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:doi:10.3788/COL201917.120602

Chinese Optics Letters, 2019, 17 (12): 120602, Published Online: Nov. 27, 2019

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

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

Author Affiliations

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

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

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

Figures & Tables

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.

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

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

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

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

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.

Fig. 6. Schematic of the measurement system.

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

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

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

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

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.

Fig. 6. Schematic of the measurement system.

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