Fig. 5: Upconversion lasing with Tm3+. | Nature Communications

Fig. 5: Upconversion lasing with Tm3+.

From: Continuous-wave upconversion lasing with a sub-10 W cm−2 threshold enabled by atomic disorder in the host matrix

Fig. 5

a Upconversion luminescence and upconversion lasing in an LQUM doped with Yb3+ and Tm3+ (20 and 2%). The color inset shows an optical microscopy image of an illuminated LQUM. b Emission spectrum in the blue emission band around the lasing threshold of 1.5 kW cm−2. c A SEM image of an LQUM measuring 1.99 μm in diameter doped with Yb3+ and Tm3+.

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