Noncritically phase-matched self-difference frequency generation using transition-metal doped chalcogenides

We revisit self-difference frequency generation –– nonlinear mixing of the lasing field induced by stimulated emission with its pump source in a laser gain medium –– by employing transition-metal doped chalcogenides along with the standard birefringent phase-matching techniques for mid-infrared applications. The use of an a-cut Cr:CdSe crystal under the noncritical PM condition has significantly improved the conversion efficiency compared to the previous results obtained in a Cr:ZnSe slab with Fresnel phase-matching. To generalize the self-mixing design, the phase-matching conditions of solid solutions CdSxSe1-x doped with Cr2+ and Fe2+ ions are characterized in the mid-infrared spectral range.

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