Fig. 1. Pressure isoline distributions at moments of time 0.5, 1, and 1.3 ns (from left to right) after the beginning of the laser pulse. The porous layer initially occupies the area from 100 to 600 μm.

Fig. 2. Pressure (black line) and temperature (red line) distributions along the optical axis of the laser beam at the moment of time 1.3 ns. The porous layer initially occupies the area from 100 to 600 μm.

Fig. 3. Dependences of delay degree t_p/t_c (a) and ionization wave passage time t_p (b) on layer thickness S at a laser intensity of 10¹⁴ W cm⁻² for two wavelengths 0.53 μm (solid lines) and 0.35 μm (dotted lines) and for three densities 10 mg cm⁻³ (black lines), 5 mg cm⁻³ (red lines), and 2 mg cm⁻³ (green lines).

Fig. 4. Dependences of delay degree t_p/t_c (a) and ionization wave passage time t_p (b) on layer thickness S at a laser intensity of 10¹⁵ W cm⁻² for two wavelengths 0.53 μm (solid lines) and 0.35 μm (dotted lines) and for three densities 10 mg cm⁻³ (black lines), 5 mg cm⁻³ (red lines), and 2 mg cm⁻³ (green lines).

Fig. 5. Dependences of optimal pulse energy (a) and average ionization wave velocity (b) on layer thickness S at a laser intensity of 10¹⁴ W cm⁻² for two wavelengths 0.53 μm (solid lines) and 0.35 μm (dotted lines) and for three densities 10 mg cm⁻³ (black lines), 5 mg cm⁻³ (red lines), and 2 mg cm⁻³ (green lines).

Fig. 6. Dependences of optimal pulse energy (a) and average ionization wave velocity (b) on layer thickness S at a laser intensity of 10¹⁵ W cm⁻² for two wavelengths 0.53 μm (solid lines) and 0.35 μm (dotted lines) and for three densities 10 mg cm⁻³ (black lines), 5 mg cm⁻³ (red lines), and 2 mg cm⁻³ (green lines).