Optical Surfaces develops new optics approach

MTF is a technique, trusted by optical designers, for objectively evaluating the image-forming capability of military optical systems. As reflective beam collimators can be used to replicate a target at infinity or interim distances without parallax, they are the device of choice for performing MTF measurements.

However, to test larger diameter military optical systems (> 250mm), or those requiring an MTF system delivering longer focal length focusing, traditionally required an extremely large, heavy and expensive reflective beam collimator system.

“Drawing upon decades of producing high performance reflective beam collimators our R&D team has come up with a novel way of addressing this challenge," said Dr Aris Kouris of Optical Surfaces. "We can now supply large collimators as sub-assembly kits that include a mounted off-axis parabolic mirror and a mounted folding flat that are easily assembled directly onto a standard optical table. Supplied pre-aligned at our production testing facility, once assembled a fine alignment tool allows the customer to quickly and accurately locate the focal plane and centre of the field. As an option, if required, we can also supply a protective cover to fit over your assembled beam collimator system”.

Benefiting from a lightweight compact design – Optical Surfaces' beam collimator kits uniquely combine high stability and high performance, in an elegant solution for testing larger diameter or long focal length military optical systems.

The high stability and performance of these new reflective beam collimator kits is achieved using a zero-expansion parabolic mirror, manufactured to better than lambda/10 p-v surface accuracy. The off-axis design of Optical Surfaces modular beam collimators produces no central obscuration thereby ensuring highly efficient transmission is obtained. The all-reflecting design of these beam collimators is achromatic and with aluminium / magnesium fluoride coatings can operate from the UV to the infrared without adjustment.