THz Spectroscopy with a Holographic Fourier Transform Spectrometer Plus Array Detector Using Coherent Synchrotron Radiation (PREPRINT)
Abstract
Using coherent THz synchrotron radiation, a holographic Fourier transform spectrometer coupled to an array detector was tested experimentally to determine its viability as a spectral device. Somewhat surprisingly, the overall performance strongly depends on the absorptivity of the birefringent lithium tantalate pixels in the array detector. With the development of coherent broadband THz synchrotron sources based on the radiation produced by short bunches of electrons in storage rings, interest has developed in the appropriate spectroscopic instrumentation for bunch length measurements, which correspond to the sub-picosecond time-scale. In addition to single shot spectroscopy measurements, there is also interest in using this mm and submillimeter coherent wave radiation signature from the bunch for its structural analysis. Spectroscopic measurement of the bunch length by means of its coherent radiation signature becomes technically easier as the bunch gets shorter in length since the resulting radiation extends over a larger frequency interval. The determination of the bunch form factor using this technique has been described in some detail. A candidate instrument for the types of study just outlined is a holographic Fourier transform spectrometer (HFTS), which has no moving parts and produces an interferogram in the spatial, but not in the time domain. Thanks to its high throughput, HFTS have found use in the remote and time-dependent sensing areas, where they outperform even multichannel spectrographs.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 14, 2010
- Accession Number
- ADA522769
Entities
People
- A. J. Sievers
- G. P. Williams
- J. M. Klopf
- N. I. Agladze
Organizations
- Cornell Laboratory of Atomic and Solid State Physics