scholarly journals Hybrid (Oscillator-Amplifier) Free Electron Laser and New Proposals

2021 ◽  
Vol 11 (13) ◽  
pp. 5948
Author(s):  
Andrea Doria
Keyword(s):  
Electric Field ◽  
Free Electron ◽  
Free Electron Laser ◽  
Radiation Source ◽  
Far Infrared ◽  
Infrared Region ◽  
Transverse Magnetic ◽  
Radiation Emission ◽  
Magnetic Undulator ◽  
Strong Radiation

The present work analyses a hybrid free electron laser (FEL) scheme where the oscillator is based on a radiation source operating with a slow-wave guiding structure as, for instance, a Cerenkov FEL or a Smith–Purcell FEL. Such devices, often running in transverse magnetic (TM) modes, present a longitudinal electric field which can easily affect the longitudinal electrons’ velocities, inducing an energy modulation on the beam. Such a modulation, properly controlled, can induce a strong radiation emission in a magnetic undulator properly designed to operate as a radiator. General considerations will be exposed together with a practical numerical example in the far infrared region of the spectrum.

Application of mid-infrared free-electron laser for structural analysis of biological materials

2021 ◽  
Vol 28 (1) ◽  
pp. 28-35
Author(s):  
Takayasu Kawasaki ◽  
Heishun Zen ◽  
Kento Ozaki ◽  
Hironari Yamada ◽  
Kazumasa Wakamatsu ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Free Electron ◽  
Free Electron Laser ◽  
Structural Changes ◽  
Far Infrared ◽  
Biological Materials ◽  
Infrared Region ◽  
Photon Absorption ◽  
Mid Infrared ◽  
Structural Evaluation

A mid-infrared free-electron laser (MIR-FEL) is a synchrotron-radiation-based femto- to pico-second pulse laser. It has unique characteristics such as variable wavelengths in the infrared region and an intense pulse energy. So far, MIR-FELs have been utilized to perform multi-photon absorption reactions against various gas molecules and protein aggregates in physical chemistry and biomedical fields. However, the applicability of MIR-FELs for the structural analysis of solid materials is not well recognized in the analytical field. In the current study, an MIR-FEL is applied for the first time to analyse the internal structure of biological materials by using fossilized inks from cephalopods as the model sample. Two kinds of fossilized inks that were collected from different strata were irradiated at the dry state by tuning the oscillation wavelengths of the MIR-FEL to the phosphoryl stretching mode of hydroxyapatite (9.6 µm) and to the carbonyl stretching mode of melanin (5.8 µm), and the subsequent structural changes in those materials were observed by using infrared microscopy and far-infrared spectroscopy. The structural variation of these biological fossils is discussed based on the infrared-absorption spectral changes that were enhanced by the MIR-FEL irradiation, and the potential use of MIR-FELs for the structural evaluation of biomaterials is suggested.

FAR INFRARED FREE ELECTRON LASER

1983 ◽  
Vol 44 (C1) ◽  
pp. C1-385-C1-385
Author(s):  
E. D. Shaw ◽  
R. M. Emanuelson ◽  
G. A. Herbster
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Far Infrared

scholarly journals All-optical single shot complete electric field measurement of extreme ultraviolet free electron laser pulses

Optica ◽  
2021 ◽  
Author(s):  
William Peters ◽  
Travis Jones ◽  
Anatoly Efimov ◽  
Emanuele Pedersoli ◽  
Laura Foglia ◽  
...  
Keyword(s):  
Electric Field ◽  
Free Electron ◽  
Field Measurement ◽  
Free Electron Laser ◽  
Extreme Ultraviolet ◽  
Laser Pulses ◽  
Single Shot ◽  
Electric Field Measurement ◽  
All Optical

Design and construction of a far-infrared free-electron laser driven by a microtron

1998 ◽  
pp. 161-166
Author(s):  
Jongmin Lee ◽  
Byung Cheol Lee ◽  
Young Uk Jeong ◽  
Sung Oh Cho ◽  
Sun Kook Kim ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Far Infrared ◽  
Design And Construction

Ablation of Teflon Granuloma with the Free-Electron Laser Emitting in the Eight- to Nine-Micron Range

1998 ◽  
Vol 107 (4) ◽  
pp. 269-274 ◽  
Author(s):  
Grady Lee Bryant ◽  
Charles F. Lano ◽  
Lou Reinisch ◽  
Robert H. Ossoff ◽  
Jay A. Werkhaven
Keyword(s):  
Absorption Spectrum ◽  
Free Electron ◽  
Free Electron Laser ◽  
Infrared Absorption Spectrum ◽  
Infrared Region ◽  
Surrounding Tissue ◽  
Endoscopic Injection ◽  
Maximal Absorption ◽  
Teflon Granuloma ◽  
Laser Incision

In this study, we developed a rat model for Teflon granuloma and used this model to evaluate the removal of the granuloma at laser wavelengths at which Teflon has a maximal absorption. Twenty-four Teflon granulomas were created in 12 rats, and the gross and histologic effects from laser incision at four different wavelengths (8.25, 8.5, 8.75, and 10.6 Jim) were evaluated acutely and at 7 and 14 days postoperatively. Polytetrafluoroethylene, or Teflon, is a relatively inert substance that has been used over the past 4 decades for endoscopic injection into the thyroarytenoid muscle of the larynx for the purposes of laryngeal rehabilitation in cases of unilateral vocal fold paralysis or incomplete glottic closure. In certain cases in which formation of granulomatous reaction to the Teflon occurs, patients may have significant dysphonia or airway compromise. Once Teflon has infiltrated the surrounding tissue planes, it is exceedingly difficult to remove endoscopically. Endoscopic removal of this granuloma is usually attempted with the carbon dioxide (CO2) laser and has had limited success. Examination of the infrared absorption spectrum of polytetrafluoroethylene reveals strong absorption in the mid-infrared region in the 8- to 9-μm range, with minimal absorption at 10.6 μm. Therefore, this absorption spectrum predicts a more efficient vaporization of Teflon at wavelengths near 8.5 μm. Using the free-electron laser to generate 8.25-, 8.5-, and 8.75-μm laser light, we found Teflon granuloma ablation was far superior to CO2 laser ablation at 10.6 μm. The 8.25-, 8.5-, and 8.75-μm wavelengths selectively ablated Teflon granuloma with minimal to no collateral thermal injury to tissue. The differences in thermal effects observed while actually using the lasers were confirmed histologically.

The Radiation Beamline of Novosibirsk Free-Electron Laser Facility Operating in Terahertz, Far-Infrared, and Mid-Infrared Ranges

2020 ◽  
Vol 10 (6) ◽  
pp. 634-646
Author(s):  
Vitaly V. Kubarev ◽  
Gennady I. Sozinov ◽  
Mikhail A. Scheglov ◽  
Alexander V. Vodopyanov ◽  
Alexander V. Sidorov ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Far Infrared ◽  
Mid Infrared ◽  
Laser Facility
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