Transient Decay Background After Green Repump Pulse

GaP-on-Diamond NV Center Spin-Photon Interface | Yama et al., arXiv:2601.04733

51.13 us
Slow Decay Constant (tau2)
0.967
Bi-Exponential R-squared
34.4%
AOM Contribution

Signal Decomposition

Model Fit Comparison

Bayesian Model Probabilities

T1 Measurement Bias

Fit Model Results

Model R-squared BIC AIC Status
Mono-exponential 0.945 -4081.4 -4094.0 Good
Bi-exponential 0.967 -4319.2 -4340.3 Best
Stretched exponential 0.952 -4142.7 -4159.6 Good

T1 Extraction Bias Analysis

True T1 (us) Naive T1 (us) Bias (%) Corrected (%)
5049.94-0.130.00
10099.01-0.990.00
200195.73-2.130.00
500463.28-7.340.00
1000795.52-20.450.00
50.45 us
MC tau2 Mean (n=50)
0.82 us
MC tau2 Std Dev
-4319.2
Best Model BIC
237.8
Delta BIC vs Mono-exp
20.45%
Max T1 Bias (no subtraction)
0.00%
Max Bias After Correction

Conclusions

The transient background signal is best described by a bi-exponential decay with tau1 = 1.00 us and tau2 = 51.13 us (R-squared = 0.967). The AOM contributes approximately 34.4% of the total transient amplitude, with sample-related processes (GaP defect luminescence, diamond nitrogen aggregates) accounting for 65.6%. Bayesian model comparison decisively favors the sample-origin hypothesis (log Bayes factor = 51.6). The transient introduces up to 20.45% systematic bias in T1 extraction at T1 = 1000 us, fully corrected by bi-exponential subtraction. Monte Carlo analysis yields tau2 = 50.45 +/- 0.82 us (95% CI: [49.14, 51.98] us).