Carrier-envelope phase measurement from half-cycle high harmonics.
We present an efficient method to observe the high harmonics generated in individual half-cycle of the driving laser pulse by mixing a weak ultraviolet pulse, and then the cutoff of each half-cycle harmonic is imaged. The simulation shows that the information of the driving laser pulse, including the laser intensity, pulse duration and carrier-envelope phase, can be in situ retrieved from the harmonic spectrogram. In addition, our results show that this method also distinguishes the half-cycle high harmonics for a pulse longer than 10 fs, suggesting a potential to extend the CEP measurement to the multi-cycle regime.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Pengfei
P
Lan
Peixiang
P
Lu
Fang
F
Li
Yuhua
Y
Li
Zhenyu
Z
Yang
D000465:Algorithms; D003198:Computer Simulation; D007834:Lasers; D008962:Models, Theoretical; D010783:Photometry / Q000379:methods*