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Optical Surfaces Ltd.

Godstone Road
United Kingdom

Tel: +44 208 6686126

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Affordable High Performance Beam Expander

Affordable High Performance Beam Expander

Product News Wednesday, June 23, 2021: Optical Surfaces Ltd.

Optical Surfaces Ltd. announce a new series of Reflective Beam Expanders with an output clear aperture of 75mm and a selection of magnifications, which are designed for researchers requiring high performance and ease-of-use.

Benefiting from a high throughput off-axis design and new assembly technique – the new A1-Series of Reflective Beam Expanders deliver high performance at a market competitive price and are available on short delivery times.

Available in 3.5x, 5x, 7.5x and 10x fixed magnification configurations – the A1-Series of Reflective Beam Expanders are designed to be easy to use and to provide accurate, unobstructed expansion of any collimated input light source. These new reflective beam expanders are portable and can be used without the need for internal re-alignment.

A1-Series Reflective beam expanders incorporate high precision off-axis mirrors which have constant focal lengths, regardless of the wavelength of light being focused. As a consequence, unlike lens-based beam expanders, they can be used with collimated polychromatic light without the need of any fine focus adjustment.

Supplied housed in a robust aluminium cover - each A1-Series Beam Expander comes with provision for secure fixing to an optical table. Alignment aids are provided to ensure correct beam pointing and tracking during integration. Manufactured to better than lambda/5 transmitted wavefront accuracy, these reflective beam expanders produce no central obscuration and highly efficient transmission is obtained, unspoilt by diffraction patterns.

For further information on A1-Series Reflective Beam Expanders please visit or contact Optical Surfaces Ltd. on +44-208-668-6126 /  

Optical Surfaces Ltd has produced high precision optical components and systems for more than 50 years and are today accepted as one of the world’s leading manufacturers of reflective beam expanders. An interferogram and OPD map is supplied with every reflective beam expander to assure you of its high performance and top-quality construction. The company’s ISO 9001-2015 approved manufacturing workshops and test facilities are deep underground in a series of tunnels excavated in solid chalk where temperature remains constant and vibration is practically non-existent. With such stable conditions testing, particularly with long path lengths, becomes quantifiable and reliable. Working with these natural advantages is a highly skilled team of craftsmen with a commitment to excellence in both product quality and customer service.

Image Caption:  An A1 Series Reflective Beam Expander (courtesy: Optical Surfaces Ltd.)


Worldwide HQ

Optical Surfaces Ltd.
Godstone Road
Surrey CR8 5AA

tel. +44-208-668-6126