A Nonlinear Laser Limiting Structure Based on One-dimensional Photonic Crystal

Abstract

The invention discloses a one-dimensional photonic crystal-based nonlinear laser amplitude limiting structure. The laser amplitude limiting structure is composed of a photonic crystal made of three kinds of media which are arranged in a certain order, wherein the three kinds of media are A, B and C respectively; the structure of the photonic crystal is (AB)6CAC(AB)6; three kinds of media A, B andC suitable for a 532nm laser amplitude limiting photonic crystal structure are diamond, SrF2 and CS3-68 glass respectively, and the thicknesses of the medium layer A, medium layer B and medium layer Care 184.1nm, 92.0nm and 138.1nm respectively; and three kinds of media A, B and C suitable for a 1064nm laser amplitude limiting photonic crystal structure are diamond, CeF3 and CdTe respectively, and the thicknesses of the medium layer A, medium layer B and medium layer C are 149.3nm, 74.7nm and 112.0nm respectively. The one-dimensional photonic crystal-based nonlinear laser amplitude limiting structure of the invention can be effectively used in the 532nm and 1064nm wavelength laser amplitude limiting system so as to achieve high transmittance for low light and high attenuation rate for strong light.

Description

technical field [0001] The invention relates to the field of photonic crystals and nonlinear optics, in particular to a one-dimensional photonic crystal laser limiting structure with nonlinear transmittance, which can be applied to 532nm and 1064nm lasers requiring high transmittance of weak light and high attenuation of strong light Rate nonlinear limiting applications. Background technique [0002] With the wide application of laser in industry, scientific research and medical treatment, laser protection has been paid more and more attention. Because the human eye and photoelectric devices in various equipment may cause irreversible damage under the irradiation of strong laser light, it is necessary to limit the strong laser light. And the laser with weaker power can be used as a signal detection light without limiting, so it is of great significance to make the laser protection structure have nonlinear characteristics. For example, the common lasers with wavelengths of ...

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Problems solved by technology

Among them, the nonlinear laser limiting structure using liquid crystal as a one-dimensional photonic crystal defect layer has a defect of slow response speed; the tunable filter realized by using the mesoscopic calendering effect of the photonic crystal dielectric layer has low sensitivity. Problem: The method of adjusting the incident light angle to realize the tunable function of the filter has high requirements for the control accuracy of the azimuth angle, and it is difficult to apply to the actual laser clipping; the tunable filter based on the two-dimensional photonic crystal structure is difficult to prepare And the nonlinear clipping threshold is too high

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