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Generation of vortex beams by an image-rotating optical parametric oscillator

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Abstract

We generate optical vortex beams in a nanosecond optical parametric oscillator based on an image-rotating resonator. This efficient new method of vortex generation should be adaptable to pulsed or continuous lasers.

©2003 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Nonplanar ring OPO cavity with 90° image rotation on each cavity pass.
Fig. 2.
Fig. 2. Far field signal fluence profile for on-axis seeding. The subscript ‖ denotes the direction parallel to birefringent walkoff in the KTP crystal, while ⊥ denotes the direction perpendicular to walkoff.
Fig. 3.
Fig. 3. Formation of a vortex beam from an off-axis seed beam when the cavity is tuned to a four-times-around longitudinal mode. The circles represent the seed beam after 0, 1, 2, and 3 passes around the cavity. The arrows represent the relative phases in each portion of the beam.
Fig. 4.
Fig. 4. Far field signal fluence profile for off-axis seeding with the cavity tuned to a four-times-around resonance.
Fig. 5.
Fig. 5. Interference pattern of OPO beam and spherical wave showing spiral phase with charge 1.

Equations (1)

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M = ( r s 2 r p 1 e i ϕ 1 0 0 r s 1 r p 2 e i ϕ 2 )
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