Femtosecond photon storage ring based on chiral liquid crystal

Abstract

The invention discloses a femtosecond photon storage ring based on chiral liquid crystal used for Compton scattering to generate x ray. The storage ring light path is formed by the following steps: laser pulse is rotated by a polarizer and lambada / 4 wave plate to form circular polarization; beam expanding is carried out on the circular polarization; through injection light path, incident light enters into a cavity resonator by chiral liquid crystal coupling to focus on the focus point of confocal off-axis parabolic mirror so as to generation x ray through electron beam action, thus realizing that incident light is stored in the ring to carry out Compton scattering with electron beam at a high speed to generate x ray. The invention selects the chiral liquid crystal sheet as injection windowfor femtosecond photon cavity resonator, when used for Compton scattering, the brightness of the generated x ray can be improved by two orders, thus increasing coupling efficiency of the cavity resonator greatly and lowering attenuation loss of the cavity resonator. By adjusting liquid crystal thread pitch, the storage ring which is available of femtosecond laser pulse injection and transmissionfor each wave band is designed and can be real-time monitored and adjusted attenuation loss thereof at the same time.

Description

technical field [0001] The invention belongs to the technical field of ultrashort pulse laser X-rays, and in particular relates to a chiral liquid crystal-based femtosecond photon storage ring suitable for injection and transmission of ultrashort laser pulses and used for Compton scattering to generate high-brightness X-rays. Background technique [0002] As early as the 1960s, the idea of ​​electron beam scattering laser photons to generate X-rays was proposed. In the past ten years, due to the maturity of accelerator technology and the breakthrough development of TW lasers, this idea of ​​generating X-rays based on Compton scattering Become a new way to ultrashort pulse, high brightness, compact light source. However, limited by the low repetition rate of high-power lasers, the average brightness of X-rays produced by single scattering of laser beams and electron beams is not high. For this reason, it is proposed to store laser photons in the storage ring, and select the ...

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Problems solved by technology

However, this kind of storage ring is not suitable for high-energy femtosecond injection and transmission, because the high-power femtosecond laser pulse has a bandwidth of tens of nanometers, and the power of a femtosecond laser in the order of joules reaches several TW. Finally, the pulse width broadens seriously, which greatly reduces the peak power; and the phase delay increases sharply, causing beam splitting and self-focusing, which seriously damages optical components and beam quality

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