A filter lens for optical compensation in transmission spectrum

Yu-Hsuan Lin; Hsin-Yi Tsai; Han-Chao Chang; Chun-Jen Weng; Kuo-Cheng Huang

doi:10.1117/12.2019725

22 June 2013 A filter lens for optical compensation in transmission spectrum

Yu-Hsuan Lin, Hsin-Yi Tsai, Han-Chao Chang, Chun-Jen Weng, Kuo-Cheng Huang

Proceedings Volume 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013); 87692U (2013) https://doi.org/10.1117/12.2019725
Event: International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 2013, Singapore, Singapore

Abstract

The absorbing filter [1] is an optical element employed for isolating regions of a spectrum. In general, the thicker the absorbing filter material, the more wavelengths it will absorb. However, most optical filter products ignore light diffusion and are made with a constant thickness. While the non-collimated beams pass through the filter, the optical paths vary with incident angles. Thus, the absorption difference happens and leads to the poor uniformity of transmission spectrum. In our work, a filter lens was developed to achieve the similar function of interference filter and ND filter with better spectrum uniformity. It is mounted onto a designed macro lens and supplies it with a good spectrum aberration correction. The shape of the filter lens is designed to eliminate the optical path differences between the light beams in the medium. The macro lens is made of neutral glass and shaped into symmetrical biconvex for achieving macro imaging. The spectrum characteristic of the filter lens depends on the material of the absorbing filter. In the experiment, the filter lens was prepared. The experimental results show that the spectrum uniformity of the filter lens is better than that of the normal filter.

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Yu-Hsuan Lin, Hsin-Yi Tsai, Han-Chao Chang, Chun-Jen Weng, and Kuo-Cheng Huang "A filter lens for optical compensation in transmission spectrum", Proc. SPIE 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 87692U (22 June 2013); https://doi.org/10.1117/12.2019725

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KEYWORDS

Optical filters

Lens design

Glasses

Aberration correction

Absorption

Optical components

Bandpass filters

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