Safran Reosc

Safran Reosc facility

Safran Reosc is a 100% subsidiary of Safran Electronics & Defense, tier-1 company of the Safran Group.

Safran Reosc is a world leader in the design, production and integration of high-performance optics for astronomy, space, high energy laser and the industry.

Products and services by Safran Reosc meet the most demanding requirements of a number of major research institutes and international scientific programs. Safran Reosc designs and develops innovative astronomical instruments and develops all types of optical components (lenses, aspherical mirrors, etc.) and subassemblies, based on either customer specifications or drawings.

From concept and design to manufacture and integration, Safran Reosc offers a complete range of high-performance optics and high-precision opto-mechanical equipment. 

CEO of Safran Reosc: Philippe Rioufreyt 
Employees: 127 (as of Dec. 31, 2015)

Head office: Safran Reosc – Avenue de la Tour Maury – 91280 Saint Pierre du Perray - France
Tel.: +33 (0)1 69 89 72 00
Fax: +33 (0)1 69 89 76 50


Safran Reosc has been founded in 1937 by a group of scientists from the Paris Institute of Optics, including Henri Chretien, inventor of the so-called Ritchey-Chretien telescope, and Charles Fabry, inventor of the Fabry-Perot interferometer.

After initial activities dedicated to IR and defense applications Safran Reosc rapidly evolved as the French leader in large optical instrumentation for astronomy. When spaced business emerged with the creation of the Centre National d'Etudes Spatiales (CNES), Reosc also developed a leadership in space optics.

In parallel, the former Matra Optique Division developed high skill in high performance dioptric optics and high performance optical coatings, especially for high energy laser for the Centre d'Etude Atomique (CEA).

Safran Reosc became subsidiary of Sfim in 1978, merged with Matra Optique in 1996 and was absorbed by Sagem in 1998. In 2013 Safran Reosc was set back as an SME, 100% subsidiary of Sagem, now Safran Electronics & Defense.

Some key achievements

Safran Reosc is a champion in high performance optics and its history is paved with some famous milestones and world records as follows:

  • 1947: World's first thermal IR images with a 1-m aperture light collecting telescope
  • 1957: Various famous astro optics like the one for the Pic du Midi 2-m telescope and many large astronomical spectrograph instruments. 
  • 1967: Delivery of the ESO 3.6-m primary mirror.
  • 1977: Beginning of large laser coating work and early space developments for CNES
  • 1987: Beginning of space activity with the optics for SPOT, METEOSAT and HELIOS-1
  • 1991-97: Polishing of the four 8-m primary mirrors for the ESO Very Large Telescope (and the two 8-m primaries for the Gemini telescopes). World's largest monolithic mirrors. 
  • 2002: Delivery of the Primary mirror for the Stratospheric Observatory for IR Astronomy (SOFIA), world's largest lightweight mirror produced by machining from a solid blank..
  • 2005: Delivery of the 36 (+6 spare) 1.8-m segments for the Gran Telescopio Canarias 11-m aperture segmented telescope which still remains the world's most accurate telescope thanks to its aperture and diffraction limited performances. 
  • 2007: Maturation of SiC polishing technology and production JWST NIRSpec full set of optics all made from SiC material.
  • 2010: Prototype Projection Optics for lithography
  • 2011: Delivery of the VLT M2AO 1-m aspheric thin shell, world's largest of its kind.
  • 2016: Safran Reosc is selected for polishing and testing the E-ELT secondary mirror, the world's largest convex precision mirror.  


Our plant

Safran Reosc is located 35 km south of Paris, close to the A6 highway, along the Francillienne circular road around Paris and within the Senart ‘ville nouvelle' and development area.

Adress: Safran Reosc -  Avenue de la Tour Maury - 91280 Saint Pierre du Perray - France

Our main building includes all design, manufacturing, AIT means and administrative offices with:

  • A total floor area of more than 6000 m² with a two-level office building
  • 600 m² ISO 6 clean room for the thin film lab
  • 400 m² ISO 6 + 200 m² ISO 5 clean room for AIT

Our giant optics polishing shop, has been set-up in a separate building for the contract for the Very Large Telescope (VLT) 8-m mirrors polishing is unique over the world and act like a long-distance seen lighthouse with its 30-m high tower constituting the vertical optical test bench for these giant optics. After VLT, the shop was adapted to the serial production of the Gran Telescopio Canarias (GTC) 42 1.8-m hexagonal segments. In 2016 the shop is again transformed for the polishing and testing of the E-ELT M2 4-m convex mirror for which we have been contracted by the European Southern Observatory (ESO). 

Capabilities & Products


  • Opto-mechanical and thin-film engineering
  • Machining and lightening of glass or vitroceramic substrates
  • Precision polishing of plane, spherical, aspherical or free-form components, with a significant differentiating factor for large-size products
  • Optical metrology for surface shape and structure; accuracy to within a nanometer
  • Deposition of thin-film optical coatings adapted to high-energy laser, space, astronomy, defense and semiconductor applications
  • Assembly of high-quality opto-mechanical equipment in clean rooms


  • Large monolithic mirrors up to 8 meters in diameter
  • Segmented optics for giant telescopes
  • Thin glass sheets for adaptive optics systems
  • Active mirror assemblies, controlled by support actuators
  • Lightened structures and mirrors made of ceramic glass, silicon carbide or metal
  • High quality lenses and components
  • Customized optical thin-film coating service
  • Diffraction limited dioptric optics
  • Turnkey delivery of astronomy telescopes




Corporate social responsibility (CSR) approach has long been part of Safran's growth strategy, to make sure we meet the expectations of all stakeholders, including employees, partners, customers, shareholders, suppliers and all the other communities in our ecosystem. Our aim is to demonstrate exemplary social and environmental performance.

