Thermal expanded core ultraviolet fiber for optical cavity mode matching

Xin-Xia Gao; Jin-Ming Cui; Yun-Feng Huang; Chuan-Feng Li; Guang-Can Guo

doi:doi:10.3788/COL201917.090601

Chinese Optics Letters, 2019, 17 (9): 090601, Published Online: Jul. 24, 2019

Thermal expanded core ultraviolet fiber for optical cavity mode matching Download： 870次

Xin-Xia Gao ^1,2Jin-Ming Cui ^1,2,*Yun-Feng Huang ^1,2Chuan-Feng Li ^1,2Guang-Can Guo ^1,2

Author Affiliations

¹ CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China

² CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

Figures & Tables

Fig. 1. Simulation of refractive index distribution versus radial distance from the fiber core with different thermal expanding times.

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Fig. 2. Diagram of fiber mode simulation by the finite element method. Fundamental mode with heating time at (a) $T = 0 \min,$ (b) $T = 5 \min,$ (c) $T = 15 \min,$ (d) $T = 40 \min,$ respectively. Comparing (d) to (a), the spot is increased by about seven times, and the Gaussian pattern shows that the fundamental mode propagating in the TEC fiber is maintained.

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Fig. 3. Setup diagram of fiber core expansion. An SMF is held on the fiber mount and heated by a hydrogen/oxygen flame, and the beam profiler is used to monitor the spot size to determine the divergence of the beam after the TEC fiber, which finally indicates the MFD of the TEC fiber. The magnified inset is a photo of the target fiber in a fiber fusion splicer. It is a combination of an SM300 fiber and 630-HP fiber, where the length of the 630-HP fiber is controlled within 1 mm, and the heating region is focused on the splicing.

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Fig. 4. Spot changes when heating the splicing between the SM300 fiber and 630-HP fiber. (a) The initial SM300 with half-divergence $θ = 0.116 rad$ ; (b)–(h) the spot change process; (i) the final Gaussian spot with half-divergence $θ = 0.033 rad$ . The 3.5-fold reduction in half-divergence is equivalent to a 3.5-fold increase in the MFD of the TEC fiber.

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Fig. 5. (a) Mode matching efficiency between fiber and cavity mode for a symmetric concave cavity. The blue line shows the initial SM300 fiber for the FFPC, where the coupling efficiency is about 30% at the cavity length of $50 μ m$ . The green line is the result after TEC treating; the efficiency can achieve 75% when the cavity length is $300 μ m$ . (b) Mode matching between the fiber and cavity mode for a plano-concave cavity. Considering the flat end coupling with the cavity mode, as the dotted line shows, the initial fiber can form a stable cavity with coupling efficiency around 20%; when the MFD comes to $7.7 μ m$ , the coupling efficiency can always be above 90%, as the solid line shows. The purple line shows that the coupling efficiency can be more than 95% with a large cavity length of around $400 μ m$ .

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Xin-Xia Gao, Jin-Ming Cui, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo. Thermal expanded core ultraviolet fiber for optical cavity mode matching[J]. Chinese Optics Letters, 2019, 17(9): 090601.

Thermal expanded core ultraviolet fiber for optical cavity mode matching Download： 870次

Fig. 1. Simulation of refractive index distribution versus radial distance from the fiber core with different thermal expanding times.

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Thermal expanded core ultraviolet fiber for optical cavity mode matching Download： 870次

Fig. 1. Simulation of refractive index distribution versus radial distance from the fiber core with different thermal expanding times.

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