Frankfurt a. M., Germany  /  05/15/2018  -  05/17/2018

Optatec 2018

Our experts present laser-based process steps for optics fabrication

Mechanically ground (left) and laser polished sphere (right) made of fused silica.
© Fraunhofer ILT, Aachen (D)

Mechanically ground (left) and laser polished sphere (right) made of fused silica.

The demands on shape accuracy and process speed in optics fabrication are constantly increasing.

By using laser-based process steps, conventional process steps can be replaced in order to significantly reduce the process time and increase form flexibility.

Fraunhofer ILT has developed a broad spectrum of laser-based technologies for the fabrication of glass materials optics and will present them at Optatec 2018 from May 15 to 17 in Frankfurt.

Laser-based Form Shaping

Using pulsed laser radiation, glass material can be ablated layer by layer to produce complex optical shapes.

One application example is back side structuring to reduce the weight of optics.

Laser Polishing

The roughness of glass surfaces with area rates of up to 5 cm²/s (e.g. BK7) can be reduced by laser-based remelting (laser polishing).

In addition to laser polishing of optical surfaces, edges can also be quickly rounded and sub-surface damages can be healed by laser polishing.

Laser Beam Figuring

Side view of Aachen Cathedral, selectively removed by laser beam figuring on a flat fused silica sample.
© Fraunhofer ILT, Aachen (D)

Side view of Aachen Cathedral, selectively removed by laser beam figuring on a flat fused silica sample.

With Laser Beam Figuring, glass material can be selectively ablated with vertical resolution of less than 10 nm and a lateral resolution of less than 100 µm.

This procedure can be used for fast laser-based shape correction of optics.