Laser Light Source Color Control via Polarized Reflection
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Solution Overview
Problem
Current laser-based light sources for vehicle headlights lack efficient and simplified methods for color point adjustment and emission manipulation, which limits their ability to produce homogeneous and adaptable light patterns.
Innovation Solution
A laser-based light source comprising one or more lasers, a conversion device, and a manipulation device that utilizes linearly polarized laser light with controlled polarization components to convert and reflect light, allowing for precise control of light intensity and color through angular dependence and external feedback, enabling flexible color adjustment and emission manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional laser-based light sources are used for vehicle headlights, then light emission is achieved, but color point adjustment and emission manipulation are inefficient and complex
Solution Approach 1:
The patent utilizes the angular dependence of reflection for polarized laser light at the conversion device surface as a controllable parameter. By adjusting the angle of incidence or the polarization state of the incident laser light, the reflection ratio changes, enabling continuous color point adjustment without additional mechanical moving parts or complex control mechanisms. This transforms a physical parameter (reflection angle) into a control variable for color manipulation.
2Manufacturing precision
If polarized laser light is used with angular dependence control, then precise color and intensity control is achieved, but the system requires manipulation of polarization components
Solution Approach 1:
The system leverages the inherent polarization properties of laser light sources and the natural angular dependence of reflection at dielectric surfaces. The laser diode inherently emits polarized light, and the conversion device surface naturally exhibits angle-dependent reflection for polarized light. This self-service approach eliminates the need for external polarization control components such as wave plates or polarizers, achieving precise color control through simple angular adjustment of the laser beam.
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 solution allows for precise control of light color and intensity, enabling improved homogeneity and adaptability in light emission patterns, enhancing the performance of vehicle headlights and other lighting systems.
Implementation Method 1
The conversion device is adapted to convert a first part of the first laser light to first light and to reflect a second part of the first laser light at the first surface of the conversion device. The first light is in a different wavelength range as the first laser light.
Implementation Method 2
The manipulation device is arranged to manipulate or control a first intensity of the first part and a second intensity of the second part using an angular dependence of the reflection of the first and the second polarization component of the first laser light at the first surface of the conversion device.
Implementation Method 3
The first laser light comprises linearly polarized laser light with a first polarization component parallel to a plane of incidence of the first laser light with respect to a first surface of the conversion device and a second polarization component perpendicular to the plane of incidence.
Data Source
AI summary
The invention describes a laser-based light source (100) which is adapted to use the angular dependence of the reflection of polarized laser light (10) at a surface of a conversion material to control especially the color point of light emitted by means of the laser-based light source (100). The reflected laser light is within a first wavelength range and the converted light is in a second wavelength range different from the first wavelength range such that the color point of the light emitted by means of the laser-based light source (100) in a defined solid angle depends on the ratio between reflected and converted light. The invention further describes a corresponding method of light emission control, a vehicle headlight (200) comprising such a laser-based light source (100) and a lighting system comprising such vehicle headlights (200).