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Producing ultrashort Terahertz to UV photons at high repetition rates for research into materials

Published online by Cambridge University Press:  01 February 2011

G. R. Neil ,
C. Behre ,
S. V. Benson ,
G. Biallas ,
J. Boyce ,
L. A. Dillon-Townes ,
D. Douglas ,
H. F. Dylla ,
R. Evans  and
A. Grippo
...Show all authors
G. R. Neil
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
C. Behre
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
S. V. Benson
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
G. Biallas
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
J. Boyce
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
L. A. Dillon-Townes
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
D. Douglas
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
H. F. Dylla
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
R. Evans
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
A. Grippo
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
D. Gruber
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
J. Gubeli
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
C. Hernandez-Garcia
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
K. Jordan
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
M. J. Kelley
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
L. Merminga
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
J. Mammosser
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
N. Nishimimori
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
J. Preble
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
R. Rimmer
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
M. Shinn
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
T. Siggins
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
R. Walker
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
G. P. Williams
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
S. Zhang
Affiliation:
Thomas Jefferson National Accelerator Facility Newport News VA 23606, USA
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Abstract

A new THz/IR/UV photon source at Jefferson Lab is the first of a new generation of light sources based on a Energy-Recovered, (superconducting) Linac (ERL). The machine has a 160 MeV electron beam and an average current of 10 mA in 75 MHz repetition rate hundred femtosecond bunches.

These electron bunches pass through a magnetic chicane and therefore emit synchrotron radiation. For wavelengths longer than the electron bunch the electrons radiate coherently a broadband THz ∼ half cycle pulse whose average brightness is > 5 orders of magnitude higher than synchrotron IR sources. Previous measurements showed 20 W of average power extracted[1]. The new facility offers simultaneous synchrotron light from the visible through the FIR along with broadband THz production of 100 fs pulses with >200 W of average power (see G. P. Williams, this conference).

The FELs also provide record-breaking laser power [2]: up to 10 kW of average power in the IR from 1 to 14 microns in 400 fs pulses at up to 74.85 MHz repetition rates and soon will produce similar pulses of 300–1000 nm light at up to 3 kW of average power from the UV FEL. These ultrashort pulses are ideal for maximizing the interaction with material surfaces. The optical beams are Gaussian with nearly perfect beam quality. See www.jlab.org/FEL for details of the operating characteristics; a wide variety of pulse train configurations are feasible from 10 microseconds long at high repetition rates to continuous operation.

The THz and IR system has been commissioned. The UV system is to follow in 2005. The light is transported to user laboratories for basic and applied research. Additional lasers synchronized to the FEL are also available. Past activities have included production of carbon nanotubes, studies of vibrational relaxation of interstitial hydrogen in silicon, pulsed laser vapor deposition, nitriding of metals, and energy flow in proteins. This paper will present the status of the system and discuss some of the opportunities provided by this unique light source for modifying and studying materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 850: Symposium MM – Ultrafast Lasers for Materials Science , 2004 , MM4.1
Copyright
Copyright © Materials Research Society 2005

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References

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