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A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler
- Source :
- Nanophotonics, Vol 9, Iss 4, Pp 973-981 (2020)
- Publication Year :
- 2020
- Publisher :
- De Gruyter, 2020.
-
Abstract
- Using an all-fiber mode selective coupler (MSC) at the visible band, here we experimentally demonstrate a generating and wavelength multiplexing scheme for the cylindrical vector (CV) and vortex beams (VBs). The proposed MSCs act as efficient mode converters to produce spectrally insensitive high-order modes (HOMs) at the wavelength ranging from 450 to 980 nm, which have broad operation bandwidth (more than 7 nm), high mode conversion efficiency (94%), and purity (98%), and low insert loss (below 0.5 dB). By adjusting the polarization state and the phase shift of linear polarization (LP)11 mode respectively, the donut-shaped CVs and circular-polarization VBs are achieved. The focused intensity distribution of the donut beam on the cross- and axial-sections is monitored by using a confocal system. The all-fiber solution of producing and multiplexing HOMs opens a new route for stimulated emission depletion microscopy applications.
- Subjects :
- mode selective coupler (msc)
wavelength multiplexer
confocal
Physics
QC1-999
Subjects
Details
- Language :
- English
- ISSN :
- 21928614
- Volume :
- 9
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- Nanophotonics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.7dfc9aaee0784ff686cecda0c0ebc622
- Document Type :
- article
- Full Text :
- https://doi.org/10.1515/nanoph-2020-0050