Figure 8

(a) CPT signals in cell C for different powers. The cell temperature is 75 °C and the magnetic field magnitude is 20 μT. The background is removed for clarity (b) linewidth, contrast and contrast-to-linewidth ratio in different cells.
(a) CPT signals in cell C for different powers. The cell temperature is 75 °C and the magnetic field magnitude is 20 μT. The background is removed for clarity (b) linewidth, contrast and contrast-to-linewidth ratio in different cells.