Several multiphoton absorptions have been observed in ${\mathrm{Nd}}^{3+}$:${\mathrm{La}}_{\mathrm{x}}$${\mathrm{Ce}}_{1\mathrm{-}\mathrm{x}}$${\mathrm{Cl}}_3$ crystals. Preliminary results and an attempted interpretation are presented.

• Received 27 April 1987

DOI:https://doi.org/10.1103/PhysRevB.36.4425