The FELI FEL facilities — challenges at simultaneous FEL beam sharing systems and UV-range FELs

Tomimasu, T.; Saeki, Kazuhiko; Miyauchi, Y.; Oshita, E.; Okuma, S.; Wakita, K.; Kobayashi, Akira; Suzuki, Toshiji; Zako, A.; Nishihara, Sadamitsu; Koga, A.; Wakisaka, Kenichiro; Tongu, Hiromu; Nagai, Akio; Yasumoto, M.

doi:10.1016/0168-9002(96)00097-6

Cited by 37 publications

(9 citation statements)

References 6 publications

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“…We could not tune the laser beam to a desired wavelength, because the wavelength of most lasers is determined by the type of laser media. 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].…”

Section: Introductionmentioning

confidence: 99%

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: 99%

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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“…and the taper function B u (z) is again given by Equation (18). As in the case of the flat-poleface model, Equation ( 19) is divergence free and the z-component of the curl also vanishes.…”

Section: Analytical Models For Static Magnetic Fieldsmentioning

confidence: 99%

“…in cylindrical coordinates r, θ, z, where χ = k u z − θ, I 1 is the regular Bessel function of the first kind, the prime ( ) indicates the derivative of the function with respect to its argument and B u (z) is again given by Equation (18). Finally, a magnetic field with varying degrees of ellipticity is produced by an APPLE-II undulator, which can be approximated by a superposition of two flat-pole-face undulators that are oriented perpendicularly to each other, and one of which can be displaced with respect to the other along the axis of symmetry.…”

Section: Analytical Models For Static Magnetic Fieldsmentioning

confidence: 99%

“…Copyright Springer, 2018. The unique properties of FEL oscillators, in particular to fill the spectral gap for coherent light sources in the visible to microwave spectral range, resulted quickly in the establishment of several facilities for applied research. The characteristics of user facilities using FEL oscillators depends, in part, on the accelerator technology used, which includes electrostatic acceleration [6][7][8][9], energy recovery linear accelerators (linacs) [10][11][12][13][14][15], nonrecovery linacs [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], microtrons [31,32] and synchrotrons [33][34][35][36][37]. Research performed at these user facilities includes, amongst others, biological and material science [38].…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional, Time-Dependent Analysis of High- and Low-Q Free-Electron Laser Oscillators

Slot

Freund

2021

Applied Sciences

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Free-electron lasers (FELs) have been designed to operate over virtually the entire electromagnetic spectrum, from microwaves through to X-rays, and in a variety of configurations, including amplifiers and oscillators. Oscillators can operate in both the low and high gain regime and are typically used to improve the spatial and temporal coherence of the light generated. We will discuss various FEL oscillators, ranging from systems with high-quality resonators combined with low-gain undulators, to systems with a low-quality resonator combined with a high-gain undulator line. The FEL gain code MINERVA and wavefront propagation code OPC are used to model the FEL interaction within the undulator and the propagation in the remainder of the oscillator, respectively. We will not only include experimental data for the various systems for comparison when available, but also present, for selected cases, how the two codes can be used to study the effect of mirror aberrations and thermal mirror deformation on FEL performance.

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“…A free electron laser (FEL) at Osaka University [2][3][4] can be continuously varied the mid-infrared wavelength range from 5.0 to 20.0 µm. The molecular vibration mode is concentrated in the mid-infrared range.…”

Section: Introductionmentioning

confidence: 99%

Thermal effect control for biomedical tissue by free electron laser

2007

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An absorption characteristic and a thermal relaxation time of a target biomedical tissue is an important parameter for development of low-invasive treatment that considers of interaction between biomedical tissue and laser. Laser irradiations with a wavelength corresponding to the absorption characteristics of tissue enable selective treatment. Furthermore, the thermal effect to tissue can be controlled at the laser irradiation time which depends on the laser pulse width and reception rate. A free electron laser (FEL) can continuously vary the wavelength in the mid-infrared region, has a unique pulse structure; the structure at the Institute of the Free Electron Laser (iFEL) consist of train of macropulses with a 15 µs pulse width, and each macropulse contained a train of 300-400 ultrashort micropulse with a 5 ps pulse width. In a previous report, we have proposed a novel laser treatment such as soft tissue cutting, dental treatment and laser angioplasty using the tenability of the FEL. To investigate the thermal effect to the biomedical tissue, we developed a FEL pulse control system using an acousto-optic modulator (AOM). The AOM commonly are used the Q-switch for the pulse laser generation, has a high pulse control efficiency and good operationally. The system can control the FEL macropulse width from 200 ns. This system should be a novel tool for investigating the interaction between the FEL and biomedical tissue. In this report, the interaction between FEL pulse width and biomedical tissue will be discussed.

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The FELI FEL facilities — challenges at simultaneous FEL beam sharing systems and UV-range FELs

Cited by 37 publications

References 6 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

Three-Dimensional, Time-Dependent Analysis of High- and Low-Q Free-Electron Laser Oscillators

Thermal effect control for biomedical tissue by free electron laser

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