Chinese Optics Letters, Volume. 21, Issue 11, 111901(2023)
Doubly resonant second-harmonic generation in a fiber-based tunable open microcavity
Figures & Tables(6)
Fig. 1. Illustration of the fiber-based FP microcavity for doubly resonant SHG. The right inset shows a zoomed-in view of the top DBR mirror on the tip of a single-mode optical fiber. The left inset shows a zoomed-in view of the bottom DBR mirror on a fused silica substrate.
Fig. 2. Microcavity optimization for double resonance. (a), (b) The reflectivity of the two FASH mirrors at FH and SH wavelength, respectively; (c) effects of the changes of SiN thickness on the SH mode wavelength when the FH wavelength is fixed based on the tunability of open cavity; (d) the spectrum of FH and SH modes for Lair = 0.96 µm. The inset shows the field distributions of the output FH and SH modes just after entering the fiber.
Fig. 3. (a) Electric field profile in front view and vertical view of the FH and SH modes; (b) loaded Q-factors of the FH mode and SH mode as functions of Ntop; (c) relationship between Qr_FH2Qr_SH and β with different number of Ntop; (d) SHG conversion efficiency as a function of Ntop.
Fig. 4. (a) Center wavelength corresponding to the two resonant modes when the cavity length is continuously adjusted; (b) the matching bandwidth Δλm as a function of the longitudinal mode index m; (c) spectrum with 33.37 µm cavity length; (d) for different thicknesses of SiN, the corresponding wavelength achieving alignment between FH and SH waves by changing the cavity length.
Table 1. Main Parameters of the Fiber-Based Open Cavities with
L air = 1.94 µmView tableView in ArticleTable 1. Main Parameters of the Fiber-Based Open Cavities with
L air = 1.94 µmNtop Qr_FH Qr_SH VFH (λ/n)3 VSH (λ/n)3 β rc_FH rc_SH η (W−1) 5 210 860 4.75 13.21 0.00188 0.705 0.691 9.78 × 10−4% 7 596 3285 4.42 12.89 0.00193 0.733 0.735 3.64 × 10−2% 10 3888 26,982 4.38 12.80 0.00194 0.729 0.735 12.80% 12 10,902 92,041 4.38 12.79 0.00194 0.715 0.725 325.60% 14 23,312 226,908 4.38 12.79 0.00194 0.671 0.674 3006.60%
Table 2. Different Structures of Double Resonances
View tableView in ArticleTable 2. Different Structures of Double Resonances
Ref. Structure β Qr_FH/Qr_SH λSH (nm) Processing Difficulty Coupling Approach [ 14 ]a AlGaAs/Al2O3 micropillar 0.018 5000/1000 Single, 750 Challenging (irregular) Free space [ 15 ]b LN WGM resonator 0.00001 3.4 × 107/− Single, 532 Etching Free space [ 44 ]a AlGaAs nanoring 0.004 104/>106 Single, 775 Etching Waveguide [ 43 ]a AlGaAs PhC 0.01 3.6 × 104/1100 Single, 775 Challenging (etching, careful optimization) Free space Al0.3Ga0.7As PhC 0.0035 1.1 × 105/400 Single, 775 Free space [ 41 ]a GaN PhC ∼0.005 105/104 Single, 650 Etching Free space [ 37 ]a ZnO PhC 0.001 3 × 105/2.95 × 106 Single, 376 Etching Free space [ 45 ]a GaAs PhC nanobeam 0.00021 106/4000 Single, 910 Etching Free space 0.00012 6 × 104/4000 Single, 910 Etching Free space [ 33 ]b MoS2 FP cavity – 77/46 Single, 462 No etching Free space Our work a LN FP open cavity (short length) 0.002 2.33 × 104/2.27 × 105 Single, 655 No etching Fiber LN FP open cavity (long length) 0.0001 600/3300 Tunable, 652-660 No etching Fiber
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Xinhang Kong, Zhuojun Liu, Lijun Song, Guixin Qiu, Xuying Wang, Jiantao Ma, Dunzhao Wei, Jin Liu. Doubly resonant second-harmonic generation in a fiber-based tunable open microcavity[J]. Chinese Optics Letters, 2023, 21(11): 111901
Paper Information
Category: Nonlinear Optics
Received: Jun. 6, 2023
Accepted: Jun. 26, 2023
Posted: Jun. 26, 2023
Published Online: Nov. 6, 2023
The Author Email: Zhuojun Liu (zhuojunliu@pku.edu.cn), Dunzhao Wei (weidzh@mail.sysu.edu.cn)
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