Intense high-order harmonics from carbon plasma for intense attosecond pulse generation

Summary form only given. Generation of intense isolated attosecond pulses is of significant importance to explore new domains in attosecond science. Recently, we have demonstrated high-order harmonic generation (HHG) with high conversion efficiency using low-density plasma as the nonlinear medium [1,2], instead of gas. However, isolated attosecond pulses have yet to be demonstrated from plasma. In this work, we apply the Double Optical Gating (DOG) [3] method to generate continuum high-order harmonics from lowly ionized carbon plasma, which is the first step toward the generation of intense attosecond pulses.