Light Diffusing Element for Uniform Intensity Distribution in Optical Combining
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Solution Overview
Problem
Existing laser combining modules face issues with uneven intensity distribution in the beam profile due to incident angle dependency, leading to a heavy load on optical fibers, potential breakdown, increased space requirements, and higher production costs.
Innovation Solution
A light-emitting device comprising light-emitting elements, a light-diffusing element that diffuses emitted lights, and a light-combining element, where the diffusion occurs within the light-axis direction to achieve uniform intensity distribution, using a light-diffusing plate and multi-mode fibers to combine the diffused lights effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mode scrambler is used to suppress unevenness in intensity distribution, then the intensity distribution becomes uniform, but the light-combining element is subjected to heavy load and may break down
Solution Approach 1:
A light-diffusing element is introduced as an intermediary component between the light-emitting elements and the light-combining element. This diffuser scatters the incident light to reduce the incident angle dependency, thereby uniforming the intensity distribution without subjecting the optical fiber to heavy mechanical loads or complex bending operations
Solution Approach 2:
The invention changes the optical parameters of the light by introducing diffusion. The light-diffusing element modifies the angular distribution of incident light, transforming the concentrated high-angle light into a more uniform angular distribution, which reduces the incident angle dependency of the light-combining element
2Manufacturing precision
If a mode scrambler is used to suppress unevenness in intensity distribution, then the intensity distribution becomes uniform, but the space requirement and production cost increase
Solution Approach 1:
The light-diffusing element is a simple, inexpensive optical component that can be easily manufactured and integrated. Unlike complex mode scramblers requiring precise mechanical structures, the diffuser is a straightforward optical element that significantly reduces system complexity, space requirements, and production costs while achieving the desired intensity uniformity
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 solution suppresses unevenness in the intensity distribution of the output light, reduces the risk of optical fiber breakdown, minimizes space and production costs, and maintains high combining efficiency while allowing for the use of multiple light-emitting elements with varying wavelengths.
Implementation Method 1
a light-diffusing element that diffuses the respective emitted light out of a plurality of light-emitting elements and outputs the diffusion lights
Implementation Method 2
a light-combining element that receives the diffusion lights and outputs an output-light obtained by combining the diffusion lights
Data Source
AI summary
The light emitting device is provided with a plurality of emitted elements 11, 12 to 1n; a light diffusion element 40 which diffuses emitted light L11, L12 to L1n respectively from the light emitting elements 11, 12 to 1n and outputs diffused light L21, L22 to L2n; and an optical coupling element 50 which receives the diffused light L21, L22 to L2n and outputs the output light L3 that is obtained by coupling the diffused light L21, L22 to L2n. The light diffusion element 40 diffuses the emitted light L11, L12 to L1n into a range that includes the direction of the optical axis of the optical coupling element 50.