Technical Information

TN2016-02: Surface Cosmetics of Laser Optics

The surface of optical components plays an integral part in their overall performance as scratches and digs on an optical surface not only increase scatter losses. They can also significantly reduce the coating adhesion as well as reducing the laser-induced damage threshold (LIDT) of a coating. Therefore, especially when optical components are required to withstand […]

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TN2016-01: Laser-induced Damage Threshold in the ultrashort Pulse Regime

Over the last several years much research has taken place to better understand the mechanisms that govern the laser-induced damage threshold (LIDT) in the ultrashort pulse regime. For pulses with a duration of 0.5ns and above, the LIDT mechanisms and the scaling of LIDT from a given pulse duration to another one are well understood […]

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TN2015-03: Virtually Imaged Phased Array (‘VIPA’) Etalons

When the creation of spatial dispersion is required, the most common solutions are to either use a prism or a diffraction grating. Another method is through the use of a modified solid or air-spaced etalon, a solution offering greater dispersive capabilities and insensitivity to polarisation. The modified etalon, shown in image TN-2015-03-1, is called a […]

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TN2015-02: Antireflection Coatings

Uncoated optical surfaces reflect a percentage of the incoming light with the exact amount dependent on the refractive index of the substrate material (see TN2014-03). In optical systems containing a large number of substrates, the various orders of reflection can thereby drastically reduce the contrast of any projected image. This is illustrated below in image […]

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TN2015-01: Calcium Fluoride CaF2

Calcium Fluoride (CaF2) is a crystalline material that occurs naturally as fluorspar. When occurring naturally, CaF2 is often strongly coloured due to the presence of colour centres. In pure form, CaF2 is a very useful material for a wide range of optical applications due to its wide transmission range from 130nm to 10µm for the […]

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