
Number of pages13
JournalOptics Express
Volume16
Issue number7
DOIs
Publication statusPublished - 2008 Mar 31

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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