Laser-Excited Crystal Phosphor Waveguide Illumination System
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Solution Overview
Problem
Current discharge lamps used in lighting systems, such as projection systems and automotive headlights, suffer from high power requirements, short lifetimes, high costs, and environmental hazards like mercury, while providing poor luminous efficacy and efficiency, which are not effectively addressed by existing solutions.
Innovation Solution
A lighting system incorporating a laser and a crystal phosphor waveguide with a compound parabolic concentrator (CPC) to generate and direct luminescent light, enhancing efficiency and reducing size and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If discharge lamps are used to provide high intensity output, then illumination intensity is improved, but luminous efficacy deteriorates due to heat dissipation requirements and energy loss
Solution Approach 1:
The patent replaces the thermal discharge lamp system with a laser-based optical system. Instead of using electrical discharge to heat and vaporize materials, the invention uses laser light to directly excite phosphor crystals, converting optical energy to visible light through photoluminescence. This substitution of the energy conversion mechanism eliminates the inefficient thermal arc process and achieves superior luminous efficacy while maintaining high intensity output.
Solution Approach 2:
The patent changes the fundamental operating parameters of the lighting system by transitioning from thermal excitation to optical excitation. The system uses laser diodes operating at specific wavelengths (e.g., 445nm blue laser) to excite phosphor materials with specific emission characteristics. This parameter change in the excitation mechanism enables precise control over the light output spectrum and efficiency, resolving the contradiction between intensity and energy loss.
2Power
If discharge lamps are used to achieve high power output, then illumination intensity is improved, but device size and complexity increase due to heat dissipation requirements
Solution Approach 1:
The invention replaces the complex thermal management system required for discharge lamps with a compact laser-phosphor module. The laser diode and phosphor crystal assembly can be integrated into a small housing without requiring large heat sinks or complex cooling mechanisms, as the laser itself generates minimal heat compared to electrical discharge lamps. This substitution dramatically reduces device size while maintaining high power output capability.
3Illumination intensity
If discharge lamps are used to provide high intensity light, then illumination intensity is improved, but lifetime deteriorates due to thermal stress and material degradation
Solution Approach 1:
The patent substitutes the high-temperature discharge lamp system with a low-temperature laser-phosphor system. The laser diode operates at relatively low temperatures, and the phosphor crystal is excited optically rather than thermally, eliminating the thermal stress that causes filament breakdown and material degradation in discharge lamps. This fundamental substitution results in significantly extended operational lifetime while maintaining high intensity light output.
4Illumination intensity
If discharge lamps are used to generate light, then illumination intensity is improved, but harmful factors increase due to mercury content and environmental hazards
Solution Approach 1:
The invention completely eliminates mercury and other harmful substances by replacing the discharge lamp chemistry with a solid-state laser-phosphor system. The laser diode uses semiconductor physics without any mercury content, and the phosphor crystals are solid-state materials that do not release harmful vapors. This substitution eliminates the environmental hazards associated with mercury disposal and atmospheric contamination while maintaining high intensity light generation capability.
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
The system achieves high-intensity, efficient light generation with improved reliability and flexibility, reducing costs and environmental concerns by using a compact design that preserves light etendue and prevents losses, suitable for applications like projectors and spotlights.
Implementation Method 1
a crystal phosphor waveguide, adjacent to the laser and in the laser light, configured to: generate of a luminescent light based on receiving the laser light
Implementation Method 2
a compound parabolic concentrator (CPC), coupled to the crystal phosphor waveguide opposite the base end, configured to: collect the luminescent light from the crystal phosphor waveguide, and project the luminescent light away from the crystal phosphor waveguide
Data Source
AI summary
An illumination system includes: a laser array assembly including: a laser configured to generate a laser light; a crystal phosphor waveguide, adjacent to the laser and in the laser light, configured to: generate of a luminescent light based on receiving the laser light, and direct the luminescent light away from a base end; and a compound parabolic concentrator (CPC), coupled to the crystal phosphor waveguide opposite the base end, configured to: collect the luminescent light from the crystal phosphor waveguide, project the luminescent light away from the crystal phosphor waveguide.