Proposal for CEP measurement based on terahertz air photonics

doi:10.1007/s12200-018-0845-6

Front. Optoelectron.

2018, Vol. 11

Issue (4) : 407-412 https://doi.org/10.1007/s12200-018-0845-6

RESEARCH ARTICLE

Proposal for CEP measurement based on terahertz air photonics

Kejia WANG, Xinyang GU, Jinsong LIU, Zhengang YANG, Shenglie WANG(

)

Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic information, Huazhong University of Science and Technology, Wuhan 430074, China

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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

Corresponding Author(s): Shenglie WANG

Just Accepted Date: 14 September 2018 Online First Date: 23 October 2018 Issue Date: 21 December 2018

Cite this article:

Kejia WANG,Xinyang GU,Jinsong LIU, et al. Proposal for CEP measurement based on terahertz air photonics[J]. Front. Optoelectron., 2018, 11(4): 407-412.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-018-0845-6
https://academic.hep.com.cn/foe/EN/Y2018/V11/I4/407

Fig.1 (a) and (b) Time variation of the electric field of the FCL pulses with

φ C E P = 0, π, ± π / 2

, respectively; (c)−(e) illustrations of the symmetries between FCL pulses with different CEP

Fig.2 (a) Dependence of the SH emission intensity on the CEP with and without intense THz pulse irradiation; (b)

Δ I 2 ω 0

versus CEP

Fig.3 Time dependence of polarized ionization rates

r (t)

for the gas plasma induced by FCL pulses without and with a THz field of 1 MV/cm (denoted by T) for (a)

φ C E P = 0

π

and (b)

± π / 2

Fig.4 (a) Time dependence of

r (t)

for

φ C E P = ± π / 2

(brown and purple line) and those with a fixed phase shift

φ S = π / 4

(solid line); (b) THz field-induced SH increment

Δ I 2 ω 0 T

versus the CEP for

φ S =0

(black line) and

π / 4

(green line)

Fig.5 (a) Experimental realization for our proposed single-shot CEP measurement method; (b) and (c) distributions of a large number of shots from a non-phase-stabilized laser depicted on a two-dimensional parametric plot with THz field-induced increment signals from channel 1 (C1) and channel 2 (C2) for the horizontal and vertical axes, respectively

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