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Optical Surfaces Ltd.

Godstone Road
United Kingdom

Tel: +44 208 6686126

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Mounted Reference Flat for ELI-NP Project

Mounted Reference Flat for ELI-NP Project

Company News Wednesday, July 12, 2017: Optical Surfaces Ltd.

Optical Surfaces Ltd. has produced a 600mm diameter mounted reference flat mirror that will enable Thales ( to perform the alignment of the laser beam expanders implemented in the High Peak Power Laser System for the prestigious ELI-NP project* in Romania.

Working in a uniquely stable manufacturing environment, Optical Surfaces skilled staff was able to produce the silver coated, 2-axis gimbal mounted reference flat with a surface accuracy of better than 20nm rms and surface quality of 40/20 scratch/dig.

The optimised beam expanders will be used to produce a precisely expanded laser beam which will enable smaller laser spot sizes to be achieved when used in combination with additional focusing optics. This is very useful in laser focusing optimisation.

The Extreme Light Infrastructure for Nuclear Physics (ELI-NP) project* aims to develop an unique and high technology research center in Magurele (Romania) including the most powerful laser system ever achieved: a 2x10PW laser system. . The €60 million contract awarded to Thales to develop the laser system is the largest contract by a national research institute under a European-funded programme.

For further information on ultra-high precision reference flats please visit or contact Optical Surfaces Ltd. on +44-208-668-6126 /

Optical Surfaces Ltd. has been producing optical components, reference flats and beam expanders for more than 50 years and is now accepted as one of the world’s leading suppliers for high power laser research. The company’s ISO 9001-2008 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.


Worldwide HQ

Optical Surfaces Ltd.

Godstone Road
Surrey CR8 5AA

tel. +44-208-668-6126