Wide band high-gain generating magnifier

Abstract

A regeneration amplifier of wideband and high gain is prepared as setting the first polarization plate ,Puckerl box, the second polarization plate ,dispersion element (DE)and gain media in sequence along light axle in resonant cavity ; Setting the first and the and the second horizontal direction of focusing column lens, the first and the second vertical direction of focusing column lens, the first and the second pumping total reflector separately at two sides of said resonant cavity to regulate energy distribution of gain media pumping light to adapt to spectrum composition of DE separation seed light for making amplification multiplying power of gain media to different spectrum composition be identical.

Description

technical field [0001] The invention relates to a femtosecond laser, which is a broadband high-gain regenerative amplifier applied to a femtosecond laser, which belongs to femtosecond pulse amplification, and is characterized in that it uses a dispersion element to achieve separate amplification of different spectral components, and has a wide gain bandwidth and high amplification. The advantage of high efficiency. Background technique [0002] In recent years, the development of chirped pulse amplification technology (hereinafter referred to as CPA) has successfully provided human beings with pulse widths on the femtosecond level (10 -15 s), peak power up to terawatts (10 12 W) or even petawatts (10 15 W) level ultra-short laser pulse, its focused ultra-high intensity (10 18 W / cm 2 ) has a very wide range of applications in fields such as electron acceleration. The basic idea of ​​CPA is to stretch the ultrashort pulse of femtosecond level to hundreds of picoseconds (1...

AI Technical Summary

Problems solved by technology

[0007] First, these methods cannot arbitrarily control the loss curves of different spectral components, so they can only compensate for the gain-narrowing effect within a limited bandwidth

[0008] Second, due to the introduction of loss devices in the cavity, the efficiency and stability of the regenerative amplifier are reduced

[0009] Third, they also have their own weaknesses

The etalon 7 has very strict requirements on the thickness, so it is difficult to process and expensive; when the prism pair 8 is used to control the loss, the spatial mask (Spatial Mask) will intercept a part of the spectrum 100%, which will cause a serious loss of spectral components output by the regenerative amplifier and discontinuity; in addition, the etalon 7 and the birefringence filter 9 have very strict requirements on the angle, so a slight change of the device in the regenerative cavity will destroy the output spectrum of the regenerative amplifier, and the resonant cavity is easy to be out of tune.

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