Fig. 3: Laser performance characterisation.
From: Continuous-wave quantum dot photonic crystal lasers grown on on-axis Si (001)
a Measured spectra under various input pumping powers of the PC laser with a = 310 nm and r/a = 0.27, the lasing peak locates within the ground state emission. b Collected L–L curve and linewidth of the lasing peak at 1306 nm, indicating a lasing threshold 0.6 μW. The inset shows Lorentzian curve fitting of measured data just below the threshold, which indicates a linewidth ~0.68 nm. c The lasing wavelength under various input pumping powers. The error bars in b, c express standard errors deduced by fitting. d Logarithmic L–L plot of the PC laser. Dots show the experimental data and the solid lines are theoretically calculated results for various values of β by using rate equation analyses. e Normalised PL spectra from representative PC lasers above lasing threshold.
