Fig. 1. Schematic diagram of three typical pulse laser cleaning methods^[10]

Fig. 2. Schematic diagram of three typical effects in laser paint removal of aircraft skin: (a) Thermoelastic vibration effect; (b) Ablative effect; (c) Plasma shock effect

Fig. 3. The paint removal threshold values vs paint thickness^[18]

Fig. 4. Influence of different pulse width on laser paint removal^[10,24-27]

Fig. 5. Schematic diagram of multi pulse laser paint removal

Fig. 6. Influence of different defocusing amount on spot diameter

Fig. 7. Influence of different scanning speed on laser paint removal：(a) Ablation depth; (b) Simulation results; (c) Measured paint removal morphology

Fig. 8. Pulse laser scanning path：(a) “Bow” shaped spot walking route；(b) “Zigzag” shaped spot walking route；(c) Schematic diagram of minimum overlap

Fig. 9. Schematic diagram of laser energy density control range for laser paint removal of aircraft skin

Fig. 10. Effect evaluation of laser paint removal for aircraft skin: (a) Preliminary judgment of visual inspection; (b) Microstructure test; (c) Mechanical property test

Fig. 11. Mechanical property test results of microstructure and properties of substrates with different burn degrees during laser paint removal of metal skin of an aircraft： （a） Microstructure chart； （b） Scan organization chart； （c） Conductivity, hardness and tensile strength test results

Fig. 12. Typical laser paint removal system for aircraft^[49]: (a) LCR of the LR Systems; (b) Laser paint removal system for helicopter rotor blades of the General Laser tronics; (c),(d) ARLCRS system for removing paint layer of F-16 fighter

Fig. 13. Prototype of digital laser paint removal system for the skin of a military aircraft