Optoelectronics

Active isolation enables portable reflective collimators

7th August 2015
Siobhan O'Gorman

For organisations looking for the flexibility of being able to use a reflective collimator on different experiments around their laboratory, Optical Surfaces has developed self-aligning isolating feet. The isolating feet allow a ±10mm height adjustment and enable easy relocation of the collimator without any loss of performance. 

The isolating feet clamp onto standard optical tables and operate in two modes. When the unit is static, the isolating feet are set in ‘no floating mode’. However, to ensure safe transfer from one place to another the isolating feet may be set in ‘floating mode’.

High stability and performance on Optical Surfaces’ reflective collimators is achieved using a zero expansion off-axis parabola, which is manufactured to better than lambda/10 p-v surface accuracy. The optics within each unit are secured by the use of stress-free mounts and come pre-aligned in our laboratories for optimum performance. The off-axis design of the collimators produces no central obscuration, ensuring that efficient transmission is obtained.

The all-reflecting design of the reflective collimators is achromatic and coated with aluminium/magnesium fluoride, allowing the device to operate from the UV to the infrared without adjustment. Using zero expansion glass mirror substrates, the collimators provide exceptional operational stability. Each unit has an output port datum plane giving a defined distance to the focus. All reflective collimators provide a 20mm field ensuring full compatibility with standard black bodies.

Standard models include exit apertures of 100, 120, 150, 200, 240 and 300mm. Customised systems can be supplied with larger field sizes, different output interfaces and platforms. Other options include reticle holders, lamp houses and black bodies. Test interferogram and analysis, showing wavefront accuracy, focal length and working distance, are supplied with every collimator.

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