Coherent synchrotron radiation for broadband terahertz spectroscopy

2013 ◽  
Vol 84 (3) ◽  
pp. 033102 ◽  
Author(s):  
J. Barros ◽  
C. Evain ◽  
L. Manceron ◽  
J.-B. Brubach ◽  
M.-A. Tordeux ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Terahertz Spectroscopy ◽  
Coherent Synchrotron Radiation ◽  
Broadband Terahertz

scholarly journals Longitudinal bunch dynamics study with coherent synchrotron radiation

2016 ◽  
Vol 19 (2) ◽  
Author(s):  
B. E. Billinghurst ◽  
J. C. Bergstrom ◽  
C. Baribeau ◽  
T. Batten ◽  
T. E. May ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Coherent Synchrotron Radiation

scholarly journals Optoelectronic frequency-modulated continuous-wave terahertz spectroscopy with 4 THz bandwidth

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Lars Liebermeister ◽  
Simon Nellen ◽  
Robert B. Kohlhaas ◽  
Sebastian Lauck ◽  
Milan Deumer ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Continuous Wave ◽  
Dynamic Range ◽  
Terahertz Spectroscopy ◽  
Beat Signal ◽  
Photonic Integration ◽  
Terahertz Time Domain Spectroscopy ◽  
Destructive Testing ◽  
Optical Delay ◽  
Broadband Terahertz

AbstractBroadband terahertz spectroscopy enables many promising applications in science and industry alike. However, the complexity of existing terahertz systems has as yet prevented the breakthrough of this technology. In particular, established terahertz time-domain spectroscopy (TDS) schemes rely on complex femtosecond lasers and optical delay lines. Here, we present a method for optoelectronic, frequency-modulated continuous-wave (FMCW) terahertz sensing, which is a powerful tool for broadband spectroscopy and industrial non-destructive testing. In our method, a frequency-swept optical beat signal generates the terahertz field, which is then coherently detected by photomixing, employing a time-delayed copy of the same beat signal. Consequently, the receiver current is inherently phase-modulated without additional modulator. Owing to this technique, our broadband terahertz spectrometer performs (200 Hz measurement rate, or 4 THz bandwidth and 117 dB peak dynamic range with averaging) comparably to state-of-the-art terahertz-TDS systems, yet with significantly reduced complexity. Thickness measurements of multilayer dielectric samples with layer-thicknesses down to 23 µm show its potential for real-world applications. Within only 0.2 s measurement time, an uncertainty of less than 2 % is achieved, the highest accuracy reported with continuous-wave terahertz spectroscopy. Hence, the optoelectronic FMCW approach paves the way towards broadband and compact terahertz spectrometers that combine fiber optics and photonic integration technologies.

Broadband THz high-resolution interferometry using coherent synchrotron radiation

2012 ◽  
Author(s):  
J. Barros ◽  
L. Manceron ◽  
J.-B. Brubach ◽  
C. Evain ◽  
M.-E. Couprie ◽  
...  
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Coherent Synchrotron Radiation

scholarly journals Terahertz Spectroscopy of Novel Superconductors

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Stefano Lupi
Keyword(s):  
Synchrotron Radiation ◽  
Fermi Energy ◽  
Terahertz Spectroscopy ◽  
Signal To Noise Ratio ◽  
Spectroscopic Technique ◽  
Signal To Noise ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Reflectivity Spectra ◽  
Michelson Interferometry

Through the coupling of Synchrotron Radiation and Michelson interferometry, one may obtain in the terahertz (THz) range transmittance and reflectivity spectra with a signal-to-noise ratio (S/N) up to 103. In this paper we review the application of this spectroscopic technique to novel superconductors with an increasing degree of complexity: the single-gap boron-doped diamond; the isotropic multiband V3Si, where superconductivity opens two gaps at the Fermi energy; the CaAlSi superconductor, isostructural to MgB2, with a single gap in the hexagonal ab plane and two gaps along the orthogonalcaxis.

scholarly journals Coherent synchrotron radiation free longitudinal bunch shaping using transverse deflecting cavities

2020 ◽  
Vol 23 (7) ◽  
Author(s):  
Gwanghui Ha ◽  
John G. Power ◽  
Jiahang Shao ◽  
Manoel Conde ◽  
Chunguang Jing
Keyword(s):  
Synchrotron Radiation ◽  
Coherent Synchrotron Radiation
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