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

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

doi:10.3788/COL201917.120602

Journals >Chinese Optics Letters >Volume 17 >Issue 12 >Page 120602 > Article

Chinese Optics Letters
Vol. 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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DOI: 10.3788/COL201917.120602 Cite this Article Set citation alerts

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 Copy Citation Text

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

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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