Fig. 2: Ultralow-threshold continuous-wave upconversion lasing. | Nature Communications

Fig. 2: Ultralow-threshold continuous-wave upconversion lasing.

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

Fig. 2

a, b. Red- (a) and green-band (b) emission spectra of an LQUM doped with Yb3+ and Er3+ around the lasing threshold. The laser lines corresponding to 2H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 are labeled as PeakH, PeakS, and PeakF, respectively. c, d Laser emission spectrum of PeakF near the laser threshold of sub-10 W cm−2 (c) and a laser emission intensity and linewidth measurement (d). e Generation of PeakH and PeakS. f Linewidth saturation of the laser lines with increasing pump power density.

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