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Design, Construction, and Applications of a High-Resolution Terahertz Time-Domain Spectrometer


Holland, Daniel Brian (2014) Design, Construction, and Applications of a High-Resolution Terahertz Time-Domain Spectrometer. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z91J97QR.


This thesis reports on the design, construction, and initial applications of a high-resolution terahertz time-domain ASOPS spectrometer. The instrument employs asynchronous optical sampling (ASOPS) between two Ti:sapphire ultrafast lasers operating at a repetition rate of approximately 80 MHz, and we thus demonstrate a THz frequency resolution approaching the limit of that repetition rate. This is an order of magnitude improvement in resolution over typical THz time-domain spectrometers. The improved resolution is important for our primary effort of collecting THz spectra for far-infrared astronomy. We report on various spectroscopic applications including the THz rotational spectrum of water, where we achieve a mean frequency error, relative to established line centers, of 27.0 MHz. We also demonstrate application of the THz system to the long-duration observation of a coherent magnon mode in a anti-ferromagnetic yttrium iron oxide (YFeO3) crystal. Furthermore, we apply the all-optical virtual delay line of ASOPS to a transient thermoreflectance experiment for quickly measuring the thermal conductivity of semiconductors.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:THz;spectroscopy;water;phonon;ASOPS;thermal conductivity
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Blake, Geoffrey A.
Group:Astronomy Department
Thesis Committee:
  • Heath, James R. (chair)
  • Beauchamp, Jesse L.
  • Rees, Douglas C.
  • Blake, Geoffrey A.
Defense Date:18 April 2014
Record Number:CaltechTHESIS:04222014-120506633
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8197
Deposited By: Daniel Holland
Deposited On:19 Sep 2016 23:43
Last Modified:08 Nov 2023 00:16

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