Fig. 1. Schematic diagram of typical planar parallel waveguide laser structure^[7]

Fig. 2. 5 kW planar waveguide output laser before and after AO correction by Raytheon^[8]

Fig. 3. Mobile ground-based air defense directed energy laser weapon on a jeep^[9]

Fig. 4. Schematic diagram of thin-film laser thermal management structure (a) and multi-pass pump coupling structure (b)^[11]

Fig. 5. Boeing's resonant cavity Yb:YAG laser ^[10,15]

Fig. 6. Schematic diagram of general atomics' immersion liquid-cooled solid-state laser^[16]

Fig. 7. Physical picture of general atomic immersion liquid-cooled solid-state laser (single-module laser oscillator)^[19]

Fig. 8. (a) Schematic diagram of coherent synthesis of common apertures; (b) Schematic diagram of coherent synthesis of spliced apertures^[11]

Fig. 9. Demonstration of MIT/LL's 21-beam fiber laser coherent combining technology^[26]

Fig. 10. Optical phased array composed of four modules (the blue mirror is the 21 beams of fiber laser that actually emit light at present)^[28]