Measuring Carrier-Envelope Phase of Few-Cycle Laser Pulses Using High-Order Above-Threshold Ionization Photoelectrons  

作　　者：邓勇开 黎敏 于济州 刘院省 刘运全 龚旗煌 

机构地区：[1]Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871 [2]Collaborative Innovation Center of Quantum Matter, Beijing 100871

出　　处：《Chinese Physics Letters》2014年第6期117-120,共4页中国物理快报（英文版）

基　　金：Supported by the National Program on Key Basic Research Project under Grant No 2013CB922403, and the National Natural Science Foundation of China under Grant Nos 11121091, 11134001, and 11125416.

摘　　要：We experimentally demonstrate the measurement of carrier-envelope phase of few-cycle laser pulses. We have built a stereo above-threshold ionization setup. The photoelectron energy spectra of high-order above-threshold ionization are measured in both the left and right directions in the linearly polarized laser fields. It is shown that the left-right asymmetry of the spectra is dependent on carrier-envelope phase of few-cycle laser pulses. Two asymmetry parameters from the low-energy and high-energy regions at the above-threshold ionization plateau map a phase ellipse, in which the points indicate the absolute value of carrier-envelope phase. We have calibrated the phase ellipse by comparison with the semiclassical calculation. This setup allows us to determine the value of the absolute phase of few-cycle laser pulses.We experimentally demonstrate the measurement of carrier-envelope phase of few-cycle laser pulses. We have built a stereo above-threshold ionization setup. The photoelectron energy spectra of high-order above-threshold ionization are measured in both the left and right directions in the linearly polarized laser fields. It is shown that the left-right asymmetry of the spectra is dependent on carrier-envelope phase of few-cycle laser pulses. Two asymmetry parameters from the low-energy and high-energy regions at the above-threshold ionization plateau map a phase ellipse, in which the points indicate the absolute value of carrier-envelope phase. We have calibrated the phase ellipse by comparison with the semiclassical calculation. This setup allows us to determine the value of the absolute phase of few-cycle laser pulses.

分 类 号：O432.1[机械工程—光学工程] TH724[理学—光学]