Generating Elliptical Zero-Order Bessel Beams with a Tilted Diffraction Grating

• Main Authors: Ramos, Paz Victoria T, Guerrero, Raphael A
• Format: text
• Published: Archīum Ateneo 2021
• Subjects: Bessel beams; diffraction grating; Physics; Plasma and Beam Physics
• Online Access: https://archium.ateneo.edu/physics-faculty-pubs/85; https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11898/1189826/Generating-elliptical-zero-order-Bessel-beams-with-a-tilted-diffraction/10.1117/12.2602714.short?SSO=1
• Institution: Ateneo De Manila University

Our current work discusses an alternative cost-effective method for producing elliptical zero-order Bessel beams with a simple optical system based on a commercially available transmission grating. A zero-order Bessel beam is made to pass through a diffraction grating with a groove density of 600 lines per mm. An elliptical Bessel beam intensity profile is obtained with the 1st-order (m = 1) diffracted beam when the grating is rotated about an axis parallel to the grating vector. For a grating tilted by 20 deg from the vertical, non-diffraction of the elliptical Bessel beam is observed over a propagation range from 10 to 95 cm with an average core diameter of 404 um. The elliptical Bessel beam at m = 1 has an eccentricity of 0.6 for a grating tilt of 20 deg.