Eye-Safe Laser Lighting With Built-In Optical Safety
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Solution Overview
Problem
Laser-based light sources using phosphor conversion can become unsafe when the phosphor is damaged, leading to direct laser light emission, which existing safety mechanisms often require electrical detection circuits.
Innovation Solution
A built-in safety mechanism using polarization-sensitive components and wave plates is employed to block laser light without electrical detection, ensuring safety by reflecting p-polarized light when the phosphor is damaged, utilizing optics to change and filter polarization states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical detection circuits are used to monitor phosphor status, then safety can be improved, but device complexity increases
Solution Approach 1:
The patent replaces electrical detection circuits with an optical safety mechanism. A wave plate is positioned in the optical path such that when it becomes damaged (indicating phosphor failure), the polarization state of transmitted laser light changes, causing a safety filter to block the laser beam. This optical substitution eliminates complex electronic monitoring systems while maintaining reliable safety functionality.
Solution Approach 2:
The safety mechanism is self-actuating through the physical damage of the wave plate caused by phosphor failure. The system automatically responds to phosphor damage without requiring external detection circuits or control systems. The damaged wave plate physically alters the optical path to block laser transmission, providing autonomous safety response.
2Reliability
If additional safety electronics are added, then safety functionality improves, but ease of manufacture deteriorates
Solution Approach 1:
The patent eliminates electronic safety components by implementing a purely optical safety mechanism using wave plates, filters, and polarization-dependent optical elements. This substitution simplifies the manufacturing process by removing electronic assembly steps while maintaining comprehensive safety functionality through passive optical components.
Solution Approach 2:
The wave plate is designed as a disposable safety component that is inexpensive and simple to replace. When damaged, it can be easily replaced without requiring complex electronic systems, reducing both manufacturing complexity and long-term maintenance costs while maintaining reliable safety protection.
3Reliability
If polarization-sensitive optics are used for safety, then safety reliability improves, but device complexity increases
Solution Approach 1:
The polarization-sensitive optical components serve dual functions: they enable the phosphor conversion process during normal operation and simultaneously provide the safety mechanism when damaged. The wave plate and polarizing filters are integral to both the light conversion function and the safety blocking function, eliminating the need for separate safety systems and reducing overall device complexity.
Solution Approach 2:
The patent merges the safety mechanism with the existing optical components used for light generation. The wave plate, polarizing filters, and optical path are combined to serve both the phosphor excitation function and the safety blocking function, creating an integrated system where safety is inherent in the optical design rather than an add-on.
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
Provides a reliable and simple safety system that prevents direct laser light emission by automatically blocking it when the phosphor is compromised, without the need for additional electronics.
Implementation Method 1
the luminescent material layer comprises a luminescent material configured in a light-receiving relationship with the light generating device and configured to convert at least part of the polarized laser radiation into luminescent material radiation
Implementation Method 2
the first optics are configured to change the polarization of the polarized laser radiation
Implementation Method 3
the second optics have one or more of (i) a polarization dependent transmission and (ii) a polarization dependent reflection for the polarized laser radiation
Data Source
AI summary
The invention provides a light generating system (1000) comprising a light generating device (100), a luminescent material layer (200), and optics (400), wherein: (I) the light generating device (100) is configured to generate polarized laser radiation (101); (II) the luminescent material layer (200) comprises a luminescent material (210) configured in a light-receiving relationship with the light generating device (100) and configured to convert at least part of the polarized laser radiation (101) into luminescent material radiation (211); (III) the light generating system (1000) is configured to generate in an operational mode system light (1001) at least comprising the luminescent material radiation (211); (IV) the optics (400) comprise first optics (410) and second optics (420); wherein the first optics (410) are configured to change the polarization of the polarized laser radiation (101), and wherein the second optics (420) have one or more of (i) a polarization dependent transmission and (ii) a polarization dependent reflection for the polarized laser radiation (101); and (V) the light generating device (100) and the optics (200) are configured such that, relative to an optical path of the luminescent material radiation (211) emanating from the luminescent material (210), the second optics (420) are configured downstream from the first optics (410) and the luminescent material (210).