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Automated Assembly of Optical Microcomponents at Sub-Micrometer Precision

A manufacturer of highly miniaturized light sources wanted to know whether the optics in its module could be assembled and bonded automatically - instead of by hand, as before.

Photonics & Laser

Automated Assembly of Optical Microcomponents at Sub-Micrometer Precision

Photonics & Laser

01Starting point

A manufacturer of highly miniaturized light sources wanted to know whether the optics in its module could be assembled and bonded automatically - instead of by hand, as before. The components are tiny: mirrors, beam splitters and lenses, each made of 1 × 1 × 0.4 mm³ glass, some weighing just 50 µg. They need to be positioned to better than 0.05 µm and 3·10⁻⁴ degrees, then fixed with UV adhesive. The catch: is this even feasible - and exactly where would it fail, before a single axis is even designed?

02Approach

We broke the project down into five processes - dispensing, bonding, handling, and beam and component characterization - and tested each one on its own. The real twist was in the bonding: with a homemade optical lever (HeNe laser, bonded mirror, wall 639 mm away) we measured a whopping 6 to 16% shrinkage, peaking at 18%, instead of the promised 0.2%. At a target accuracy of 0.05 µm, that's not a rounding error - that's the actual source of failure.

03Result

A solid answer, backed by real measurements instead of datasheet values. The effective adhesive shrinkage is now known before it shows up as yield loss in a finished system. On top of that: two adhesives compared, two measurement concepts compared, and a clear recommendation - groundwork that shaves weeks off later development, instead of having to catch up on it expensively down the line.

What's inside

Not a machine, but a complete decision-making foundation: a 10-stage assembly proposal with 106 individual steps and time budget, two adhesives tested on real geometries, two measurement concepts compared for beam characterization, and four system concepts including a recommendation. All of it verified individually, instead of guessed from a spec sheet.

And what happened next

The study has been the basis for further development of the assembly platform ever since. Because one adhesive and one measuring device already failed at this stage, the next stage can build specifically on what passed the test - instead of running into surprises only once the finished system is up and running.

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