Laser Light Source Single Fiber Feedback Loop
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Solution Overview
Problem
Existing laser-based light sources for vehicle headlights are complex and costly due to the use of multiple fibers or branching structures for monitoring and control, which complicates eye-safety and design flexibility.
Innovation Solution
A laser-based light source design that utilizes a single optical fiber to guide laser light to a conversion device and back to a detector, eliminating the need for extra connections and allowing for flexible placement of components, with a detector-controlled feedback loop for closed-loop control and malfunction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple optical fibers or branching structures are used for monitoring and control, then measurement and control precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of multiple optical fibers into a single optical fiber. The single fiber simultaneously guides laser light to the conversion device and carries back-reflected light to the detector, eliminating the need for separate monitoring fibers and reducing overall system complexity while maintaining measurement capability
Solution Approach 2:
The single optical fiber performs multiple functions: it serves as both the excitation light guide and the monitoring light guide. By making the fiber multi-functional, the system achieves the same measurement and control precision without requiring separate dedicated fibers for each function
2Reliability
If multiple fibers or branching structures are used for converter monitoring, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple fiber connections into a single optical fiber connection, reducing the number of components that need to be manufactured and assembled. This simplification lowers manufacturing costs while the back-reflection monitoring mechanism maintains reliability by detecting converter malfunctions through the same single fiber
3Use of energy by moving object
If laser and conversion device are closely coupled, then power efficiency is improved, but adaptability decreases
Solution Approach 1:
The optical fiber acts as an intermediary between the laser and the conversion device, allowing them to be spatially separated while maintaining efficient optical coupling. The fiber transmits laser light to the converter and returns reflected light to the detector, enabling flexible placement of components without sacrificing power efficiency
Solution Approach 2:
The system segments the laser-based light source into separate functional modules (laser, optical fiber, conversion device, detector) that can be independently positioned and optimized. This modular approach, enabled by the optical fiber connection, increases adaptability and design freedom
4Measurement precision
If additional optical or electrical connections are added for detector control, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the control and monitoring functions into the single optical fiber connection. The detector controls and monitors the conversion device through the same fiber that carries the excitation light, eliminating the need for separate control wiring and reducing overall connection complexity
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 design enhances eye-safety, reduces complexity and cost, and increases design flexibility by decoupling the laser and conversion device, enabling efficient control and detection of malfunctions without additional optical or electrical connections.
Implementation Method 1
The at least one optical fiber is adapted to guide the laser light
Implementation Method 2
The conversion device is adapted to convert at least a part of the laser light to converted light. A peak emission wavelength of the converted light is in a longer wavelength range than the wavelength range of the laser peak emission wavelength
Data Source
Figure 1
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AI summary
A laser-based light source (100) comprises a laser (110), an optical fiber (120), a conversion device (130), and a detector (140), the laser (110) for emitting laser light (10) with a laser peak emission wavelength, the optical fiber (120) for guiding the laser light (10) for being received at a first surface of the conversion device (130), the conversion device (130) for converting at least a part of the laser light (10) to converted light (20) with a peak emission wavelength being longer than the laser peak emission wavelength, the optical fiber (120) further for guiding a part of the converted light (20) back in the direction of the laser (110) and the detector (140) for detecting at least a part of the back guided converted light (20). A vehicle headlight comprises such a laser-based light source (100), and a lighting system comprises such a vehicle headlight.