Fig. 4: Horizontal polariton amplifier regime at 5K in W2. | Light: Science & Applications

Fig. 4: Horizontal polariton amplifier regime at 5K in W2.

From: Edge-emitting polariton laser and amplifier based on a ZnO waveguide

Fig. 4

a, b, c Real space emission with: a only “laser pump” (above lasing threshold); b only “reservoir pump” (below lasing threshold); c both pump spots (“laser” and “reservoir”). The vertical dashed lines show the crack where the amplification is measured. d Emission spectra extracted through the crack at the right of the reservoir pump (60 µm from the laser pump). The “reservoir” pump power is 8.9 W/cm2, which is below threshold for this specific cavity as one can see from the emission spectrum when only the “reservoir pump” is ON. The “laser” pump power is 6.9 W/cm2—above threshold for this cavity. The amplification factor is defined as the ratio between the most intense lasing peaks. The inset shows its evolution as a function of the reservoir pump

Back to article page