THE DISCRETE NATURE OF THE COHERENT SYNCHROTRON RADIATION

Mouret, Gaﾑl

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https://hdl.handle.net/2142/79100 Copy

Description

Title

THE DISCRETE NATURE OF THE COHERENT SYNCHROTRON RADIATION

Author(s)

Mouret, Gaﾑl

Contributor(s)

• Hindle, Francis
• Cuisset, Arnaud
• DUCOURNEAU, Gaﾑl
• LAMPIN, Jean Franﾍois
• Roy, P.
• Pirali, Olivier
• Tammaro, Stefano

Issue Date

23-Jun-15

Keyword(s)

Mini-symposium: Accelerator-Based Spectroscopy

Abstract

Frequency Combs (FC) have radically changed the landscape of frequency metrology and high-resolution spectroscopy investigations extending tremendously the achievable resolution while increasing signal to noise ratio. Initially developed in the visible and near-IR spectral regions footnote{Udem, Th., Holzwarth, H., Hﾊnsch, T. W., Optical frequency metrology. Nature 416, 233-237 (2002)}, the use of FC has been expanded to mid-IR footnote{Schliesser, A., Picquﾎ, N., Hﾊnsch, T. W., Mid-infrared frequency combs. Nature Photon. 6, 440 (2012)}, extreme ultra-violet footnote{Zinkstok, R. Th., Witte, S., Ubachs, W., Hogervorst, W., Eikema, K. S. E., Frequency comb laser spectroscopy in the vacuum-ultraviolet region. Physical Review A 73, 061801 (2006)} and X-ray footnote{Cavaletto, S. M. et al. Broadband high-resolution X-ray frequency combs. Nature Photon. 8, 520-523 (2014)}. Significant effort is presently dedicated to the generation of FC at THz frequencies. One solution based on converting a stabilized optical frequency comb using a photoconductive terahertz emitter, remains hampered by the low available THz power footnote{Tani, M., Matsuura, S., Sakai, K., Nakashima, S. I., Emission characteristics of photoconductive antennas based on low-temperature-grown GaAs and semi-insulating GaAs. Applied Optics 36, 7853-7859 (1997)}. Another approach is based on active mode locked THz quantum-cascade-lasers providing intense FC over a relatively limited spectral extension footnote{Burghoff, D. et al. Terahertz laser frequency combs. Nature Photon. 8, 462-467 (2014)} . Alternatively, we show that dense powerful THz FC is generated over one decade of frequency by coherent synchrotron radiation (CSR). In this mode, the entire ring behaves in a similar fashion to a THz resonator wherein electron bunches emit powerful THz pulses quasi-synchronously. The observed FC has been fully characterized and is demonstrated to be offset free. Based on these recorded specifications and a complete review of existing THz frequency comb, a special attention will be paid onto similarities and differences between them.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79100

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