Middle-infrared band adjustable light delayer based on symmetrical metal clad waveguides

Abstract

The invention discloses a middle-infrared band adjustable light delayer based on symmetrical metal clad waveguides. The two identical metal clad waveguides are adopted and placed in a directly-facing mode, the space between two cladding layers is filled with middle-infrared gain media, and infrared incident light enters the middle-infrared gain media through an infrared laser in air, then is subjected to a series of reflection between the two symmetrical waveguides and is returned to the air as infrared emergent light. According to the middle-infrared band adjustable light delayer, a high-order-mode displacement enhancement effect is introduced into a middle-infrared band, the displacement magnitude is increased to the centimeter magnitude, and reverse displacement which does not exist in visible light and a near-infrared band is generated; Cr<2+> doped zinc-sulfur materials are utilized as the middle-infrared gain media, and the loss of a reflection cycle can be lowered from 3.1 dB to 2.7 dB; sulfur-series infrared glass serves as a waveguide layer, the penetration rate in the wave band ranging from 2 micrometers to 10 micrometers is high, and properties such as the refractive index are stable; the structure is simple, the delaying adjustable range can reach from 0 ns to 52.89 ns, and the relative delay amount is large.

Description

technical field [0001] The invention relates to a mid-infrared band optical delayer, in particular to a mid-infrared band controllable optical delayer based on a symmetrical metal-coated waveguide. Background technique [0002] Since the Goos-Hanchen shift was discovered in 1947, how to enhance the Goos-Hanchen shift has been a research focus of scientists. Since the 21st century, the development of integrated optical devices has been very rapid, and various new optical devices have been reported continuously, so optical devices based on enhanced Goos-Hanchen shifts have also emerged as the times require. Existing studies have shown that the high-order modes excited by the metal-clad waveguide can greatly increase the skin depth of light, thereby generating a large displacement on the reflective surface, which can increase the Gus-Hanchen shift from tens of wavelengths to hundreds of wavelengths in the past. . When the incident light is visible light, the displacement can ...

AI Technical Summary

Problems solved by technology

At present, the research on the theory of higher-order modes of metal-clad waveguides is limited to the visible and near-infrared bands, which is affected by factors such as the large loss of infrared light to metals, the invisibility, and the difficulty of experimental operations.

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