VCSEL Meta-Surface DOE for Back Reflection Suppression
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Solution Overview
Problem
Existing VCSELs face challenges in achieving high output power due to back reflections from integrated optical components, which perturb lasing characteristics such as wavelength and threshold.
Innovation Solution
An antireflective diffractive optical element (DOE) with a multi-layer meta-atom structure is integrated with VCSELs, comprising an array of meta-atom unit cells with carefully designed high and low index dielectric layers to minimize back reflections, thereby improving beam quality and reducing divergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If integrated optical components are added to VCSELs to improve beam quality and reduce divergence, then beam quality improves, but back reflections increase which perturb lasing characteristics
Solution Approach 1:
An antireflective diffractive optical element is introduced as an intermediary component between the VCSEL cavity and the external environment. This element serves dual functions: it diffracts the laser beam to improve beam quality while simultaneously providing antireflective properties to minimize back reflections that would otherwise perturb lasing characteristics
Solution Approach 2:
The diffractive optical element is constructed using composite material structures with specific refractive index profiles. By combining materials with different optical properties, the element achieves both diffractive functionality for beam shaping and antireflective properties to suppress harmful reflections
2Shape
If conventional diffractive optical elements are used to improve beam quality, then beam divergence reduces, but absorption increases which lowers output power
Solution Approach 1:
The optical properties of the diffractive element are optimized by adjusting parameters such as refractive index, layer thickness, and diffraction grating geometry. These parameter changes enable the element to achieve effective beam shaping with minimal absorption losses, thereby maintaining high output power
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The DOE reduces laser beam reflections, increases transmission, and lowers absorption, resulting in improved beam quality and higher output power for VCSEL applications.
Implementation Method 1
an antireflective diffractive optical element (DOE) with a multi-layer meta-atom structure is integrated with VCSELs
Implementation Method 2
comprising an array of meta-atom unit cells with carefully designed high and low index dielectric layers to minimize back reflections
Data Source
AI summary
In some implementations, an optical device may comprise a base layer and an antireflective diffractive optical element (DOE) comprising an array of meta-atom unit cells on the base layer. In some implementations, the meta-atom unit cells may each comprise a first set of layers formed from one or more high index dielectric materials, wherein the first set of layers includes a meta-atom layer, and a second set of layers formed from one or more low index dielectric materials. In some implementations, the first set of layers and the second set of layers may be arranged in an identical sequence in each of the meta-atom unit cells. In some implementations, the antireflective DOE may be integrated with a vertical-cavity surface-emitting laser (VCSEL) to suppress back reflections of a laser beam emitted by the VCSEL.