Figure 4

(a)–(c) Measured CTS of EF2 and signals versus δ at different Δac values. Coexisting
and EF2 signals versus δ in free space shown in the inset of (a) and measured FWM-induced EIA dips shown in the insets of (b). (d) Measured CTS of EF2 and
signals versus Δac with (solid curve) and without (dashed curve) E2. (e) Calculated FWM-induced EIA (top curve) and CTS (bottom curve) with coexisting EF2 and
versus δ. (f) Phase-matching of OPA process seeded with ES.