Optical coatings

The ALD system could be used to coat complex augmented, virtual and mixed reality optics at higher efficiency

Coating complex freeform optics

Tim Reynolds speaks to Gerd-Albert Hoffmann, head of the Optics Integration Group at Laser Zentrum Hannover, about a new spatial atomic layer deposition system

The plasma-based Spatial ALD system operates with rotation and can precisely coat even complex-shaped optics. (Image: LZH)

New ALD system can precisely coat complex-shaped optics

The system achieves higher deposition rates than previously possible, and could apply to the automotive lighting or VR/AR sectors

Northrop Grumman SYNOPTICS optical coating solutions for high LIDT needs in the UV, Visible and NIR spectrums

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With the development of next generation high-energy solid-state lasers, comes the need for laser crystals and optics to meet new demanding requirements. As pulse energy continues to increase, optic component manufacturers are challenged to meet these new needs. The laser damage threshold of the optical thin film coatings used for these critical system components has historically been one of the limiting factors. For medical, industrial, scientific, and defense applications it is becoming increasingly important to not only meet the spectral performance, but also to protect the optical surfaces with coatings that show high laser induced damage threshold (LIDT). This white paper highlights how Northrop Grumman SYNOPTICS optical coating solutions are ideally placed to meet these high LIDT needs in the UV, Visible and NIR spectrums

Thermal Laser Induced Damage in Optical Coatings Due To An Incident Pulse Train, an overview

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Laser Induced Damage Threshold (LIDT) of an optical component de nes the maximum intensity the component can resist before the onset of laser damage and as a result is a critical parameter for any modern laser system, with the LIDT de ning the maximum possible intensity. However laser damage is a multi-faceted and complex problem with multiple theoretical mechanisms depending on pulse duration, optical coating quality and the manufacturing process of the component.

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