Laser Processing Head Wavelength-Selective AR Coating
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Solution Overview
Problem
The existing laser processing devices face challenges in accurately detecting variations in laser light output due to different wavelengths, leading to increased costs for specialized sensors and anti-reflective coatings, which are necessary to manage the varying wavelengths such as infrared and blue laser light effectively.
Innovation Solution
A laser processing head with a beam splitter coated for higher reflectance for one wavelength and lower reflectance for another, paired with a detector having corresponding light receiving sensitivity, allows for accurate detection of laser light output variations while minimizing costs by optimizing the amount of reflection light entering the detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensors are provided for different wavelengths to detect reflection light, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
A single detector is designed to detect reflection light across multiple wavelengths (infrared and blue laser light) by optimizing the AR coating and detector sensitivity characteristics, eliminating the need for separate sensors for each wavelength and reducing device complexity
Solution Approach 2:
The AR coating is designed with specific reflectance characteristics at different wavelengths, and the detector sensitivity is optimized to compensate for these differences, enabling accurate detection of total power variation across multiple wavelengths using a single detector
2Loss of energy
If an AR coating with low reflectance for both wavelengths is provided, then light transmission is improved, but cost increases
Solution Approach 1:
The AR coating is designed with different reflectance characteristics at different wavelengths - higher reflectance for infrared light and lower reflectance for blue light - allowing cost-effective manufacturing while maintaining adequate light transmission for detection purposes
3Measurement precision
If a detector with high sensitivity for both wavelengths is used, then detection capability is improved, but cost increases
Solution Approach 1:
The detector sensitivity is optimized to have different light receiving sensitivities at different wavelengths, matching the AR coating reflectance characteristics to enable accurate total power detection while using a cost-effective single detector rather than multiple high-sensitivity sensors
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 configuration enables accurate detection of laser light output variations across different wavelengths, reducing costs and allowing for timely maintenance of the laser processing head, thereby ensuring consistent performance.
Implementation Method 1
The AR coating has a first reflectance for reflecting the first laser light higher than a second reflectance for reflecting the second laser light
Implementation Method 2
the beam splitter is provided with an AR coating
Implementation Method 3
the detector has a first light receiving sensitivity for receiving the first laser light lower than a second light receiving sensitivity for receiving the second laser light
Implementation Method 4
a collimator lens that collimates the laser light transmitted through the transmission fiber
Implementation Method 5
a focusing lens that condenses the laser light collimated by the collimator lens
Data Source
AI summary
Beam splitter (23) is provided with AR coating (24). AR coating (24) has a first reflectance for reflecting a first laser light higher than a second reflectance for reflecting a second laser light. Detector (25) detects reflection light (RL) reflected by beam splitter (23). Detector (25) has a first light receiving sensitivity for receiving the first laser light lower than a second light receiving sensitivity for receiving the second laser light.