Kramers–Kronig relation in a Doppler-broadened Λ-type three-level system<xref ref-type="fn" rid="cpb151140fn1">*</xref>

Kramers–Kronig relation in a Doppler-broadened Λ-type three-level system*

Wang Meng^a),^b), Lu Xiao-Gang^a), Bai Jin-Hai^a), Pei Li-Ya^c), Miao Xing-Xu^a), Gao Yan-Lei^a),^b), Wu Ling-An^a), Fu Pan-Ming^a), Yang Shi-Ping^b), Pang Zhao-Guang^b), Wang Ru-Quan^a), Zuo Zhan-Chun^a)

(a)–(c) Imaginary and (a′)–(c′) real parts of χ ( Δ ₁/ Γ ₁₀) as a function of Δ ₁/ Γ ₁₀ for Δ ₂/ Γ ₁₀ = 0 [(a) and (a′)], 30 [(b) and (b′)], and 50 [(c) and (c′)] with Γ ₁₀/ ku = 0.05, Γ ₂₀/ Γ ₁₀ = 0.1, and G ₂/ Γ ₁₀ = 1. In panel (a), the minimum of χ ″ is normalized to −1, while in panels (b) and (c), the maximum of χ ″ is normalized to 1.