Abstract

Resonantly enhanced, near-ultraviolet 4f³ → 4f²5d two-photon transitions have been observed in trivalent neodymium-doped yttrium aluminum garnet (Nd³⁺:Y₃Al₅O₁₂). The two-photon excitation spectra over the 40 400–46 730 cm⁻¹ transition energy range are characterized by sharp resonance peaks on a slowly varying background caused by nonresonant transitions. The peak two-photon cross section involving the ²P_1/2 resonant intermediate state is 9 × 10⁻⁵¹ cm⁴ s, and the integrated cross section is 2.2 × 10⁻³⁸ cm⁴.

© 1993 Optical Society of America

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