Optical pulse regulation and control method and system based on multi-frequency acousto-optic modulation and grating diffraction

Abstract

The invention belongs to the technical field of pulse laser regulation and control, and particularly relates to an optical pulse regulation and control method and system based on multi-frequency acousto-optic modulation and grating diffraction. The method comprises: conducting multi-angle Bragg deflection on pulsed light input through multi-frequency acousto-optic modulation, so that the pulsed light is propagated in parallel along a plurality of delay lines, reverse diffraction is achieved on all the delay lines at the same time through a large-area optical grating, the pulsed light passes through an acousto-optic modulator again, and finally forming shaping light pulses output in a single space mode. The amplitude, phase and delay of sub-pulses are controlled through radio frequency signal programming, and coherent optical waveforms with near-terahertz modulation bandwidth and stable waveforms can be generated and used for accurately regulating and controlling atomic molecular motion. The system comprises a radio frequency signal coding module, an acousto-optic modulation module, an optical lens system, a grating module and a frequency stabilization optical system monitoring module. The system has important application prospects in the fields of laser cooling, atom interference, laser isotope separation and the like.

Description

technical field [0001] The invention belongs to the technical field of pulse laser control, and in particular relates to a method and system for light pulse control. Background technique [0002] Optical pulse shaping (that is, optical pulse modulation) technology plays an important role in high-precision spectroscopy research and coherent quantum modulation. In the field of ultrafast optics, multidimensional coherent spectroscopy (MDCS) reveals the coherent dynamics of samples using multi-pulse excitation and coherent detection. MDCS technology requires a phase-stable multi-channel tunable optical delay, and its optical realization under ultrafast laser is technically challenging. For example, in 2003 and 2007, Chinese scientist Tian Peifang and American scientist Patrick F. Tekavec used Fourier Transform Pulse Shaping (FTPS) and interferometry to study multidimensional coherent spectroscopy under optical pulses. For high-resolution nonlinear spectroscopy with delays abov...

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Problems solved by technology

[0006] 1. The interferometry has already determined the maximum number of separable sub-pulses when the experimental optical path is built, and the delay between each pulse is fixed, and the delay cannot be quickly programmed and adjusted. Strictly speaking, it does not belong to the pulse shaping technology. ;

[0007] 2. The maximum length of the delay line of the acousto-optic programmable dispersion filter is limited by its crystal size. Currently, such devices on the market generally only provide a delay of less than 10 ps;

[0008] 3. Fourier transform pulse shaping technology uses its frequency domain component to split light, so it is not suitable for narrow bandwidth laser

However, its spatial wavefront division method itself will affect the single-mode quality and coupling efficiency of its output, especially for the generation of low duty cycle isolated pulses, etc.

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