Our corporate social responsibility

At Safran, we see corporate social responsibility as a source of growth and performance improvement. We pursue core commitments with all internal and external stakeholders, including innovating to protect the environment, striving for excellence in the protection of people and goods, valuing our employees, suppliers and partners, and affirming our integrity.

The six strategic priorities of Safran's CSR policy

Safran's CSR policy is based on six strategic priorities which were defined in 2012 according to the ISO 26000 standard, and in line with our corporate strategy, actions and commitments.


Ethical principles and values: meeting the highest standards

For Safran, carrying out our business in line with the highest standards of honesty, integrity and professionalism is fundamental. All of our employees share the same values and ethics, enabling us to continue to earn the trust of our customers and stakeholders.

We have defined 7 values that are the bedrock of our identity:

  • focus on the customer,
  • meeting our commitments,
  • innovation,
  • responsiveness,
  • the power of teamwork,
  • recognizing the value of our people,
  • corporate citizenship.

Safran was the first company in the French stock market index CAC 40 to be awarded the anti-corruption certificate issued by the French technology information agency ADIT (Agence pour la Diffusion de l'Information Technologique). We have formally expressed our shared principles and guidelines in an ethics charter. Drawn up in 2005 as a common reference document for all employees, this charter defines the rules for professional conduct:

Behavior outside Safran:

  • compliance with laws
  • appropriate professional practices
  • compliance with export laws
  • fair competition
  • gifts and gratuities
  • behavior to customers
  • relations with shareholders
  • relations with suppliers
  • integrity
  • sustainable development
  • political and religious activities.

Behavior inside Safran:

  • controlling information
  • protecting the confidential nature of certain information
  • respecting other persons
  • compliance with the ethics charter.


Health, safety, environment

Committed to health, safety and the environment (HSE)

At Safran, our priorities include the fight against climate change, reducing atmospheric pollution and noise, responsibly managing the use of hazardous substances and ensuring occupational safety. To meet these objectives, Safran develops a culture based on anticipating and managing risks, and continuous improvement.

28 standards
in Safran's HSE guidelines
decrease in the lost time accident rate* between 2008 and 2013
In the last 40 years, the noise generated by single-aisle commercial jets has been reduced by 20 decibels

* Ratio of the number of accidents leading to more than 24 hours off work in relation to one million hours worked



Diversity, underpinning Safran's culture

Diversity drives performance and innovation at Safran. It provides a solid framework for our long-term actions designed to promote equal opportunity and fight against all forms of discrimination. For example, we have long been engaged in the fight for gender equality and equal opportunity. We are also involved in efforts to encourage the hiring and continued employment of people with disabilities, the employment of young people and seniors, and support for the social and professional inclusion of underserved populations.

25% women
in Safran's total workforce, including 20% of management staff*
More than
disabled employees at Safran companies in France*
49% of new hires are less than 30 years old, and over 30% of employees are 50 or older *

* 2013


Safran Reosc's Quality Policy is aimed at involving the company in a process of continual improvement, crucial for reaching its goals of excellence for products and services and, thus, providing customer satisfaction.

This policy focuses on five areas of priority, defined in consistency with the Safran Group values, applied in all the different company sectors:

  • Customer satisfaction
  • Company quality culture
  • Development quality
  • Product / process robustness
  • Supplier quality and supply chain

Company quality and deployment of the quality policy are based on a Quality Management System and internal processes.

Quality Management System

The Quality Management System is based on an organization, in charge of developing the company according to its strategic goals, and on processes aimed at developing a continual improvement approach. The QMS is also formalized in a structural set of reference documents making it possible to conduct projects in compliance with standards, as well as capitalize on company know-how and guide its improvement-oriented approach. Safran Reosc is organized into line management and staff management. Quality management, also structured in consistency with the company's operational organization, is in charge of guaranteeing the quality of products delivered to customers, the respect and improvement of processes, and offering shared methods and tools for quality.

The top goal, developed in the quality improvement plans drawn up per division and per product line, is to deliver quality products within the scheduled time period. These improvement plans incorporate how to deal with non-quality faster, assess whether processes and guidelines are respected, take into account experience feedback, as well as how to improve the reliability of industrial processes, reinforce the quality of industrializations and optimize manufacturing cycles.

The development of methods and quality training for teams is a key success factor in Safran Reosc core activities, involving a high degree of highly skilled labor. The implementation of proven methods of Corrective and Preventive Actions (PDCA, 8D, FMECA Product/Process, HAT/HASS, Lean-Sigma, etc.) make it possible to foresee problems and, if need be, identify them and solve them quickly.

Safran Reosc uses quality guidelines set out in manuals, process description documents, procedures and instructions, based on international standards (ISO9001, EN9100 and EN9110). The organization of these various components is presented in the company Quality Manual, and for Civil Aviation regulations in the Production Organization Manual (POM) and the Maintenance Organization Exposition (MOE).

Certificates and accreditations

To meet customer expectations concerning Safran Reosc's high-technology products and services, in terms of Quality, Costs and Deadlines, Reosc has built and deployed a Quality Management System based on aeronautical standards EN9100 and EN9110, resulting from the ISO 9001 standard, providing additional guarantees of compliance.

Safran Reosc holds certificate testifying to the compliance of its Quality Management System with international Best Practices, according to ISO9001:2008 (according to ISO - International Standardization Organization).


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