Retrieving the undistorted terahertz time-domain electric-field vector from the electro-optic effect

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Abstract

We formulate and experimentally demonstrate a method to retrieve the undistorted temporal profile of an elliptically polarized terahertz pulse from the electric-field (E-field) vector waveform detected by electro-optic (EO) sampling. This method takes into account the distortion effects due to pulse width of the probe laser, absorption by the EO crystal, and frequency-dependent phase mismatch between the probe and terahertz pulses inside the EO crystal. Even with this distortion, the detected elliptically polarized terahertz vector waveform can be simply interpreted as that at the center of the EO crystal for detection. This interpretation enables us to retrieve the undistorted terahertz E-field vector waveform in front of the EO crystal by analyzing the detected EO signals in the frequency domain and then reconstructing those in the time domain. In order to verify our method, we experimentally demonstrate that the same elliptically polarized terahertz waveform can be retrieved even when we use different EO crystals for detection. Although the terahertz E-field vector waveforms measured by different EO crystals are significantly different due to the distortions, the retrieved waveforms show a good agreement without need for additional corrections.

Original languageEnglish
Pages (from-to)1946-1956
Number of pages11
JournalJournal of the Optical Society of America B: Optical Physics
Volume34
Issue number9
DOIs
Publication statusPublished - 2017 Sep 1

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electro-optics
waveforms
electric fields
crystals
probes
pulses
pulse duration
sampling
profiles
lasers

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

Cite this

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title = "Retrieving the undistorted terahertz time-domain electric-field vector from the electro-optic effect",
abstract = "We formulate and experimentally demonstrate a method to retrieve the undistorted temporal profile of an elliptically polarized terahertz pulse from the electric-field (E-field) vector waveform detected by electro-optic (EO) sampling. This method takes into account the distortion effects due to pulse width of the probe laser, absorption by the EO crystal, and frequency-dependent phase mismatch between the probe and terahertz pulses inside the EO crystal. Even with this distortion, the detected elliptically polarized terahertz vector waveform can be simply interpreted as that at the center of the EO crystal for detection. This interpretation enables us to retrieve the undistorted terahertz E-field vector waveform in front of the EO crystal by analyzing the detected EO signals in the frequency domain and then reconstructing those in the time domain. In order to verify our method, we experimentally demonstrate that the same elliptically polarized terahertz waveform can be retrieved even when we use different EO crystals for detection. Although the terahertz E-field vector waveforms measured by different EO crystals are significantly different due to the distortions, the retrieved waveforms show a good agreement without need for additional corrections.",
author = "Kenichi Oguchi and Makoto Okano and Shinichi Watanabe",
year = "2017",
month = "9",
day = "1",
doi = "10.1364/JOSAB.34.001946",
language = "English",
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pages = "1946--1956",
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T1 - Retrieving the undistorted terahertz time-domain electric-field vector from the electro-optic effect

AU - Oguchi, Kenichi

AU - Okano, Makoto

AU - Watanabe, Shinichi

PY - 2017/9/1

Y1 - 2017/9/1

N2 - We formulate and experimentally demonstrate a method to retrieve the undistorted temporal profile of an elliptically polarized terahertz pulse from the electric-field (E-field) vector waveform detected by electro-optic (EO) sampling. This method takes into account the distortion effects due to pulse width of the probe laser, absorption by the EO crystal, and frequency-dependent phase mismatch between the probe and terahertz pulses inside the EO crystal. Even with this distortion, the detected elliptically polarized terahertz vector waveform can be simply interpreted as that at the center of the EO crystal for detection. This interpretation enables us to retrieve the undistorted terahertz E-field vector waveform in front of the EO crystal by analyzing the detected EO signals in the frequency domain and then reconstructing those in the time domain. In order to verify our method, we experimentally demonstrate that the same elliptically polarized terahertz waveform can be retrieved even when we use different EO crystals for detection. Although the terahertz E-field vector waveforms measured by different EO crystals are significantly different due to the distortions, the retrieved waveforms show a good agreement without need for additional corrections.

AB - We formulate and experimentally demonstrate a method to retrieve the undistorted temporal profile of an elliptically polarized terahertz pulse from the electric-field (E-field) vector waveform detected by electro-optic (EO) sampling. This method takes into account the distortion effects due to pulse width of the probe laser, absorption by the EO crystal, and frequency-dependent phase mismatch between the probe and terahertz pulses inside the EO crystal. Even with this distortion, the detected elliptically polarized terahertz vector waveform can be simply interpreted as that at the center of the EO crystal for detection. This interpretation enables us to retrieve the undistorted terahertz E-field vector waveform in front of the EO crystal by analyzing the detected EO signals in the frequency domain and then reconstructing those in the time domain. In order to verify our method, we experimentally demonstrate that the same elliptically polarized terahertz waveform can be retrieved even when we use different EO crystals for detection. Although the terahertz E-field vector waveforms measured by different EO crystals are significantly different due to the distortions, the retrieved waveforms show a good agreement without need for additional corrections.

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