Contiguous Lasing Grid Structure for High-Speed Laser Arrays
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Solution Overview
Problem
Laser arrays face issues with high capacitance/inductance, leading to slow frequency response, brittleness, low lasing power, and limited array size due to mesa structures, which hinder high-speed and high-power operations in applications like LiDAR and communications.
Innovation Solution
A high-frequency electrical waveguide integrated with a single contiguous structure that reduces capacitance and increases structural integrity, using multi-conductive current confinement techniques to form a grid of lasing points without etching around the entire structure, allowing for parallel connection of P-contact areas to a ground-signal-ground electrical waveguide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mesa structures are used to form laser arrays, then the lasers can be separated and individually bonded, but the structures become brittle and prone to cracking during bonding
Solution Approach 1:
The patent merges multiple separate mesa structures into a single continuous laser structure. Instead of forming and bonding multiple discrete mesas, the invention creates one continuous structure that contains multiple laser emission regions, eliminating the brittleness and cracking issues associated with separate bonded mesas while maintaining the ability to have multiple laser elements.
Solution Approach 2:
The single continuous laser structure is segmented into multiple functional regions that can operate as separate laser elements. The structure contains multiple laser cavities or emission regions within the continuous body, allowing individual control and operation of each laser element without requiring separate physical mesas.
2Adaptability or versatility
If multiple separate mesas are used in laser arrays, then each laser can be individually controlled, but the capacitance and inductance increase, slowing down the frequency response
Solution Approach 1:
The patent combines multiple laser elements into a single continuous structure with a unified electrical connection system. This merging reduces the overall capacitance and inductance compared to multiple separate bonded structures, thereby improving frequency response and speed while still allowing individual control of each laser region through separate current injection paths within the continuous structure.
3Reliability
If mesas are etched around entire laser structures, then current confinement is achieved, but the processing complexity and time increase
Solution Approach 1:
The patent extracts the current confinement function from the traditional mesa etching process. Instead of etching mesas around entire laser structures, the invention uses selective oxidation or other methods to create current confinement regions only where needed, removing unnecessary processing steps while maintaining effective current confinement to the active laser regions.
4Ease of manufacture
If spacing is increased between laser elements for bonding, then mechanical bonding is easier, but the array size increases and bandwidth is limited
Solution Approach 1:
The patent merges multiple laser elements into a single continuous structure that can be bonded as one unit. This eliminates the need for spacing between individual mesas for bonding purposes, allowing laser elements to be positioned closer together, increasing array density and bandwidth while maintaining bonding feasibility through the unified structure.
Data Source
AI summary
Disclosed herein are various embodiments for stronger and more powerful high speed laser arrays. For example, an apparatus is disclosed that comprises an active mesa structure in combination with an electrical waveguide, wherein the active mesa structure comprises a plurality of laser regions within the active mesa structure itself, each laser region of the active mesa structure being electrically isolated within the active mesa structure itself relative to the other laser regions of the active mesa structure.