Inter-university Research Institute Corporation High Energy Accelerator Research Organization

High Energy Accelerator Research Organization

Inter-university Research Institute Corporation

Inter-university Research Corporation High Energy Accelerator Research Organization

Junji Urakawa

Yosuke Honda

Hirotaka Shimizu

Nobuhiro Terunuma

Toshikazu Takatomi

Kazuyuki Sakaue

The optical resonator as intends to generate coherent X-ray by irradiation of polarized laser interference fringes with electron beam has been unknown. The present invention provides an optical resonator that is capable of preparing polarization laser, polarization X-ray and coherent X-ray. The optical resonator is characterized by comprising an optical resonator that is capable of circulating two or more polarization lasers and irradiation of the polarization lasers with electron beam introduced by an electron beam feed port which is inserted in the intersection of laser paths inside the optical resonator.

Optical resonator

The present invention provides a burst-laser generator using an optical resonator which produces high pulse-strength of burst-laser in order to conduct laser Compton scattering, comprising: a self-oscillation amplifying optical loop-path and an external optical resonator to burst-amplify laser, wherein, laser supplied by an exciting laser source is self-oscillation amplified with the self-oscillation amplifying optical loop-path and further burst-amplified with the external optical resonator.

Burst-laser generator using an optical resonator

It has been very difficult to accumulate strong laser in the conventional optical resonator, because firstly it has been very difficult to control a resonator length less than 1 &#x212b; in resonation position which is required for the laser amplification more than 1,000 times and secondly, the conventional method has utilized laser strength of amplified laser in the optical resonator as the resonance control signal. The present invention provides an optical resonator system to accumulate strong laser. In the system, unamplified modulation wave or harmonic which are derived from oscillation laser are selectively used to tune a resonator length of the optical resonator.

Optical resonator system

A photocathode high-frequency electron-gun cavity apparatus of the present invention is provided with a high-frequency acceleration cavity (), a photocathode (), a laser entering port (), a high-frequency power input coupler port (), and a high-frequency resonant tuner (). Here, the apparatus adopts an ultra-small high-frequency accelerator cavity which contains a cavity cell formed only with a smooth and curved surface at an inner face thereof without having a sharp angle part for preventing discharging, obtaining higher strength of high-frequency electric field, and improving high-frequency resonance stability. Further, the photocathode is arranged at an end part of a half cell () of the high-frequency acceleration cavity for maximizing electric field strength at the photocathode face, perpendicular incidence of laser is ensured by arranging a laser entering port at a position facing to the photocathode behind an electron beam extraction port of the high-frequency acceleration cavity for maximizing quality of short-bunch photoelectrons, and a high-frequency power input coupler port is arranged at a side part of the cell of the high-frequency acceleration cavity for enhancing high-frequency electric field strength. According to the above, it is possible to provide a small photocathode high-frequency electron-gun cavity apparatus capable of generating a high-strength and high-quality electron beam.

Photocathode high-frequency electron-gun cavity apparatus

Provided is a laser oscillation apparatus capable of stabilizing resonance even when finesse of an optical resonator is increased and generating stronger laser light than that of a traditional apparatus by accumulating laser light in the optical resonator. The laser oscillation apparatus includes a laser light source which generates laser light for excitation, a fiber amplifier which generates laser light with a desired wavelength when the laser light generated at the laser light source for excitation is supplied, an optical resonator, an optical isolator which is interposed between the optical resonator and the fiber amplifier and which guides the laser light from the fiber amplifier to one side of the optical resonator while blocking laser light in the opposite direction, a circulation optical path which accelerates resonance as introducing laser light emitted from the other side of the optical resonator and returning the laser light to the optical resonator via the fiber amplifier and the optical isolator, and a modulator which performs amplitude modulation on the laser light in the circulation optical path.

Growing community of inventors

Tsukuba, Japan

Junji Urakawa