Extended sub-surface imaging in industrial OCT using ‘non-diffracting’ Bessel beams
Haydn Martin, Prashant Kumar, Andrew Henning, Xiangqian Jiang
Abstract
Optical coherence tomography (OCT) is an imaging technique which can provide sub-surface evaluation of defects in optically compliant components such as those manufactured by polymeric selective laser sintering. In OCT systems, achieving lateral imaging resolutions of <10 µm means that full-depth imaging requires multiple scans due to the limited depth of focus (DOF). We present a study on the application of ‘non-diffracting’ Bessel beams to extend system DOF and enable deeper imaging with a single scan. Such capability expands the potential for OCT as a rapid tool for sub-surface assessment, either in-line or in-process, by greatly reducing acquisition times.
Topics & Concepts
Optical coherence tomographyOpticsBessel beamFocus (optics)Materials scienceBessel functionCoherence (philosophical gambling strategy)LaserSurface (topology)Computer sciencePhysicsGeometryMathematicsQuantum mechanicsOptical Coherence Tomography ApplicationsRetinal and Macular SurgeryLaser Material Processing Techniques