Laser Machining Optics With Sapphire Outermost Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laser beam-induced contamination of optics in laser processing systems leads to reduced quality and productivity, machine downtime, and additional costs due to thermal focus shifts and potential damage from localized heating.
Innovation Solution
A device for a laser processing system featuring optical elements with a high thermal conductivity coefficient (≥2 W/(m·K)) as the outermost elements to efficiently dissipate heat and prevent damage, allowing for both passive and active cooling, particularly using sapphire optics with a water-cooled heat sink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optics with low thermal conductivity are used, then manufacturing cost is reduced, but laser beam-induced damage occurs due to localized heating
Solution Approach 1:
The patent applies local quality by using materials with different thermal conductivity properties at different locations in the optical system. Specifically, the outermost optical element (which is most exposed to contamination and laser-induced heating) is made of material with high thermal conductivity (≥2 W/(m·K)), while inner optical elements can use conventional materials with lower thermal conductivity. This localized application of high thermal conductivity material protects the critical surface from damage while minimizing overall system cost.
2Temperature
If high thermal conductivity materials are used for outermost optical elements, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent changes the material parameter (thermal conductivity) of the outermost optical element to ≥2 W/(m·K), which fundamentally alters the thermal management characteristics of the system. This parameter change enables more effective heat dissipation from contamination sites without requiring complex active cooling systems, as the high thermal conductivity material passively conducts heat away from critical areas.
3Temperature
If active cooling is implemented, then heat dissipation is enhanced, but device complexity and cost increase
Solution Approach 1:
The patent enables self-service thermal management by using materials with inherently high thermal conductivity (≥2 W/(m·K)) for the outermost optical elements. These materials passively conduct heat away from contamination sites without requiring external cooling systems. The high thermal conductivity material essentially serves its own cooling function, eliminating the need for complex active cooling infrastructure while maintaining effective heat dissipation.
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 solution effectively reduces machine downtime and increases productivity by preventing laser beam-induced damage and maintaining optical quality through efficient heat dissipation and active cooling, while also providing flexibility with exchangeable lens cassettes.
Implementation Method 1
a first outermost optical element with respect to a propagation direction of the laser beam is made of a material having a coefficient of thermal conductivity kT of 2 W/(m·K) or more
Implementation Method 2
particularly using sapphire optics with a water-cooled heat sink
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The present disclosure relates to a device for a laser machining system (100), comprising laser beam optics for a machining laser beam (10) having an arrangement of optical elements, which are arranged successively in a beam path of the machining laser beam (10). In relation to a propagation direction of the machining laser beam (10), a first outermost optical element (210) of the arrangement of optical elements is made of a material that has a thermal conductivity coefficient k T of 2 W/(m·K) or more.