Fig. 1. Laser field waveform and instantaneous effective Keldysh parameter. (a) Electric field waveform of OTC laser field; (b) instantaneous effective Keldysh parameter

Fig. 2. Combined potential barrier and two kinds of tunneling trajectories

Fig. 3. PMD analysis of non-adiabatic tunneling ionization. (a) PMD obtained by SFA with imaginary-time method; (b) tunneling delay time

Fig. 4. Analysis of non-adiabatic tunneling ionization characteristic

Fig. 5. PMD with different field intensity ratios. (a) κ=0.98; (b) κ=0.85; (c) κ=0.70

Fig. 6. Analysis of tunneling delay time and non-adiabatic characteristics at κ=0.70. (a) Tunneling delay time; (b) analysis of non-adiabatic tunneling ionization characteristics

Fig. 7. Regulation of tunneling delay time by changing the field intensity ratio

Fig. 8. PMD analysis of non-adiabatic tunneling ionization at -π/20 phase difference. (a) PMD; (b) tunneling delay time

Fig. 9. Regulation of tunneling delay time by changing the phase difference