Laser Package Fast Axis Orientation for High Density
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Solution Overview
Problem
Traditional laser package assembly techniques limit the density of laser diodes due to the orientation of sub-mounts, which restricts the number of lasers that can be placed per unit area and results in insufficient beam overlap, particularly in applications like VR and AR displays.
Innovation Solution
The laser package design involves attaching laser diodes to sub-mounts such that their fast axis planes are parallel and closer together than their lateral distance, allowing for greater beam overlap and increased density by orienting sub-mounts laterally, enabling more efficient use of space and improved beam divergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sub-mounts are placed flat on the base with lasers emitting along slow axis, then each laser has sufficient beam divergence, but the density of laser diodes per unit area is limited
Solution Approach 1:
The patent changes the emission orientation from the traditional slow-axis vertical emission to fast-axis lateral emission. By rotating the sub-mount orientation and utilizing the fast axis emission direction, the laser beams are emitted horizontally rather than vertically, enabling closer spacing of sub-mounts on the base while maintaining adequate beam divergence for the application
Solution Approach 2:
The patent employs a composite structure combining multiple sub-mounts with laser diodes in a specific geometric arrangement. The sub-mounts are positioned with their fast axes parallel and spaced at a distance smaller than the lateral dimension, creating a composite laser array that achieves both high density and sufficient beam overlap for VR/AR display applications
2Quantity of substance
If more laser diodes are placed in a package, then beam overlap increases for VR/AR applications, but the surface area required increases
Solution Approach 1:
The patent transitions from vertical slow-axis emission to horizontal fast-axis emission, fundamentally changing the spatial dimension of beam propagation. This dimensional change allows sub-mounts to be arranged in a compact lateral configuration on the base, increasing the number of lasers that can fit within a given footprint area while maintaining the necessary beam overlap characteristics
Solution Approach 2:
The patent modifies key geometric parameters including the distance between fast axis planes and the lateral spacing between laser diodes. By setting the distance between fast axis planes to be smaller than the lateral distance, the system optimizes the balance between beam overlap and space utilization, achieving higher laser density without proportionally increasing the base surface area
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
This configuration enhances the density of lasers per unit area, reduces scan time, and increases the field of view in AR systems by promoting greater beam overlap and divergence, making it suitable for applications like VR and AR displays.
Implementation Method 1
the laser diodes emit light as a light beam during operation, the light having a fast axis defining a fast axis plane and a slow axis defining a slow axis plane
Data Source
AI summary
A laser package is described, the laser package comprising a plurality of laser diodes separately attached to at least one sub-mount having respective connecting pads, wherein, during operation, each of the laser diodes emits light having a fast axis and a slow axis defining a fast axis plane and a slow axis plane, wherein the fast axis planes of all laser diodes are parallel to each other and the distance between the fast axis planes of at least two laser diodes is smaller than the lateral distance between these laser diodes. Furthermore, a system with at least two laser packages is described.