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Free-electron lasers and masers on curved paths
The possibility of building free-electron lasers and masers with quasi-circular undulators is considered. The two-mirror cavity is replaced by a suitable waveguide. The magnetic field along the orbit has a con...
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Article
Coherent radiation from electrons in transverse periodic fields
The coherent radiation from a relativistic electron beam in transverse, plane-polarized, spatially periodic magnetic fields is calculated by taking into account anharmonic effects. Coherent radiation is interp...
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Article
The converter and the transverse optical klystron
In this paper we present a survey of the classical theory of the coherent emission of radiation in the optical and submillimetre range from a relativistic electron beam in a transverse, plane-polarized, spatia...
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Article
Angular-spread effect in a free-electron laser with a nonmonoenergetic beam
We perform analytically the calculation of the small signal gain for a free-electron laser with an electron beam having both energy and angular spread. We obtain that the gain is substantially reduced by the p...
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Article
Small-signal gain of Free Electron Laser in a resonator Gaussian mode
We present an analytical expression for the small-signal gain of a Free Electron Laser (FEL) in the presence of a Gaussian mode. To describe the electron beam evolution we use the one-dimensional (1-d) Vlasov ...
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Article
Inhomogeneous broadening effects in Optical Klystrons operating with accelerating devices without radiative dam**
In this letter paper we analyse the effect of electron-beam qualities (namely, energy spread and emittances) on both spontaneous emission and gain of an Optical Klystron (OK).
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Article
A high power CH3OH FIR laser system with long-term stability
A CH3OH FIR system has been developed for plasma diagnostics. A CO2 laser devoted to pump the CH3OH molecule has been studied. Different internal diameters of FIR cavity, input coupling holes and focusing lenses ...
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Article
RF cavity for gas laser excitation
A new technique for RF transverse excitation of gas laser has been tested: the plasma tube has been put inside a quarter wave strip line RF cavity. Excellent field uniformity and arcing problem avoidance have ...
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Article
The power dependence of a carbon-dioxide laser on the gas flow
The gas flow rate has resulted very important to get high power in a CO2 diffusion-cooled laser. Some measurements suggest that the power dependence on the flow is connected with the chemical dissociation of the ...
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Article
A 0.2kW single-line-single-mode stable CO2 laser
The performance of a high-power CO2 laser for optical pum** is presented. Different operation conditions have been tested: internal and external optics, different reflectors and irides, different gas flow rates...
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Article
Design of a continuous-wave free-electron laser experiment using an electrostatic accelerator with very high recovery efficiency of the electron beam
In this paper the free-electron laser (FEL) experiment SEAFEL in progress at the Legnaro (Padova) INFN laboratory is presented. The accelerator characteristics and FEL parameters are discussed. The laser could...
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Article
A tunable bragg cavity for an efficient millimeter FEL driven by electrostatic accelerators
A comparison between three possible cavity configurations, the confocal cavity, the ring cavity and the Bragg cavity is presented for a millimeter FEL set within the high voltage head of an electrostatic accel...
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Article
Photoemission from diamond films illuminated by intense Nd:YAG laser harmonics
Photoemission from polycrystalline diamond films irradiated with the harmonics of a Nd:YAG laser indicates that the amorphous or quasi-amorphous zones (patches) of sp2-C on the external surface of the diamond gra...
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Article
Rectangular pulse formation in a laser harmonic generation
In a harmonic generation process the temporal profile of the up-converted pulse undergoes significative changes depending on the input profile and crystal length. A simple theoretical treatment and the corresp...
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Article
Late Surfactant Therapy for Postsurfactant Slump in Extremely Low Birth Weight Infants
Aim: To evaluate late suine surfactant therapy for the pulmonary disease in extremely low birth weight infants (ELBW).