Fiber mode converters: point-by-point fabrication of index gratings, visualization using thermoluminescence, and applications

A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler

Nanophotonics ◽

10.1515/nanoph-2020-0050 ◽

2020 ◽

Vol 9 (4) ◽

pp. 973-981 ◽

Cited By ~ 1

Author(s):

Han Yao ◽

Fan Shi ◽

Zhaoyang Wu ◽

Xinzhu Xu ◽

Teng Wang ◽

...

Keyword(s):

Phase Shift ◽

Intensity Distribution ◽

Linear Polarization ◽

Mode Conversion ◽

Polarization State ◽

Stimulated Emission ◽

Wavelength Multiplexing ◽

Mode Converters ◽

Fiber Mode ◽

Vortex Beams

AbstractUsing 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.

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Wavelength-independent all-fiber mode converters

Optics Letters ◽

10.1364/ol.32.000328 ◽

2007 ◽

Vol 32 (4) ◽

pp. 328 ◽

Cited By ~ 70

Author(s):

K. Lai ◽

S. G. Leon-Saval ◽

A. Witkowska ◽

W. J. Wadsworth ◽

T. A. Birks

Keyword(s):

Mode Converters ◽

Fiber Mode

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Linear-cavity cylindrical vector lasers based on all-fiber mode converters

Optics Communications ◽

10.1016/j.optcom.2018.06.064 ◽

2018 ◽

Vol 427 ◽

pp. 306-310 ◽

Cited By ~ 2

Author(s):

Xiaoqi Cui ◽

Zhiwen He ◽

Wending Zhang ◽

Mingkun Li ◽

Hua Lu ◽

...

Keyword(s):

Linear Cavity ◽

Mode Converters ◽

Fiber Mode

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In-Fiber Mode Conversion from LP11 to LP21 Based on Grating-Assisted Phase Matching with Polarization Control

2020 IEEE Photonics Conference (IPC) ◽

10.1109/ipc47351.2020.9252339 ◽

2020 ◽

Author(s):

Hajime Sakata ◽

Wataru Onishi

Keyword(s):

Mode Conversion ◽

Phase Matching ◽

Polarization Control ◽

Fiber Mode

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Design of large mode area all-solid anti-resonant fiber for high-power lasers

High Power Laser Science and Engineering ◽

10.1017/hpl.2021.7 ◽

2021 ◽

Vol 9 ◽

Author(s):

Xin Zhang ◽

Shoufei Gao ◽

Yingying Wang ◽

Wei Ding ◽

Pu Wang

Keyword(s):

High Power ◽

Single Mode ◽

Higher Order ◽

Coupling Scheme ◽

Resonant Coupling ◽

Higher Order Modes ◽

Mode Loss ◽

Fiber Mode ◽

Power Needs ◽

Mode Area

Abstract High-power fiber lasers have experienced a dramatic development over the last decade. Further increasing the output power needs an upscaling of the fiber mode area, while maintaining a single-mode output. Here, we propose an all-solid anti-resonant fiber (ARF) structure, which ensures single-mode operation in broadband by resonantly coupling higher-order modes into the cladding. A series of fibers with core sizes ranging from 40 to 100 μm are proposed exhibiting maximum mode area exceeding 5000 μm2. Numerical simulations show this resonant coupling scheme provides a higher-order mode (mainly TE01, TM01, and HE21) suppression ratio of more than 20 dB, while keeping the fundamental mode loss lower than 1 dB/m. The proposed structure also exhibits high tolerance for core index depression.

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