Generation of doughnutlike vortex beam with tunable orbital angular momentum from lasers with controlled Hermite-Gaussian modes

Shu-Chun Chu, Takayuki Ohtomo, Kenju Otsuka

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

This study demonstrates successive higher-order Hermite-Gaussian (HG 0,m) mode operations in a microchip solid-state laser with a controlled off-axis laser diode (LD) pumping and generation of the corresponding doughnutlike laser beam of tunable ring diameter and orbital angular momentum, by experimentally focusing a Hermite-Gaussian mode (HGM) lasing beam into an astigmatic mode converter (AMC) with a mode-matching lens. Based on the successful generation of stable doughnutlike vortex beams by combining the LD off-axis pumping of microchip lasers and an AMC, this study proposes a design for a compact, solid doughnutlike vortex laser beam generator that combines three elements (i.e., laser cavity, mode-matching lens, and AMC) into one practical device. The desired doughnutlike vortex beam with different orbital angular momentum is easily generated by simply controlling the lateral off-axis pump position and pump beam shape on the laser crystal by numerical simulation.

Original languageEnglish
Pages (from-to)2583-2591
Number of pages9
JournalApplied Optics
Volume47
Issue number14
DOIs
Publication statusPublished - 2008 May 10

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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