Laser Diode Bar Rear-Light Detection for Degradation Monitoring
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Solution Overview
Problem
The semiconductor laser bar in existing systems cannot detect degradation of light emission characteristics and defects, which affects the overall system performance.
Innovation Solution
A laser module design that includes a laser diode bar with emitters emitting light from a front surface and leaking light from a rear surface, a housing with a reflecting surface to scatter and reflect the leaked light, and a detector to detect the reflected light, allowing for the detection of degradation and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor laser bar is used without a detection system, then the device structure remains simple, but the degradation of light emission characteristics and defects cannot be detected
Solution Approach 1:
The patent introduces a detector as an intermediary component that indirectly monitors the laser diode bar's performance by detecting light leaked from the rear surface. This mediator enables detection capability without requiring direct monitoring of the laser emitters themselves, thus adding minimal complexity while achieving reliability improvement
Solution Approach 2:
The detector provides feedback information about the light emission characteristics by measuring the leaked light intensity. This feedback mechanism allows the system to detect degradation and defects, enabling monitoring and maintenance decisions without complex direct measurement systems
2Measurement precision
If light leaked from the rear surface is directly detected, then the detection structure is simple, but the detection precision is insufficient due to weak light intensity
Solution Approach 1:
The patent converts the previously harmful or wasted leaked light from the rear surface into a useful detection signal. By capturing and detecting this leaked light, the system transforms a loss into a beneficial monitoring mechanism, improving detection precision without requiring additional light sources or complex illumination systems
Solution Approach 2:
The patent replaces direct mechanical or electrical monitoring methods with optical detection. By using a detector to measure the optical signal (leaked light), the system achieves precise measurement without complex mechanical sensors or electrical probes on the laser emitters
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
Enables the detection of degradation and defects in the laser module, thereby monitoring and addressing any issues in the light emission characteristics.
Implementation Method 1
a housing including a reflecting surface configured to surround a space together with the laser diode bar and reflect, toward the space, light leaked from the rear surface, in a scattering manner
Implementation Method 2
reflect, toward the space, light leaked from the rear surface
Implementation Method 3
a condenser lens on which light leaked from rear surfaces of all of the plurality of emitters impinges
Implementation Method 4
condenser lens on which light leaked from rear surfaces of all of the plurality of emitters impinges
Implementation Method 5
a detector configured to detect light reflected by the reflecting surface
Data Source
AI summary
A laser module includes: a laser diode bar including a plurality of emitters configured to emit laser light from a front surface and leak light from a rear surface; a housing including a reflecting surface configured to surround a space together with the laser diode bar and reflect, toward the space, light leaked from the rear surface, in a scattering manner; and a detector configured to detect light reflected by the reflecting surface. A laser module includes: a laser diode bar including a plurality of emitters configured to emit laser light from a front surface and leak light from a rear surface; a condenser lens on which light leaked from rear surfaces of all of the plurality of emitters impinges; and a detector configured to detect light transmitted through the condenser lens.