Two-exciton absorption of light in MnF2 during four-photon excitation
V. P. DokashenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRV. V. EremenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRÉ. V. MatyushkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSRR. Ya. BronPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR
ABI
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When luminescence from the antiferromagnet MnF2 (νmax≃17000 cm‒1) was excited by radiation from a neodymium-glass laser (ν ≃ 9400 cm‒1) the integral luminescence intensity was observed to increase as the fourth power of the exciting power. The cross section for absorption of light in this process is σ ≃ 10‒27cm2. The results of this experiment indicate that two-exciton absorption of light has been observed, in which two excitons are simultaneously excited by the absorption of two photons each.
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