In order to exploit its potential applications, we experimentally study the dependence of Rb-85-based coherent population trapping (CPT) resonance on N-2 buffer gas with 6 vapor cells filled with natural rubidium and N-2. The experiments are carried out at different pressures and temperatures, and the results reveal that higher cell temperature makes the resonance more sensitive to N-2 pressure. Thus, it is important to choose a proper buffer gas pressure at a given cell temperature. This work provides valuable data for the application of Rb-85 CPT resonance with a buffer gas of N-2.
