Multilayer body grating pulse laser shaping device and method

Abstract

The invention relates to multilayer grating pulse laser shaping device and method. The device comprises a multilayer grating, a polarizer and analyzers, wherein the multilayer grating is recorded into a holographic material and spatially spaced; the polarizer is placed in the incident direction of a pulse laser beam to be shaped; and the analyzers are respectively placed in the transmitting pulse laser beam direction and the diffraction pulse laser beam direction. By utilizing the diffraction action of the multilayer grating on the pulse laser beam to be shaped, the characteristic parameters such as layer number, thickness, grating period, and the like of the multilayer grating are properly adjusted to control the bandwidth and the waveform of the pulse laser beam. Compared with the prior art, the invention has wider shaping range on the input pulse laser beam and a plurality of characteristic parameters of the optional multilayer grating and is convenient for the optimization of a pulse filter shaping function.

Description

technical field [0001] The invention relates to pulse laser beam shaping, in particular to a multilayer volume grating pulse laser beam shaping device and method. Background technique [0002] With the development of pulsed laser beam generation technology, optical pulse shaping technology, as a supplementary means of pulsed laser beam generation, provides an unprecedented means of controlling laser pulse waveform for ultrafast spectroscopy, nonlinear optics and strong field physics and has been widely used. Research. People have developed a series of technical methods for optical waveform synthesis or pulse shaping. The prior art [1] (A.M.Weiner, J.P.Heritage, and E.M.Kirschner, "High resolution femtosecond pulse shaping," J.Opt.Soc.Am.B5, 1563-1572, 1988) uses time-domain Fourier transform, and its core It uses the template to perform parallel modulation on the frequency components dispersed in space, and finally achieves the purpose of pulse shaping. However, the templ...

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Problems solved by technology

However, the broadband polarization rotator used in the prior art is difficult to fabricate due to the many spectral components contained in the ultrashort pulse, and the diffraction efficiency of the volume grating on the input pulse of certain polarization states will be very low, which limits the application of the pulse shaping device. application

In addition, a single volume holographic grating is used in the prior art, and the grating parameters that can be adjusted are few

These shortcomings undoubtedly limit the application and development of volume holographic gratings to pulse laser shaping technology, so we need to develop a laser pulse shaping method and device with high diffraction efficiency and multi-degree-of-freedom grating parameter adjustment

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