Proposal for CEP measurement based on terahertz air photonics
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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.
Keywordsultrafast measurements far-infrared or terahertz ultrafast nonlinear optics harmonic generation and mixing
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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). KJWang thanks Dr. HuWang for his previous calculation about this work.