Beam splitting and reshaping device of frequency linear chirped pulses

Abstract

The invention discloses a beam splitting and reshaping device of frequency linear chirped pulses. The beam splitting and reshaping device of the frequency linear chirped pulses comprises a photorefractive crystal flat plate, multiplexing body holographic gratings and reshaping body holographic gratings, the multiplexing body holographic gratings are different in grating vector direction and identical in other characteristic parameters, the reshaping body holographic gratings are different in grating separation distance and identical in other characteristic parameters, the multiplexing body holographic gratings and the reshaping body holographic gratings are respectively placed behind all the chirped pulse laser to reshape the pulses. According to the beam splitting and reshaping device of the frequency linear chirped pulses, the multiplexing body holographic gratings and the reshaping body holographic gratings are integrated into a single-block photorefractive crystal flat plate, the structure is compact, performance is stable and reliable, the wavelength division multiplexing technology and the reshaping technology of the holographic gratings are combined in an organic mode, frequency shift and reshaping can be achieved for general chirped pulses and laser pulses, the beam splitting and reshaping device of the frequency linear chirped pulses is particularly suitable for a macro-energy high-power chirped pulse system.

Description

technical field [0001] The invention relates to the wavelength division multiplexing and shaping technology of volume holographic grating, more specifically, relates to a frequency linear chirped pulse beam splitting and shaping device. Background technique [0002] Ultrashort pulse laser has the characteristics of high time resolution and rich spectrum, and has been widely used in the fields of strong field physics, ultrafast imaging and laser spectroscopy. Due to the wide spectral characteristics, one can use optical dispersive elements such as prisms or gratings to shape chirped pulses. Volume holographic grating is a kind of diffractive optical element, which has high diffraction efficiency and large information capacity due to its advantages of optical parallel transmission and processing, interference-free cross transmission, three-dimensional beam propagation freedom, and multi-dimensional multiplexing of space and frequency. In addition to the attention paid to opti...

AI Technical Summary

Problems solved by technology

However, the ultrashort pulse laser in the prior art has a very wide frequency spectrum, and the convex lens will cause serious chromatic aberration, resulting in an unsatisfactory output pulse waveform

In addition, the damage threshold of the spatial light modulator is low, and the high-power ultrashort pulse incident will be damaged and the optical phase modulation cannot be performed. In addition, multiple separate optical elements are used in the experiment, which requires high precision of optical path adjustment and poor stability. These disadvantages limit the application of 4F structure

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