Epoxy-Free Laser Assembly Thermal Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laser arrays using UV-cure epoxy face issues with thermal instability, misalignment, and outgassing, which affect performance and production efficiency due to epoxy creep, curing rate differences, and volatile residue.
Innovation Solution
An epoxy-free laser assembly design utilizing soldered connections with tabs to secure laser diode bars, fast axis collimators, beam shaping optics, and wavelength stabilization optics, maintaining the existing footprint and avoiding the use of epoxy adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UV-cure epoxy is used to assemble laser components, then assembly speed is improved, but thermal stability deteriorates due to epoxy creep at high temperatures
Solution Approach 1:
The patent removes the epoxy adhesive from the assembly process entirely, extracting the problematic bonding agent that caused thermal instability. Instead of using epoxy to attach optics to the housing, the invention uses mechanical retention features built into the housing structure itself, eliminating the source of thermal creep and outgassing issues.
Solution Approach 2:
The patent replaces the chemical bonding system (epoxy adhesive) with a mechanical retention system. The housing incorporates precision-machined retention features such as recesses, grooves, or interference-fit structures that mechanically hold the optics in place without requiring adhesive bonding, thereby eliminating thermal degradation of the bonding material.
2Loss of time
If UV-cure epoxy is used to secure optics, then assembly time is reduced, but alignment precision deteriorates due to differential curing rates
Solution Approach 1:
The patent eliminates the epoxy curing process entirely by removing the adhesive from the assembly system. Without epoxy, there is no differential curing rate to cause distortion or misalignment of optical components during the assembly process.
Solution Approach 2:
The housing is pre-designed with integrated retention features during manufacturing, such as precision-machined recesses or mechanical stops, that automatically maintain optical alignment when components are assembled. This preliminary structural preparation ensures alignment precision is built into the design rather than relying on adhesive curing behavior.
3Productivity
If UV-cure epoxy is used for assembly, then production efficiency is improved, but harmful outgassing occurs that damages laser facets
Solution Approach 1:
The patent removes the epoxy adhesive from the assembly process, thereby extracting the source of outgassing. Without epoxy, there are no volatile organic compounds to outgas and contaminate the laser facets during operation, eliminating this harmful effect while maintaining production efficiency through the simplified assembly process.
4Ease of manufacture
If epoxy is applied to side surfaces of VBG, then component positioning is simplified, but alignment precision deteriorates due to epoxy rock and shift
Solution Approach 1:
The patent eliminates epoxy adhesive from the VBG mounting process. Instead of applying epoxy to the side surfaces of the VBG, the housing incorporates precision-machined retention features that mechanically secure the VBG in its correct position and orientation, preventing rock and shift while maintaining ease of assembly.
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 epoxy-free design enhances thermal stability, prevents misalignment, and reduces production time by eliminating outgassing issues, maintaining accurate optical alignment and improving assembly performance.
Implementation Method 1
a connection between the plurality of laser diode bars and the plurality of fast axis collimators, respectively, further comprises a soldered connection
Data Source
AI summary
An epoxy-free laser assembly includes at least one laser array and at least one optics assembly positioned within an optical path of at least one laser array. The laser array and the optics assembly are epoxy-free. In one example, the optics assembly has a beam shaping optic and a wavelength stabilization optic, wherein the wavelength stabilization optic is connected to beam shaping optic with at least one tab and solder. In another example, a plurality of optics assemblies is included within the laser assembly, whereby the laser array and all of the plurality of optics assemblies fit within a footprint of the heatsink. Methods of manufacturing the same are also provided.