An optical system adopting liquid crystals with electrical tunability of wavelength and energy density for low level light therapy

Chia-Ming Chang; Yu-Jen Wang; Hung-Shan Chen; Yi-Hsin Lin; Abhishek Kumar Srivastava; Vladimir Grigorievich Chigrinov

doi:10.1117/12.2188889

5 September 2015 An optical system adopting liquid crystals with electrical tunability of wavelength and energy density for low level light therapy

Chia-Ming Chang, Yu-Jen Wang, Hung-Shan Chen, Yi-Hsin Lin, Abhishek Kumar Srivastava, Vladimir Grigorievich Chigrinov

Author Affiliations +

Proceedings Volume 9565, Liquid Crystals XIX; 95650K (2015) https://doi.org/10.1117/12.2188889
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States

Abstract

We have developed a bistable negative lens by integrating a polarization switch of ferroelectric liquid crystals (FLCs) with a passively anisotropic focusing element. The proposed lens not only exhibits electrically tunable bistability but also fast response time of sub-milliseconds, which leads to good candidate of optical component in optical system for medical applications. In this paper, we demonstrate an optical system consisting of two FLC phase retarders and one LC lenses that exhibits both of electrically tunable wavelength and size of exposure area. The operating principles and the experimental results are discussed. The tunable spectrum, exposure area size and tunable irradiance are illustrated. Compared to conventional lenses with mechanical movements in the medical light therapy system, our electrically switchable optical system is more practical in the portable applications of light therapy (LLLT).

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Chia-Ming Chang, Yu-Jen Wang, Hung-Shan Chen, Yi-Hsin Lin, Abhishek Kumar Srivastava, and Vladimir Grigorievich Chigrinov "An optical system adopting liquid crystals with electrical tunability of wavelength and energy density for low level light therapy", Proc. SPIE 9565, Liquid Crystals XIX, 95650K (5 September 2015); https://doi.org/10.1117/12.2188889

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