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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 14 — May. 10, 2008
  • pp: 2583–2591

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

Shu-Chun Chu, Takayuki Ohtomo, and Kenju Otsuka  »View Author Affiliations


Applied Optics, Vol. 47, Issue 14, pp. 2583-2591 (2008)
http://dx.doi.org/10.1364/AO.47.002583


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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.

© 2008 Optical Society of America

OCIS Codes
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3580) Lasers and laser optics : Lasers, solid-state

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: February 7, 2008
Manuscript Accepted: April 4, 2008
Published: May 2, 2008

Citation
Shu-Chun Chu, Takayuki Ohtomo, and Kenju Otsuka, "Generation of doughnutlike vortex beam with tunable orbital angular momentum from lasers with controlled Hermite-Gaussian modes," Appl. Opt. 47, 2583-2591 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-14-2583

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