Method to quickly estimate T₁ value by suppressing spin exchange relaxation and magnetic field gradient relaxation in atomic sensors

The accuracy of atomic sensor is determined by the transverse nuclear spin relaxation time (T 2 ). As the longitudinal nuclear spin relaxation time (T 1 ) is the upper limit of T 2 , it becomes an important metric for evaluating the merits of alkali vapor cells. However, the conventional method for measuring T 1 of pulse delay takes dozens of minutes, which will increase the effect of random errors during the testing process. In order to solve this problem, a method to quickly estimate the value of T 1 is proposed by suppressing the influence of spin exchange relaxation and magnetic field gradient relaxation terms on T 2 . Experimental results indicate that the accuracy is maintained at above 95%, and the testing time is reduced to less than 5%.