Fig. 1. Schematic diagram of beam transformation and shaping of QCL spatial beam combining system (TEC: thermo-electric cooler)

Fig. 2. Numerical and experimental near field patterns before and after beam transformation and shaping

Fig. 3. Numerical and experimental far field patterns before and after beam shaping

Fig. 4. QCL output power and spectrum. (a) Output CW power versus time; (b) spectrum