Output Fiber Alignment Using Stray Light Capture Feedback
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Solution Overview
Problem
Existing fiber laser alignment systems are difficult to transport and use in the field, prone to false positive readings, and do not effectively align with high power lasers or a wide range of process fibers, leading to improper coupling of laser light into the fiber core.
Innovation Solution
A laser alignment apparatus with a housing and light capture chamber featuring a reflective arcuate inner surface, coupled with a photodetector and fiber coupler adapter, and a beam dump/power meter for safe disposal of laser light, allowing for precise alignment of output fibers with a fiber laser using a voltmeter and power meter for monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional alignment systems are used during initial setup, then alignment precision can be achieved, but the systems are difficult to transport for use in the field
Solution Approach 1:
The alignment system is divided into separate functional modules: a fiber coupler adapter for receiving the fiber, a light capture chamber with photodetector for detecting misaligned light, and a beam dump for safe light disposal. This modular segmentation enables the system to be compact and portable while maintaining alignment precision through dedicated functional components.
Solution Approach 2:
The light capture chamber acts as an intermediary device between the fiber output and the alignment verification process. It captures stray light that escapes the fiber core and directs it to the photodetector, providing indirect measurement of alignment quality without requiring complex direct measurement equipment.
2Ease of operation
If existing field alignment devices are used, then portability is improved, but they are susceptible to false positive readings
Solution Approach 1:
The system converts the harmful stray light that escapes from misaligned fibers into a useful signal. The light capture chamber captures this previously wasted light and directs it to the photodetector, transforming it into a reliable indicator of alignment status. This eliminates false positives by using the actual stray light rather than indirect proxies.
Solution Approach 2:
The photodetector provides real-time feedback about the amount of stray light being emitted by the fiber. This feedback mechanism allows operators to continuously monitor and adjust alignment, with the voltmeter displaying quantitative readings that directly correlate to alignment quality, eliminating ambiguous false positive readings.
3Power
If existing alignment devices are used with high power lasers, then alignment can be performed, but the devices may not work safely or effectively
Solution Approach 1:
The harmful high-power laser light is extracted from the main beam path and directed into the light capture chamber. The chamber is designed to safely contain and redirect this light to the beam dump, isolating the sensitive photodetector from direct exposure to high power while still enabling alignment monitoring through the captured stray light.
Solution Approach 2:
The light capture chamber serves as a protective intermediary between the high-power laser beam and the sensitive alignment detection components. It safely handles the high-power stray light and directs it to the beam dump, while allowing the photodetector to measure alignment through lower-power captured light, thus protecting the system from power-related damage.
4Adaptability or versatility
If conventional alignment methods are used, then initial alignment can be achieved, but they do not work with a wide range of process fibers
Solution Approach 1:
The fiber coupler adapter is designed with universal compatibility to accept various fiber types and connector styles. The light capture chamber and photodetector system provides a generic detection mechanism that works with any fiber emitting stray light, making the entire alignment system adaptable to different process fibers while maintaining alignment accuracy through the fundamental principle of stray light detection.
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 enables reliable alignment of output fibers with fiber lasers, even in field settings, preventing misalignment and ensuring proper coupling of laser light, while being portable and safe for high power applications.
Implementation Method 1
The reflective arcuate inner surface of the light capture chamber is configured to reflect light passing from the first end toward the second end when the light is outside the central aperture
Implementation Method 2
at least one photodetector in optical communications with the light capture chamber
Data Source
AI summary
A laser alignment system is used to align an output fiber with a fiber laser, for example, when coupling a feeding fiber to a process fiber using a beam coupler or switch. The alignment system includes a laser alignment apparatus that is coupled at a first end to the output fiber and at a second end to a beam dump/power meter. The alignment apparatus defines a light passage and a light capture chamber along the light passage. When light is not aligned into the core of the output fiber, at least a portion of the light passing out of the output fiber will be captured by the light capture chamber and detected by a photodetector in optical communication with the light capture chamber. By monitoring the readings of the photodetector, the output fiber may be properly aligned with the laser light from the fiber laser.