Erik Beckert

New Joining Technologies for High Stable and Smart Optical Systems

The presentation gives an overview about joining technologies for next generation optics. New concepts for polymer-free, precise and cost efficient manufacturing and assembly processes of modern optical sub-systems are illustrated.

Effect of internal silver conductor on heat spreading capability of LTCC membrane

LTCC membranes are used as substrates of screen printed unimorph deformable mirrors. A high piezoelectric stroke is attributed to thin substrate materials. The application of deformable mirrors with high laser loads calls for a large heat spreading capability of the deformable unimorph mirrors. A large heat spreading capability is attributed to high thermal conductivity of the materials that is not allocated by LTCC. The present paper reports on the effect of internal silver conductor (DuPont 6145) on the heat spreading capability of the LTCC membrane. Therefore, internal silver conductor is applicated into a 570 μm thin membrane on a diameter of 49.8 mm. The optical absorption of plain LTCC membranes and membranes with internal metallization is characterized by an Ulbricht sphere. Membranes with internal silver conductor and a reference sample without internal metallization (plain LTCC) are loaded with a laser beam. The absorbed laser power heats the LTCC membrane. We investigate the temperature increase...

Micro-optics soldering on multifunctional system platforms

Laser beam soldering as a longterm and temperature stable joining alternative to adhesive bonding for optoelectronical systems is introduced. Using a solder alloy that can be processed fluxless (e.g. 80Au20Sn) more functionality than pure position securing, for instance electrical connections and heat sinks for laseroptics, can be incorporated into the joint. Along with smart system platforms, made from ceramics and composites, providing the right interfaces for such functional joints a dense integration of optical and heat generating electrooptical components becomes possible.