Fig. 1. Proportion of higher-order cavity mode excitement in a misadjusted CRDS system.腔误调时高阶模功率耦合占比情况

Fig. 2. Simulation of ring-down curves affected by the finite shutdown time.受有限的关断时间影响的衰荡曲线仿真

Fig. 3. Schematic of CW-CRDS experimental instrument.CW-CRDS实验装置图

Fig. 4. (a) Typical decays, (b), (c) distributions of ring-down time, and (d) decay curve fitness in four times averaged mode sampling.四次平均模式下的(a)衰荡曲线、(b), (c)衰荡时间及(d)拟合度分布

Fig. 5. Multimode excitation in ring-down cavity.衰荡腔内存在多模激发

Fig. 6. Typical decays in single sampling.单次采样的典型衰荡曲线

Fig. 7. Variance of the frequency of good decays with trigger thresholds.优衰荡出现频率随触发阈值的变化

Fig. 8. Allan deviations in single sampling with different trigger thresholds:　(a) 10.7 mV; (b) 14.7 mV; (c) 18.7 mV; (d) 22.7 mV不同阈值单次采样下的Allan方差图　(a) 10.7 mV; (b) 14.7 mV; (c) 18.7 mV; (d) 22.7 mV

Fig. 9. Allan deviations of 40 decays with different trigger thresholds.不同阈值下40个衰荡过程的Allan方差

Fig. 10. Noise equivalent absorption coefficients and sensitivities under different trigger thresholds.不同阈值的噪声等效吸收系数及测量灵敏度

Fig. 11. Distributions of ring-down times (a) and curve fitness (b) in single sampling.单次采样模式下的衰荡时间(a)及曲线调整拟合度(b)分布