Axially Symmetric Laser Diode Array for Homogeneous Illumination
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Solution Overview
Problem
Current laser diode bars fail to provide a homogeneous light distribution in axially symmetric laser lamps, limiting their effectiveness in illumination applications.
Innovation Solution
A semiconductor light-emitting device with multiple laser diodes arranged in series along an axis of symmetry, featuring disc, hollow disc, ring, or hollow polygonal optical resonators, ensuring that light is emitted homogeneously in all directions perpendicular to the axis of symmetry, and used in conjunction with phosphor for white light generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional laser diode bars with parallel strip-geometry diodes are used, then the device structure is simple and manufacturing is easy, but the light distribution homogeneity in axially symmetric laser lamps is poor
Solution Approach 1:
The patent employs axially symmetric laser diodes (cylindrical or polyhedral resonators) arranged in series along an axis of symmetry, creating a rotationally symmetric light emission pattern. This asymmetric arrangement of symmetric elements resolves the contradiction by achieving homogeneous radial light distribution (improving illumination homogeneity) while maintaining a relatively simple series configuration (containing device complexity).
Solution Approach 2:
The invention transitions from planar parallel arrangement of strip diodes to a three-dimensional series arrangement along an axis, with light emission in all radial directions. This dimensional change from 2D parallel to 3D axial configuration enables homogeneous illumination in axially symmetric lamps while keeping the device structure manageable through series connectivity.
2Illumination intensity
If axially symmetric laser diodes are used to achieve homogeneous light emission in all directions, then the light distribution homogeneity is improved, but the device complexity increases compared to conventional parallel bar structures
Solution Approach 1:
By using axially symmetric laser diodes with cylindrical or polyhedral resonators that emit light uniformly in all radial directions, the patent achieves homogeneous illumination (improving light distribution) while the series arrangement along a single axis keeps the overall device structure simpler than complex multi-dimensional arrays would require.
3Ease of manufacture
If conventional parallel beam emission from strip-geometry laser diodes is used, then the device structure is simple, but additional optics are required to achieve uniform illumination
Solution Approach 1:
The patent extracts the need for additional forming optics by inherently designing the laser diode array to emit light uniformly in all radial directions. The axially symmetric configuration with series-connected diodes produces the desired uniform illumination pattern directly, eliminating the requirement for separate optical components to shape the beam.
Solution Approach 2:
The axially symmetric laser diode array serves multiple functions simultaneously: it generates laser light, distributes it uniformly in all directions, and maintains a relatively simple series structure. This multi-functionality integrates the illumination uniformity function directly into the device structure, avoiding the need for separate optical systems.
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 enables a high degree of homogeneity in light distribution across cylindrically symmetric surfaces, effectively converting ultraviolet or blue radiation into white light, enhancing the performance of laser lamps by ensuring uniform illumination without the need for forming optics.
Implementation Method 1
These bars of strip-geometry laser diodes emit light in a determined direction as a set of parallel beams
Implementation Method 2
effectively converting ultraviolet or blue radiation into white light
Data Source
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AI summary
The present invention proposes a semiconductor light-emitting device comprising two or more laser diodes, characterized in that each of the laser diodes has an axis of symmetry, wherein the laser diodes are arranged in series on the axis of symmetry of the light-emitting device in such a way that their axes of symmetry coincide, wherein faces of the laser diodes are connected so that they are in electric and mechanic contact and form a bar of the laser diodes, a directional pattern of radiation thereof has an axis of symmetry coinciding with the axis of symmetry of the light-emitting device. The proposed light-emitting device can be used in laser lamps of white light for exciting phosphors since it provides a high degree of flare of cylindrical surfaces.