Chinese Optics, Volume. 18, Issue 3, 672(2025)
Application of convolutional fitting in Fabry-Perot (F-P) resonator linewidth measurement
Fig. 4. Effects of data binning on signal resolution. (a) Raw spectral data; (b) binned signal reconstruction results
Fig. 8. Frequency calibration results for cavity 1. (a) Triangular wave signal for controlling the PZT, linear region: 0.24 s; (b) beat frequency signal, peak-to-peak: 15.69 MHz
Fig. 10. Measurement results of cavity 2 by swept-frequency method
Fig. 11. Measurement results of cavity 1 by swept-frequency method
Table 1. Comparison of measured and theoretical laser linewidth values at different attenuation points (RBW=7.5 kHz)
View tableView in ArticleTable 1. Comparison of measured and theoretical laser linewidth values at different attenuation points (RBW=7.5 kHz)
测量结果/Hz 洛伦兹线形 高斯线形 −3 dB 8983 2Δν 1.41Δν −10 dB 16619 6Δν 2.58Δν −20 dB 23806 20Δν 3.65Δν
Table 2. Laser linewidth at −20 dB (RBW=1 kHz)
View tableView in ArticleTable 2. Laser linewidth at −20 dB (RBW=1 kHz)
序号 测量结果/Hz 1 39595 2 43387 3 48260 4 35266 5 45008
Table 3. Frequency tuning speeds over 10 cycles
View tableView in ArticleTable 3. Frequency tuning speeds over 10 cycles
序号 调谐速度(MHz/s) 1 65.891 2 67.058 3 64.370 4 64.468 5 64.742 6 67.588 7 64.635 8 64.687 9 67.083 10 67.320 平均值 65.891 标准差 1.396
Table 4. Linewidth measurement results of cavity 2
View tableView in ArticleTable 4. Linewidth measurement results of cavity 2
激光线宽/kHz 腔线宽/kHz 注：激光线宽的参考值由3.1给出，腔线宽的参考值为出厂值 G-L拟合 10.84±0.91 4.42±0.50 L拟合 - 8.97±0.42 参考值 11.59±1.23 4.17
Table 5. Linewidth measurement results of cavity 1
View tableView in ArticleTable 5. Linewidth measurement results of cavity 1
腔线宽/kHz L拟合 204.1±11.2 G-L拟合 203.9±11.2
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Yi QI, Xue-rong GAO, Shao-xin WANG, Pan LI, Qi-hao SHEN, Ke-qi QI, Zi-ren LUO, He-shan LIU. Application of convolutional fitting in Fabry-Perot (F-P) resonator linewidth measurement[J]. Chinese Optics, 2025, 18(3): 672
Category: Special Column on Space-based Gravitational Wave Detection
Received: Feb. 10, 2025
Accepted: --
Published Online: Jun. 16, 2025
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