Optical Component Mounting with Localized Heating and Stable Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for mounting optical components in laser cavities, such as ball and spring mounts and thermistor-based bonding systems, face issues like thermal instability, component damage, and alignment problems due to thermal expansion differences and movement during heating and cooling cycles, making them unsuitable for commercial laser devices.
Innovation Solution
A baseplate with recesses or apertures to define thermally activated optic mounting areas, combined with pillars and heating elements, allows for preferential heating and secure attachment of optical components with reduced thermal conduction and stress, using a register and dowel system for precise alignment and attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ball and spring mounts are used to retain optical components, then the optical component can be easily installed and removed, but the mount requires periodic realignment due to spring ageing and temperature drifting
Solution Approach 1:
The patent replaces the mechanical spring-based retention system with a thermal bonding system. A heating element activates a bonding medium (solder or adhesive) to securely attach the optical component to the substrate, eliminating springs and grub screws. This substitution provides stable, permanent retention without the alignment drift issues of mechanical systems.
2Strength
If a grub screw is used to retain the optical component, then the component can be securely held, but the screw acts as a source of pressure directly onto the optical component causing stress
Solution Approach 1:
The patent replaces the grub screw mechanical retention method with thermal bonding using a bonding medium activated by a heating element. This eliminates direct mechanical pressure on the optical component while providing secure retention through the bonded joint between the component and substrate.
3Reliability
If PTC-thermistors or NTC thermistors are used as heating elements, then control over the heating process is improved, but the components are more expensive making them less desirable for commercial systems
Solution Approach 1:
The patent changes the parameter of heating element type from expensive PTC/NTC thermistors to more economical alternatives such as resistive heating elements, induction heating coils, or infrared heating sources. This parameter change maintains adequate heating control while significantly reducing component cost for commercial laser systems.
4Ease of manufacture
If heating elements are used to heat the bonding medium via a planar substrate, then the bonding medium can be activated, but heat is conducted throughout the entire substrate causing movement during heating and cooling cycles
Solution Approach 1:
The patent applies local quality by concentrating the heating action at the specific location where the bonding medium needs activation, rather than heating the entire substrate. This is achieved through localized heating elements positioned directly beneath or adjacent to the bonding area, providing targeted heat activation while minimizing thermal conduction and associated movement in other parts of the substrate.
Solution Approach 2:
The patent segments the heating function by using separate, localized heating elements for each bonding area rather than a single large heating element or substrate-wide heating. This segmentation allows independent control of heating zones, reducing unwanted thermal effects on other components while maintaining bonding effectiveness.
5Ease of manufacture
If the level of heat generated by the heating element is increased to transfer sufficient heat to the bonding medium, then the bonding medium can be effectively activated, but this leads to increased movement during heating and cooling cycles and can cause the adhesive to melt
Solution Approach 1:
The patent uses localized heating elements positioned directly at or near the bonding medium, concentrating thermal energy precisely where needed. This localized approach achieves effective bonding medium activation with lower overall heat generation, preventing excessive thermal conduction that would cause component movement or adhesive damage in other areas of the assembly.
Solution Approach 2:
The patent introduces a thermally conductive but mechanically compliant intermediary layer or structure between the heating element and the bonding medium. This intermediary efficiently transfers heat to activate the bonding medium while accommodating thermal expansion and contraction, reducing movement-related problems and preventing adhesive damage from excessive heat.
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 provides high thermal stability and reduced stress on optical components, enabling precise alignment and repeated use without adjustment, improving the reliability and efficiency of optical systems like laser cavities.
Implementation Method 1
The heating element is employed to heat the bonding medium, either directly or via the substrate
Implementation Method 2
solders are known to cause movement during cooling between planar surfaces being secured to one another. This problem is further exacerbated when PTC-thermistors or NTC thermistors are employed since these components themselves are also known to exhibit inherent movement during periods of heating and cooling
Data Source
AI summary
A method and apparatus for mounting optical components is described. The apparatus is suitable for mounting multiple optical components and comprises a baseplate having opposing first and second surfaces. Recesses or apertures are formed within the baseplate and are located upon the first or second surfaces so as to define thermally activated optic mounting areas. Pillars are then located within the thermally activated optic mounting areas and these provide a means for attaching the optical component to the baseplate. The employment of the recesses or apertures act to significantly reduce the thermal conduction throughout the baseplate. As a result preferential heating can be provided to the one or more thermally activated optic mounting areas while maintaining the baseplate with a desired mechanical strength. The optical mounting apparatus exhibits a high thermal stability thus making the apparatus ideally suited for use within commercial optical system.