Temperature Dependence of the Linewidths and Amplitudes of the Sub-Doppler Resonances of ⁸⁷Rb D₂ Line Detected with σ(σ)-Polarized Pumping and Probe Laser Beams

We asses impact of the temperature of ⁸⁷Rb atoms on the linewidths and amplitudes of the F = 1 → F′ = 0, 1, 2 and F = 2 → F′ = 1, 2, 3 hyperfine resonances of the ⁸⁷Rb D₂ line, using the circularly-polarized pumping beam and the probe laser beam. To achieve high-precision and accuracy, frequency-stabilized narrow-linewidth extended-cavity diode lasers, we employ a temperature-controlled Fabry–Pérot interferometer and a magnetically-shielded temperature-controlled Rb cell with dimensions in the centimeter range, containing enriched ⁸⁷Rb atoms. Consequently, the linewidth and amplitude measurements are conducted with inaccuracies of 1.5 MHz and 0.4 mV, respectively.