Fig. 1. Schematic diagram of laser rock breaking

Fig. 2. Temperature distribution^[33] and phase transition of rock during fiber laser perforation

Fig. 3. Surface temperature distribution of granite under different irradiation time^[30]

Fig. 4. Physical and chemical phenomena of laser-rock interaction

Fig. 5. Homogeneous polymorphic transformation of quartz under temperature and pressure^[36]

Fig. 6. Temperature gradient of granite surface^[30]. SEM images of (a) melting zone; (b) damage zone; (c) heat-affected zone

Fig. 7. High-speed video image of laser-rock interaction plasma^[29]

Fig. 8. Variation of shale drilling specific energy (SE) with laser power under 0.5-inch beam diameter and 0.5-s exposure time^[28]

Fig. 9. Strength test of granite irradiated by laser^[47]

Fig. 10. Stress change in Z direction of sandstone by elliptic laser irradiation^[50].

Fig. 11. Laser interaction with granite in air and water environments^[54].(a) Top and bottom of laser perforated rock in air; (b) section of laser perforated rock sample in transparent water [(1) laser hole; (2) glass body; (3) plastic zone]