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Pillinen E, Koivurova M, Turunen J. Pulse shaping by spectral-domain polarization gratings. OPTICS LETTERS 2022; 47:2012-2015. [PMID: 35427324 DOI: 10.1364/ol.455928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 03/03/2022] [Indexed: 06/14/2023]
Abstract
We consider the spectral-domain counterparts of spatial-domain polarization gratings and study their effect on the temporal evolution of femtosecond-scale light pulses. These devices divide an incident light pulse to several orders via spectral polarization modulation, permitting pulse splitting and shaping with controlled time-domain polarization dynamics.
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Na KS, Lee CS, Kim DR, Song SH, Cho SY, Kim EC, Kim HS, Hwang HS. Development of a novel multifocal lens using a polarization directed flat lens: possible candidate for a multifocal intraocular lens. BMC Ophthalmol 2021; 21:444. [PMID: 34961511 PMCID: PMC8711202 DOI: 10.1186/s12886-021-02191-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 11/19/2021] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND A polarization-directed flat (PDF) lens acts as a converging lens with a focal length (f) > 0 and a diverging lens with f < 0, depending on the polarization state of the incidental light. To produce a multifocal lens with two focal lengths, a PDF and a converging lens having shorter focal length were combined. In this study, we tested a bifocal PDF to determine its potential as a new multifocal intraocular lens (IOL). METHODS Constructed a multifocal lens with a PDF lens (f = +/- 100 mm) and a converging lens (f = + 25 mm). In an optical bench test, we measured the defocus curve to test the multifocal function. The multifocal function and optical quality of the lens in various situations were tested. An Early Treatment Diabetic Retinopathy Study (ETDRS) chart as a near target and a building as a distant target were photographed using a digital single-lens reflex (DSLR) camera. Both lenses (multifocal and monofocal) were tested under the same conditions. RESULTS For the 0 D and - 20 D focal points, the multifocal lens showed sharp images in the optical bench test. In the DSLR test using the multifocal lens, the building appeared slightly blurry compared with the results using the monofocal lens. With the multifocal lens, the ETDRS chart's images became blurry as the ETDRS chart's distance decreased, but became very clear again at a certain position. CONCLUSIONS We confirmed the multifocal function of the multifocal lens using a PDF lens. This lens can be used as a multifocal IOL in the future.
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Affiliation(s)
- Kyung-Sun Na
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591 Republic of Korea
| | - Chang Su Lee
- Department of Electrical and Electronic Engineering, The University of Suwon, Hwaseong, South Korea
| | - Da Ran Kim
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591 Republic of Korea
| | - Seok Ho Song
- Department of Physics, Hanyang University, Seoul, South Korea
| | - Soo Yeon Cho
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591 Republic of Korea
| | - Eun Chul Kim
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591 Republic of Korea
| | - Hyun Seung Kim
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591 Republic of Korea
| | - Ho Sik Hwang
- Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 06591 Republic of Korea
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