Abstract
This paper reports on plasma-enhanced bonding of optics surfaces coated with highly sensitive functional layers using surface preparation by a dielectric barrier discharge (DBD) plasma. The samples to be bonded were treated with a DBD in diffuse mode at atmospheric pressure for 30 s which is applied directly to the sample surface, then joined with the aid of de-ionised water and cured subsequently. The plasma treatment itself already increased the shear strength achieved by a factor of two compared to classical wringing or direct contacting, while the curing process led to a further increase by a factor of up to five, depending on curing temperature. The observed enhancement of shear strength can be attributed to DBD plasma-induced cleaning and most likely additional activation of the surface as verified by contact angle measurements. Since the impact of the used plasma on the surface is quite gentle in comparison to other bonding processes or other plasma-based processes reported in the literature, a destruction of the treated functional layer is avoided. This advantage makes it possible to bond even optics surfaces coated with sensitive materials.
Highlights
Joining-material-free processes for the direct contacting or connection of optically active surface components are of increasing importance due to the growing need and use of UV- and high power laser optics as well as vacuum applications
The particular process gas-dependent treatment times leading to first breakdowns of an non-polarising beam splitter (NPBS) coating during dielectric barrier discharge (DBD) plasma treatment were determined
This paper is the first to describe a method for bonding optics with sensitive metal containing functional coatings
Summary
Joining-material-free processes for the direct contacting or connection of optically active surface components are of increasing importance due to the growing need and use of UV- and high power laser optics as well as vacuum applications. The common method to generate direct contacted optical components without such cement is wringing, known as optical contact bonding [1]. This method originates from the manufacturing process of optics with high demands on surface form deviation or angularity. In addition to temperature fluctuations, environmental influences in the form of vibrations can lead to loosening of the connection. Such wringing is basically not suitable to generate permanently contacted optics
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