Medium laser accelerator, vertical cavity surface laser and preparation method of vertical cavity surface laser

Abstract

The invention relates to a medium laser accelerator and a vertical cavity surface laser. An XYZ space rectangular coordinate system is defined. The medium laser accelerator comprises a vertical cavity surface laser, the vertical cavity surface laser comprising an active layer and an acceleration area arranged in front of the Z-axis direction of the active layer, the main extension plane of the active layer being parallel to the plane defined by the X axis and the Y axis, and the acceleration region being provided with an acceleration channel parallel to the X-axis direction; a reflecting mirror, arranged on a light path of the laser emitted by the vertical cavity surface laser and used for reflecting the laser emitted by the vertical cavity surface laser at a specific angle; and a saturable absorption mirror, having corresponding absorptivity for the laser with different light intensities reflected by the reflecting mirror, and can compress the pulse width of the laser and reflect the compressed laser back to the vertical cavity surface laser through the reflecting mirror. A higher accelerating electric field can be obtained in an accelerating area, and the accelerating gradient of the medium laser accelerator is improved.

Description

technical field [0001] The invention relates to a laser accelerator, in particular to a dielectric laser accelerator, a vertical cavity surface laser and a preparation method thereof. Background technique [0002] Particle accelerators are one of the important tools for human beings to explore the microcosm. At present, more than 200 large-scale accelerator devices have been built around the world. They have made exciting achievements in many fields such as life sciences, chemical materials, high-energy physics, national defense technology, and medical care the results. Accelerator devices generally have the problems of long production cycle and high cost. Take other accelerator devices that produce hard X-rays as an example. The total budget is usually more than 1 billion US dollars, and the size of the device is measured in kilometers. The huge size and high construction cost limit the accelerator's application to a wider range of basic science and industry. Therefore, ...

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Problems solved by technology

[0006] According to relevant literature reports, edge-emitting semiconductor lasers can achieve short-pulse laser lasing of nearly 200mW, but due to their long cavity length and high noise level, an external semiconductor amplifier or resonator is required to achieve higher power short-pulse lasers. Cavity

Therefore, for an edge-emitting dielectric laser accelerator, although the dielectric material used in its acceleration region has a very high breakdown threshold, it is limited by the laser power of the semiconductor laser itself. The electric field strength is small, it is difficult to obtain a higher acceleration gradient

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