The final stage is cladding-pumped, where pump light is delivered through a signal-pump combiner.
When pump light (high energy) and carrier light (low energy) simultaneously transmit through graphene, sufficiently increasing the intensity of pump light can limit the absorption of carrier light.
θ is the angle between polarization direction of the pump light (0°) and the polarizer.
Excited by pump light, optical interband transition occurs as shown in Figure 6a.
Fig. 7 a Schematic structure of the proposed metasurface with pump light.
Fig. 8 a Schematic structure of the CdO-based metasurface with pump light.
By trapping the pump light within the 2V-shaped cavity, efficient multi-pass absorption is achieved.
Pump light propagation and output laser characteristics are both explored by solving the related rate equations.
Pump light (1,060 nm) and carrier (signal) light (1,550 nm) together transmit through the microfiber and the intensity of carrier light varied with pump light, as is shown in Figure 7b,c,d.
Pump light and carrier light (signal) propagate in the waveguide simultaneously and the intensity of carrier light follow the changes of pump light with a modulation speed of (b) 10 kHz, (c) 100 kHz, and (d) 1 MHz.
The pump light beam alignment onto the same spot as the IR light beam is done with two mirrors.
