3 results about "Visible band" patented technology

An AlO x A method for preparing an Al2O3 low-reflection, etch-resistant composite coating includes the following steps: In a first chamber, the surface of a substrate is cleaned by ion bombardment; in a second chamber, argon and oxygen are introduced, and at least one layer of Al2O3 is deposited on the surface of the substrate using pulsed DC magnetron sputtering. x Layer; containing AlO x The substrate of the layer is fed into the third chamber, argon and oxygen are introduced, and AlO is sputtered using pulsed DC magnetron sputtering. x An Al2O3 layer is deposited on the surface of the layer and cooled in the furnace to obtain AlO. x - Al2O3 low-reflection, etching-resistant composite coating. This invention constructs a non-stoichiometric Al2O3 composite coating within the composite coating. x A gradient structure of oxygen content gradually transitioning from a layer to a dense Al2O3 layer, with low oxygen content AlO2O3. x The layer has a high oxygen vacancy concentration and low reflectivity, which can effectively reduce the reflection intensity in the ultraviolet-visible band. The dense Al2O3 layer formed on the surface has good structural stability and chemical inertness, thus significantly improving the etching resistance of the coating in the plasma etching environment.

This invention discloses a nitride single-transverse-mode dual-pass racetrack-shaped microring waveguide for the external cavity of a visible-light FP laser. It employs an AlN ridge waveguide system or a GaN strip waveguide system, achieving low-loss transmission of a single transverse mode in the visible-light band through precise control of waveguide cross-sectional parameters. The waveguide structure consists of two main straight waveguides and a racetrack-shaped microring waveguide forming a dual-pass coupling structure. The main waveguides are equally spaced on both sides of the microring straight track, forming three ports: input, pass-through, and download. This invention utilizes the dual-pass structure to feed back specific mode optical signals into the FP laser cavity, achieving self-injection locking and spectral purification. This invention features rigorous design logic and a compact structure, possessing significant monolithic integration application value in the fields of laser displays and precision atomic clocks.