Fig. 6: Tuning of laser emission wavelengths.

a Schematic of wavelength tuning achieved by controlling the pump power density (ΔP) and operation temperature (ΔT). The initial lasing wavelength and the shifted lasing wavelengths under the control of the pump power density and operation temperature are indicated by λ₀, λ_P and λ_T, respectively. b Emission spectra of spectrally tuned lasers. Δλ_P and Δλ_T indicate shifts in the lasing wavelength with increasing pump power density (from 0.01 to 3.16 MW cm⁻²) and operation temperature (from 298 to 423 K). c Stability analysis in terms of static (above) and dynamic (below) operations. Green and purple lines in static operation indicate the lasing peak intensity and spectral position depending on time, respectively. d, e Linear plots of the laser line peak wavelengths as a function of pump power density (d) and operation temperature (e).