Device for generating vortex light field

Abstract

The invention is suitable for the technical field of optics and provides a device for generating a vortex light field. The device comprises a vortex light generating system, a pumping light generating system, a non-collinear optical parameter amplifier and a mode recording analyzing system, wherein a narrow band vortex light beam enters into the non-collinear optical parameter amplifier so as to form a narrow band vortex signal light; a broadband pumping light enters into the non-collinear optical parameter amplifier and pumps the narrow band vortex signal light so as to trigger triple-wave coupling nonlinear conversion and generate an idler frequency light with a broadband vortex light field; the idler frequency light and the narrow band vortex signal light have reciprocal relation at the aspect of topological charge number; the idler frequency light is analyzed and recorded through the mode recording analyzing system. According to the invention, the broadband pumping light enters into the non-collinear optical parameter amplifier and pumps the narrow band vortex signal light so as to trigger triple-wave coupling and acquire the idler frequency light; the narrow band vortex is converted to the broadband vortex; the wavelength and frequency conversion can be realized; the problems of narrow bandwidth and few frequencies of the traditional vortex light beam are solved; the application requirement of the broadband vortex light is met.

Description

technical field [0001] The invention relates to the technical field of vortex light, in particular to a vortex light field generating device. Background technique [0002] Vortex beams refer to a special class of beams with continuous spiral wavefront phase and definite photon orbital angular momentum. The light intensity at the center of its spiral phase is zero, and the phase at the center cannot be determined. Its most general feature is that its electric field expression contains a phase factor exp(imθ), where m is called the number of topological charges. Due to the unique phase and light intensity distribution and large orbital angular momentum of optical vortex, it has been widely studied and applied in the fields of optical micromanipulation, free space optical communication, quantum information theory and optical control optical switch. Since 1989, people first introduced the concept of "optical vortex". The study of vortex beams is only a few decades old, but it...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a vortex light field generating device, which aims to solve the problem of converting narrowband vortex beams in the prior art to obtain broadband vortex beams and realize nonlinear wavelength conversion

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