Abstract
A high-speed, high-resolution swept-source optical coherence tomography (SS-OCT) is presented for focusing lens imaging and a k-domain uniform algorithm is adopted to find the wave number phase equalization. The radius of curvature of the laser focusing lens was obtained using a curve-fitting algorithm. The experimental results demonstrate that the measuring accuracy of the proposed SS-OCT system is higher than the laser confocal microscope. The SS-OCT system has great potential for surface topography measurement and defect inspection of the focusing lens.
Highlights
The radius of curvature (ROC) is a key parameter for focusing a lens
The imaging experiment was performed on a laser focusing lens used in the laser projector to measure the ROC of the focusing lens
We introduced a swept-source optical coherence tomography (SS-Optical coherence tomography (OCT)) system to measure the ROC of a focusing lens
Summary
The radius of curvature (ROC) is a key parameter for focusing a lens. The measuring accuracy of the ROC is essential for the focusing intensity of the laser beam. OCT has been widely used in ophthalmic imaging, medical endoscopy, cell and material detection [8,9,10,11,12,13,14] It can provide the cross-sectional images of samples in vivo with micron scale resolution. SS-OCT is a nondestructive detection method which is suitable for measurement the ROC of optical element with high accuracy, which can get the 1D depth image and the 2D cross-sectional image simultaneously. The SS-OCT system was set up to measure the ROC of focusing lens, which can perfectly avoid the limitations of traditional measurement methods. It can get the real-time images of the contour of the ROC
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