Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO<sub>2</sub> laser

Xin Tian; Hao Li; Le Liu; Meng Wang; Xiaoming Xi; Zefeng Wang

doi:10.3788/COL201917.120602

Chinese Optics Letters, Volume. 17, Issue 12, 120602(2019)

Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO₂ laser

Xin Tian^1,2,3, Hao Li^1,2,3, Le Liu^1,2,3, Meng Wang^1,2,3, Xiaoming Xi^1,2,3, and Zefeng Wang^1,2,3、*

Author Affiliations

¹College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

²State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China

³Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China

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Figures & Tables(6)

$(a) Mode coupling scheme of an LPFG mode converter. (b) The density profile of the LP11 mode and four high-order vector beams (TE01, TM01, HE21,even, HE21,odd) at 1064 nm, and their x component of electric-field simulations with the standard step index fiber of SMF-28e (the core and cladding diameters are ∼8.2 μm and 125 μm, the refractive indices of the core and cladding are 1.4689 and 1.4630 at 1064 nm) by the finite element method.$

Fig. 1. (a) Mode coupling scheme of an LPFG mode converter. (b) The density profile of the ${LP}_{11}$ mode and four high-order vector beams ( ${TE}_{01}$ , ${TM}_{01}$ , ${HE}_{21, even}$ , ${HE}_{21, odd}$ ) at 1064 nm, and their $x$ component of electric-field simulations with the standard step index fiber of SMF-28e (the core and cladding diameters are ∼8.2 μm and 125 μm, the refractive indices of the core and cladding are 1.4689 and 1.4630 at 1064 nm) by the finite element method.

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Fig. 2. Fabrication setup: SC, supercontinuum light source; OSA, optical spectrum analyzer; PC, polarization controller.

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Fig. 3. Transmission spectrum of the FBG for experiments.

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Fig. 4. (a) Simulation PMC of the fiber of SMF-28e; (b) the measured transmission spectrum of the mode converter.

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Fig. 5. (a) Transmission spectrum of the LPFG with different grating periods. (b) The mode profile of the LPFG with different periods. (c) The beam profile when the output passes a linear polarizer with different orientations.

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Fig. 6. Schematic of the measurement system.

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Xin Tian, Hao Li, Le Liu, Meng Wang, Xiaoming Xi, Zefeng Wang. Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO₂ laser[J]. Chinese Optics Letters, 2019, 17(12): 120602

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Paper Information

Category: Fiber Optics and Optical Communications

Received: May. 17, 2019

Accepted: Aug. 22, 2019

Published Online: Nov. 27, 2019

The Author Email: Zefeng Wang (zefengwang_nudt@163.com)

DOI:10.3788/COL201917.120602

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology