Polarization-Tunable Ring Cavity Laser Output Based on Side Hole Fiber

Yi Yu; Youlong Yu; Peiming Wang; Qinzhi Zhou; Qianchun Yu

doi:10.3788/CJL240796

Chinese Journal of Lasers, Volume. 52, Issue 2, 0206001(2025)

Polarization-Tunable Ring Cavity Laser Output Based on Side Hole Fiber

Yi Yu, Youlong Yu^*, Peiming Wang, Qinzhi Zhou, and Qianchun Yu

Anhui Provincial Key Laboratory of Measurement Theory and Precision Instruments, School of Instrument Science and Optoelectronic Engineering, Hefei University of Technology, Hefei 230009, Anhui , China

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Figures & Tables(14)

Fig. 1. Schematic diagram of coordinate system

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Fig. 2. Schematic diagram of experimental device

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Fig. 3. Laser output spectrum at driving current of 300 mA

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Fig. 4. Variation of tan γ with θ

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Fig. 5. Variation of $ϕ$ with θ

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Fig. 6. Variation of adjustment range of tan γ with $θ_{0}$

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Fig. 7. Calibration of torsion angle sensitivity at different SHF lengths

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Fig. 8. Spectrum without twist and strain

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Fig. 9. Output power and wavelength of the laser versus twist angle. (a) Power; (b) wavelength

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Fig. 10. Output power and wavelength of the laser versus strain. (a) Power; (b) wavelength

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Table 1. Coefficients of fitting formula of tan γ and θ
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Table 1. Coefficients of fitting formula of tan γ and θ
θ /（°） a₁ b₁ R²
91‒124 0.01426 -1.29583 0.95488
124‒160 -0.0134 2.15046 0.98929

Table 2. Coefficients of fitting formula of $ϕ$ and θ
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Table 2. Coefficients of fitting formula of $ϕ$ and θ
θ /（°） $a_{2}$ b₂ R²
5‒97 -1.07921 6.09776 0.9871
97‒180 1.1741 -207.83496 0.96708

Table 3. Comparison of different torsion angle measurement solutions

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Table 3. Comparison of different torsion angle measurement solutions

Measurement solution	Measuring range /（°）	Measurement resolution /（°）
Ours	0‒90	0.0137
Torsion angle table	0‒360	0.1‒1
Angle encoder	0‒360	0.01
Potentiometer	0‒360	0.1‒1
Torque sensors	0‒360	0.01‒0.1

Table 4. Coefficients in output laser power and strain fitting equation

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Table 4. Coefficients in output laser power and strain fitting equation

Strain /10^-6	k₂_ε	R²
0‒167	-2.73×10^-4	0.978
167‒300	-0.52×10^-4	0.990
300‒433	0.9×10^-4	0.983
433‒667	3.31×10^-4	0.991
667‒900	-3.55×10^-4	0.981
900‒1067	-0.68×10^-4	0.968
1067‒1400	3.13×10^-4	0.977
1400‒1533	-3.07×10^-4	0.982

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Yi Yu, Youlong Yu, Peiming Wang, Qinzhi Zhou, Qianchun Yu. Polarization-Tunable Ring Cavity Laser Output Based on Side Hole Fiber[J]. Chinese Journal of Lasers, 2025, 52(2): 0206001

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