In order to stabilize the Zeeman laser accurately within a short period of time at different ambient temperatures

a temperature trajectory control based preheating method is proposed by planning the tube temperature trajectory as a modified exponential function of preheating time and tracing the planned trajectory precisely with the predictive functional control arithmetic. And experiments are made to prove the effectiveness of the proposed method. Experimental results indicate that

the Zeeman laser using the proposed method can be preheated effectively at an ambient temperature in the range of 15-25°C

so that the laser frequency can be locked in 16 minutes with a temperature-dependent frequency drift kept below 0.25MHz.