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We study resonance contrast by a two-step pulse observation method to enhancethe frequency stability of coherent population trapping (CPT) atomic clocks.The proposed method is a two-step Raman--Ramsey scheme with low intensityduring resonance observation and high intensity after the observation. Thismethod reduces the frequency variation in the light intensity and maintains ahigh signal-to-noise ratio. The resonance characteristics were calculated bydensity matrix analysis of a $\Lambda$-type three-level system that was modeledon the $^{133}$Cs D1 line, and the characteristics were also measured using avertical-cavity surface-emitting laser and a Cs vapor cell.

Two-step pulse observation to improve resonance contrast for coherent population trapping atomic clock