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Title: Invited Article: Single-shot THz detection techniques optimized for multidimensional THz spectroscopy

Abstract

Multidimensional spectroscopy at visible and infrared frequencies has opened a window into the transfer of energy and quantum coherences at ultrafast time scales. For these measurements to be performed in a manageable amount of time, one spectral axis is typically recorded in a single laser shot. An analogous rapid-scanning capability for THz measurements will unlock the multidimensional toolkit in this frequency range. Here, we first review the merits of existing single-shot THz schemes and discuss their potential in multidimensional THz spectroscopy. We then introduce improved experimental designs and noise suppression techniques for the two most promising methods: frequency-to-time encoding with linear spectral interferometry and angle-to-time encoding with dual echelons. Both methods, each using electro-optic detection in the linear regime, were able to reproduce the THz temporal waveform acquired with a traditional scanning delay line. Although spectral interferometry had mediocre performance in terms of signal-to-noise, the dual echelon method was easily implemented and achieved the same level of signal-to-noise as the scanning delay line in only 4.5% of the laser pulses otherwise required (or 22 times faster). This reduction in acquisition time will compress day-long scans to hours and hence provides a practical technique for multidimensional THz measurements.

Authors:
; ; ;  [1]
  1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22392486
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DESIGN; DETECTION; INTERFEROMETRY; LASERS; NOISE; PERFORMANCE; PULSES; REDUCTION; SIGNALS; SPECTROSCOPY

Citation Formats

Teo, Stephanie M., Ofori-Okai, Benjamin K., Werley, Christopher A., and Nelson, Keith A., E-mail: kanelson@mit.edu. Invited Article: Single-shot THz detection techniques optimized for multidimensional THz spectroscopy. United States: N. p., 2015. Web. doi:10.1063/1.4921389.
Teo, Stephanie M., Ofori-Okai, Benjamin K., Werley, Christopher A., & Nelson, Keith A., E-mail: kanelson@mit.edu. Invited Article: Single-shot THz detection techniques optimized for multidimensional THz spectroscopy. United States. doi:10.1063/1.4921389.
Teo, Stephanie M., Ofori-Okai, Benjamin K., Werley, Christopher A., and Nelson, Keith A., E-mail: kanelson@mit.edu. Fri . "Invited Article: Single-shot THz detection techniques optimized for multidimensional THz spectroscopy". United States. doi:10.1063/1.4921389.
@article{osti_22392486,
title = {Invited Article: Single-shot THz detection techniques optimized for multidimensional THz spectroscopy},
author = {Teo, Stephanie M. and Ofori-Okai, Benjamin K. and Werley, Christopher A. and Nelson, Keith A., E-mail: kanelson@mit.edu},
abstractNote = {Multidimensional spectroscopy at visible and infrared frequencies has opened a window into the transfer of energy and quantum coherences at ultrafast time scales. For these measurements to be performed in a manageable amount of time, one spectral axis is typically recorded in a single laser shot. An analogous rapid-scanning capability for THz measurements will unlock the multidimensional toolkit in this frequency range. Here, we first review the merits of existing single-shot THz schemes and discuss their potential in multidimensional THz spectroscopy. We then introduce improved experimental designs and noise suppression techniques for the two most promising methods: frequency-to-time encoding with linear spectral interferometry and angle-to-time encoding with dual echelons. Both methods, each using electro-optic detection in the linear regime, were able to reproduce the THz temporal waveform acquired with a traditional scanning delay line. Although spectral interferometry had mediocre performance in terms of signal-to-noise, the dual echelon method was easily implemented and achieved the same level of signal-to-noise as the scanning delay line in only 4.5% of the laser pulses otherwise required (or 22 times faster). This reduction in acquisition time will compress day-long scans to hours and hence provides a practical technique for multidimensional THz measurements.},
doi = {10.1063/1.4921389},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 5,
volume = 86,
place = {United States},
year = {2015},
month = {5}
}