Surface-Emitting Laser Recess Layout for Uniform Light Intensity
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Solution Overview
Problem
Conventional surface emitting laser elements exhibit variations in light emission intensity between light emitting units adjacent to the second region and those elsewhere, leading to inconsistent performance.
Innovation Solution
The surface emitting laser element design includes a substrate with a first region of light emitting units and a second region around it, where the depth of recesses in the second region is greater than those in the first region, and a common electrode is provided for all light emitting units, with the anode electrode covering at least one mesa adjacent to the second region and two others not adjacent, to manage current flow and reduce resistance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a second region is added around the first region in the surface emitting laser element, then the light emission area is expanded, but variations in light emission intensity occur between light emitting units adjacent to the second region and those elsewhere
Solution Approach 1:
The patent applies local quality by making the recess depth different in different regions: the first region has a first recess depth while the second region has a second recess depth that is greater than the first recess depth. This localized structural difference compensates for the influence of the second region on adjacent light emitting units, thereby maintaining uniform light emission intensity across the expanded emission area.
2Manufacturing precision
If the recess depth is increased in the second region, then the uniformity of light emission intensity is improved, but the device complexity increases
Solution Approach 1:
The patent changes the geometric parameter of the recess depth to resolve the uniformity issue. Specifically, it sets the second recess depth (in the second region) to be greater than the first recess depth (in the first region). This parameter adjustment effectively compensates for the influence of the second region while maintaining a relatively simple overall device structure.
Data Source
AI summary
The present technology provides a surface emitting laser element capable of reducing variation in light emission intensity between light emitting units adjacent to the second region and light emitting units other than the light emitting units.A surface emitting laser element according to the present technology includes: a substrate; an electrode provided on one surface of the substrate; a first region which is provided on a side of the one surface opposite to a side of the electrode and in which a plurality of light emitting units having mesas is arranged; and a second region disposed around the first region on a side of the one surface opposite to the side of the electrode, in which a depth dimension of a second recess portion defined by a mesa adjacent to the second region among the mesas of the plurality of light emitting units and the second region is larger than a depth dimension of a first recess portion defined by two mesas adjacent to each other among the mesas of the plurality of light emitting units.