Optical property of infrared-FELs at the FELI

Kobayashi, Akira; Saeki, Kazuhiko; Oshita, E.; Okuma, S.; Wakita, K.; Zako, A.; Koga, A.; Miyauchi, Y.; Nagai, Akio; Yasumoto, M.; Tomimasu, T.

doi:10.1016/0168-9002(95)01211-7

Cited by 34 publications

(3 citation statements)

References 4 publications

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“…The free-electron laser (FEL) is unique, because this laser beam is broadly tunable [1]. At the FreeElectron Laser Research Institute, we have developed an FEL system in which the wavelength may be adjusted to any desired value, ranging from 350 nm to 40 m [2,3]. We report here the results of experiments in which the FEL was tuned to 5.75 m, a wavelength that corresponds to the stretch mode of the ester bonds.…”

Section: Introductionmentioning

confidence: 96%

Selective removal of cholesterol esters in an arteriosclerotic region of blood vessels with a free-electron laser

Awazu

Nagai

Aizawa³

1998

Lasers Surg. Med.

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Section: Introductionmentioning

confidence: 96%

Selective removal of cholesterol esters in an arteriosclerotic region of blood vessels with a free-electron laser

Awazu

Nagai

Aizawa³

1998

Lasers Surg. Med.

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“…To compare decrease efficiency among the three wavelengths which do not dependon the parameter expect of the wavelength, we consitr the quantum yield for crease of ester, , which &scribes the probability of dissociation or ablation of ester per The differential equations describing the decrease of ester is: dC/dt=Ck (2) where C [rim] is the amount of cholesteryl oleate in the thickness of the cholesteryl oleate sample film. if the sample film involves dissociated ester such as aldehyde, carboxylic acid or ketone, C is smaller than the thickness of the film in fact.…”

Section: Decrease In the Amount Of Bondsmentioning

confidence: 99%

Infrared free-electron-laser ablation of cholesterol esters in an arteriosclerotic region

Awazu

Fukami

1999

Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems IX

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Successful removal of cholesterol ester which is specifically accumulated in the arteriosclerotic region on the arterial walls was achieved by the exposure of5.75tm-infraredfree-electron-1asers (FEL) which is absorbed by C=O stretching vibrations of ester. In this study, chemical bond-changes and decrease in amount of cholesteryl oleate in IRFEL photodynamic processes were examined by Fourier transform infrared microspectroscopy (FT-IR). Wefound that the exposure of 5.75tm-FELs induces not only dissociation of ester (RCOOR') bonds but also the oxidation process of the ester (RCOOR') bonds to aldehyde(RCHO), carboxylic acid (RCOOH), carboxylate (RCOO) or ketone (R2C=O) bonds. Further, we exposed cholesteryl oleate to FELs having wavelength of5.75tm, 9.4ORm and8.44tm. From changes in absorbance andthickness of the samples, we calculated quantum efficiency 1 for decrease of ester bonds and C-C chains for each wavelength-EEL exposure. 1 was obtained to be 2.1x104 forester bondand 1.2x1Ofor C-Cchainby 5.75.tm-FELs,O.9x1O and2.0x104 by 9.4Otm-FELs, and 1.2x104 and 1 .0x104 by 8.44m-FELs. Thus, we canconcludethat removal ofcholesteryl oleate by IR-FELs has the wavelength sensitivity coming from correspondence between the bonds which absorbs FEL photons and which aimed to remove.

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“…[19,20] The FEL has a specific characteristic for a laser system in that we can obtain a highly tuned pulsed laser beam with a variety of wavelengths from ultraviolet to far-infrared (0.3±20 lm).…”

mentioning

confidence: 99%

Change of Liquid-Crystal Domains by Vibrational Excitation for a Columnar Mesophase

Monobe¹,

Awazu

Shimizu³

2000

Adv. Mater.

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Molecular alignment of liquid crystals using infrared light is presented as a viable alternative to UV‐vis irradiation. In this technique, a free electron laser (FEL) is used to vibrationally excite the columnar mesophase of the triphenylene‐based discotic liquid crystal HHOT. Upon FEL irradiation the microscopic texture of the HHOT film changes (see Figure), associated with a change in the alignment of the columns.

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Optical property of infrared-FELs at the FELI

Cited by 34 publications

References 4 publications

Selective removal of cholesterol esters in an arteriosclerotic region of blood vessels with a free-electron laser

Selective removal of cholesterol esters in an arteriosclerotic region of blood vessels with a free-electron laser

Infrared free-electron-laser ablation of cholesterol esters in an arteriosclerotic region

Change of Liquid-Crystal Domains by Vibrational Excitation for a Columnar Mesophase

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