Photopolymer-based coaxial holographic lens for spectral confocal displacement and morphology measurement
- 12 July 2019
- journal article
- research article
- Published by Optica Publishing Group in Optics Letters
- Vol. 44 (14), 3554-3557
- https://doi.org/10.1364/ol.44.003554
Abstract
A spectral confocal displacement and morphology measurement device with a photopolymer-based coaxial holographic lens as a high dispersion element is developed. The linear dependence of the axial spatial position on the peak wavelength of dispersion spectrum provides a high accuracy and large range for measuring displacement and morphology. In the linear dispersion region, accompanied with a 120 nm shift of peak wavelength, the measure position range exceeds 20 mm. The available experimental accuracy of displacement and morphology can reach 47.5 μm/0.5 nm using a commercial optical fiber spectrum with a resolution of 0.5 nm. Utilizing thin polymer-based holographic lens with high dispersion can effectively compact the device size. Simultaneously, it can provide a large axial dispersion for measuring the spatial position characterization compared with the traditional glass-based dispersion lens group. A holographic optical lens based on a photopolymer is expected to apply in high-precision surface morphology measurement of large-scale macroscopic objects. It will improve the measurement accuracy and accelerate the development of holographic optical elements.Keywords
Funding Information
- National Natural Science Foundation of China (NSFC) (61307007, 61505252)
- Civil Aviation University of China (3122017074)
- Tianjin Municipal Education Commission (2017KJ238)
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