Laser Diode Facet Structure for Precise Mounting Alignment
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Solution Overview
Problem
Existing methods for producing edge-emitting laser chips face challenges in achieving accurate positioning and preventing damage to the sensitive facets during mounting on submounts or carriers.
Innovation Solution
The laser diode component incorporates a semiconductor layer stack with projecting and/or recessed regions at the radiation exit surface, serving as spacers and adjustment structures to enhance accuracy and protect the radiation exit region during mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If facets are created by breaking a wafer composite along a native crystal plane, then the facet is the foremost area of the laser chip, but active positioning with necessary accuracy is required during mounting
Solution Approach 1:
The patent applies preliminary action by creating the facet recessed relative to the radiation exit surface before mounting. This pre-positioning of the facet within a recessed region eliminates the need for active positioning during mounting, as the facet is already in its correct relative position. The recessed structure is formed during wafer fabrication, allowing subsequent mounting to proceed without precision alignment requirements.
Solution Approach 2:
The patent introduces an intermediary structure - the recessed region - that mediates between the facet and the mounting surface. This recessed region acts as a spacer and positioning element, allowing the facet to be protected and positioned without requiring active alignment during the mounting process. The recessed structure serves as a mechanical intermediary that defines the facet's position relative to the radiation exit surface.
2Manufacturing precision
If the laser chip is mounted on a submount, then coupling into waveguides requires correct distance, but contact of the sensitive facet with an edge of the submount must be prevented
Solution Approach 1:
The patent applies preliminary action by pre-forming the facet within a recessed region during wafer fabrication, before mounting. This ensures the facet is already positioned at the correct distance from the radiation exit surface and is protected from contact with submount edges. The recessed structure is created in advance, eliminating the need for precise positioning during mounting while simultaneously protecting the facet.
Solution Approach 2:
The patent applies beforehand cushioning by creating a recessed region that physically protects the facet from damage. The recessed structure acts as a cushioning element, preventing direct contact between the sensitive facet and potential damaging elements such as submount edges or handling tools. This protective structure is established before mounting, ensuring the facet is shielded during the entire mounting and operation process.
Data Source
AI summary
A laser diode component is described including a semiconductor layer stack including an active zone for emitting laser radiation, a radiation exit surface, where at least a part of the laser radiation exits the semiconductor layer stack, at least one radiation exit region, where an essential part of the laser radiation is emitted and which is arranged at the radiation exit surface, and at least one projecting region and/or recessed region arranged at the radiation exit surface, wherein the at least one projecting region projects over the at least one radiation exit region in a radiation direction and the at least one recessed region is recessed with respect to the radiation exit region in the radiation direction, wherein the semiconductor layer stack comprises traces of material removal at the radiation exit surface. Moreover, a laser diode apparatus and a method for producing a laser diode component are described.