Abstract
Upconversion emission at 480 nm in Tm:LaF3 crystals was reported with continuous excitation in the red[l] and the excitation at 635.2 nm produced photon avalanche upconversion emission. However, the upconversion emission has not been investigated in this crystal for pulse laser excitation. In this paper, we report the separation of two kinds of two-step upconversion processes for the blue upconversion emission in the crystal. One process is a single pulse sequential two-step absorption process of the 3H6 → 3F2 and 3H4 → 1D2 transitions and the other two-step absorption process is produced by the successive pulse excitations from 3H6 to 3F2 and from 3F4 to 1G4. Pulse repetition rate dependence of the emission at 480 nm with an excimer-laser pumped dye laser excitation in Fig.1 shows the separation of two upconversion processes. The emission at 656 nm excitation even with 1 Hz indicates the single pulse two-step upconversion, although it increases due to the accumulation of the population in the 3H4 level when the repetition rate does.
© 1998 IEEE
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