Proposal for CEP measurement based on terahertz air photonics

Abstract

Single-shot carrier envelope phase (CEP) measurement is a challenge in the research field of ultrafast optics. We theoretically investigate how an intense terahertz pulse modulates second harmonic emission (SH) from a gas plasma induced by a few-cycle laser pulse (FCL). Results show that the modulation quantity of SH intensity has a cosinoidal dependence on the CEP of FCL pulses, based on which we propose a low energy, all-optical method for single-shot CEP measurements via using a known intense terahertz pulse. Moreover, we propose an experimental realization.

Keywords

ultrafast measurements / far-infrared or terahertz / ultrafast nonlinear optics / harmonic generation and mixing

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Acknowledgements

We acknowledge the support from the National Natural Science Foundation of China (Grant Nos. 61475054, and 11574105), Fundamental Research Funds for the Central Universities (No. 2017KFYXJJ029). KJ Wang thanks Dr. Hu Wang for his previous calculation about this work.

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