Time-domain characterization of electric field vector in multi-terahertz pulses using polarization-modulated electro-optic sampling

TL;DR

This paper introduces a novel polarization-modulated electro-optic sampling method to accurately characterize the electric field vector of multi-terahertz pulses in the time domain, enabling advanced polarization and nonlinear response studies.

Contribution

The authors developed a modified POMEOS technique capable of handling ultrabroadband gate pulses, validated through simulations, achieving high accuracy in electric field vector measurement.

Findings

Achieved ~1 mrad accuracy in electric field measurement.

Validated method through numerical simulations.

Applicable to polarization and nonlinear response studies.

Abstract

We demonstrated characterizing the electric field waveform of multi-terahertz pulses (10-50 THz) as vector quantities in the time domain by applying the polarization modulated electro-optic sampling (POMEOS) method. The problem of an ultrabroadband gate pulse was solved by modifying the fitting function in POMEOS and its validity was confirmed through numerical simulations. High accuracy and precision of approximately 1 mrad with 3 s accumulation were demonstrated. Our method can be applied not only to multi-terahertz polarization measurements for linear response but also to the evaluation of the driving field of intense pulses for nonlinear response or material control.