Optical Unit Light-Shielding Film for Laser Diode Adhesive Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-power laser systems, particularly those using laser diodes with narrow pitch emitters, the adhesive used to bond optical components can deteriorate due to Rayleigh scattering of short-wavelength laser light, leading to displacement of the optical axis and poor beam quality, as existing solutions like light-shielding portions between lenses are insufficient in suppressing scattering.
Innovation Solution
An optical unit for a laser processing system that includes a laser diode, a lens unit, and a holding block with a light-transmitting property, bonded using adhesives, and a light-shielding film with reflective or absorptive properties placed between the lens unit and the holding block to prevent laser light from reaching the adhesives, thereby reducing scattering and adhesive deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding portion is provided between lenses in a lens unit, then some laser light blocking is achieved, but Rayleigh scattering of glass in the lens unit cannot be suppressed and laser light may still hit the adhesive causing deterioration
Solution Approach 1:
The harmful scattered laser light is extracted and blocked by the light-shielding film positioned between the lens unit and holding block, separating the light-blocking function from the adhesive bonding function and preventing adhesive deterioration
Solution Approach 2:
A light-shielding film is introduced as an intermediary component between the lens unit and holding block to intercept scattered laser light before it reaches the adhesive, preventing the harmful interaction between laser light and adhesive
2Ease of manufacture
If adhesive is used to bond lens unit and holding block, then assembly is simplified, but adhesive deterioration occurs when laser light reaches the adhesive causing optical axis displacement
Solution Approach 1:
The light-shielding film serves as a protective intermediary between the laser light path and the adhesive, allowing the adhesive to perform its bonding function without being degraded by laser light exposure, thus maintaining both assembly simplicity and optical precision
Solution Approach 2:
The light-shielding film is positioned in advance to prevent laser light from reaching the adhesive before deterioration can occur, proactively protecting the adhesive bond and maintaining optical axis alignment
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 solution effectively prevents adhesive deterioration, maintaining the optical axis alignment and beam quality by reflecting or absorbing short-wavelength laser light, ensuring high-quality beam formation in laser processing systems.
Implementation Method 1
laser light having a short wavelength is likely to be scattered in various directions inside a glass due to Rayleigh scattering
Implementation Method 2
a light-shielding film having a light-reflecting property or a light-absorbing property
Implementation Method 3
a light-shielding film having a light-reflecting property or a light-absorbing property
Data Source
AI summary
An optical unit for a laser processing system includes a laser diode including a plurality of laser emitters which emit laser light, a lens unit including a plurality of lenses, a holding block having a light-transmitting property, and a light-shielding film. The holding block and the laser diode are bonded to each other with a first adhesive, and the lens unit and the holding block are bonded to each other with a second adhesive. The light-shielding film is located between the lens unit and the holding block.