Fig. 4: Optical properties of Nd:Al2O3. | Light: Science & Applications

Fig. 4: Optical properties of Nd:Al2O3.

From: Gain in polycrystalline Nd-doped alumina: leveraging length scales to create a new class of high-energy, short pulse, tunable laser materials

Fig. 4

a Pictures of Nd-doped and undoped ceramics. b Transmission measurements of the Nd:Al2O3 and undoped Al2O3. All the ceramics show high transmission, and importantly, the Nd-doped samples have absorption bands characteristic of Nd3+ transmission. The corresponding absorption cross sections in the area of interest are shown in the inset. c PL emission spectra for the 0.25 at.% and 0.35 at.% Nd3+:Al2O3 samples along with 0.5 at.% Nd3+:Glass and 1.1 at.% Nd3+:YAG single crystal. The pump source is an 806 nm laser diode. The PL reveal broadened lines attributed to the 4F3/2 → 4I11/2 electronic transitions. d the radiative lifetimes at 1064 nm for the Nd:Al2O3 ceramics produced under similar CAPAD processing conditions, and log scale intensity is also shown. The lifetimes are 152 μs and 141 μs for the 0.25 and 0.35 at.% Nd:Al2O3, respectively. e the resultant emission cross-sections, σEm, using the Fuchtbauer–Landenburg relationship (Eq. 2). The emission cross section peak is σEm = 7.5 × 10−21 cm2 for 0.25 at.% and 9.8 × 10−21 cm2 for 0.35 at.% Nd:Al2O3 ceramics

Back to article page