Equation Icon  ˆ ˆ ˆ β(ω ) = f (Ω)ˆα (ω ) → β+ ≡ β(ωp + Ω) = f (ωp + Ω)ˆα (ωp + Ω ) ≡ f+αˆ+ and ˆβ†− ≡ ˆβ†(ωp − Ω) = f ∗(ωp − Ω )ˆα†(ωp − Ω ) ≡ f∗ˆα †− ; (288) −