中文摘要：

从理论上分析了铷原子蒸汽温度对^87Rb和^85Rb D2线饱和吸收光谱在消除了多普勒背景情况下的光谱相对强度的影响.由于有效原子数密度、多普勒加宽、电极化率受温度变化的影响，每一条超精细谱线的相对强度随着温度的升高都会出现先增大后减小的变化趋势，相对强度最高时的温度称为最佳温度.对于^87Rb 或^85Rb来说，不同超精细谱线最佳温度不同的主要原因是由于烧孔面积和跃迁几率不同造成的，而^87Rb 和^85Rb不同超精细谱线最佳温度不同的主要原因是由于它们在自然界中丰度不同造成的.

英文摘要：

Temperature dependence of the relative intensities of the Doppler-free signals of ^87Rb and ^85Rb D2 line in saturation spectroscopy is analyzed theoretically. With the increase of temperature, the relative intensity of each Doppler-free hyperfine spectroscopy has a trend of increase at the beginning, then decrease as the result of the influence of the effective atomic number density, Doppler-broadening and the susceptibility. The temperature corresponding to the highest relative intensity is called optimum temperature. It is hole-burning area and transition probability that mainly result in the optimum temperature difference of different Doppler-free hyperfine spectroscopy for ^87Rb or ^85Rb, while the optimum temperature differences between ^87Rb and ^85Rb are mainly caused by the abundance in natural.