Thales Alenia Space & ESA Advance LISA Telescope Development

Thales Alenia Space has signed a €26.1 million Phase 1 contract with the European Space Agency (ESA) for the development of telescope systems for the LISA (Laser Interferometer Space Antenna) mission. The project involves the design and validation of six ultra-precise optical telescopes required for space-based gravitational wave detection.

LISA will consist of three satellites positioned 2.5 million kilometres apart, forming a laser interferometer designed to measure extremely small distortions in spacetime generated by gravitational waves.

Optical Systems for Space-Based Interferometry
The telescope development program combines the optical instrumentation expertise of Thales Alenia Space and Thales SESO^®. Under the contract, Thales Alenia Space will act as prime contractor responsible for telescope design, assembly, integration, and testing, while Thales SESO^® will manage optics procurement, machining, and polishing.

The six telescopes will be manufactured entirely from Zerodur^®, a glass-ceramic material selected for its extremely low thermal expansion properties. Thermal stability is critical for the LISA mission because the interferometer system must achieve displacement measurements at picometer scale accuracy.

The telescopes will support six laser links between the satellites, forming a large-scale optical interferometer capable of operating within a low-frequency range between 0.1 mHz and 100 mHz. These frequencies are inaccessible to ground-based gravitational wave observatories due to seismic interference and facility size limitations.

Precision Engineering Requirements
The project requires extremely high optical surface precision and structural stability. According to the companies, Thales SESO^® has previously achieved polishing precision levels of 0.2 nanometres on mirrors developed for the Virgo gravitational wave detector in Europe.

In addition to optical manufacturing, the companies will jointly conduct telescope alignment procedures and environmental performance testing. The development program is structured in three phases intended to progressively reduce technical risk before full telescope production.

The contract extends Thales Alenia Space’s existing involvement in the LISA mission. Previous agreements with prime contractor OHB System AG included responsibility for spacecraft avionics, control software, telecommunications systems, drag-free and attitude control systems (DFACS), and propulsion subsystems.

Distributed European Industrial Contribution
The LISA mission involves contributions from multiple Thales Alenia Space facilities across Europe. Operations in France are responsible for telescope development with Thales SESO^®, while facilities in Italy, the United Kingdom, and Switzerland are contributing avionics, propulsion, onboard computing, electronics, and constellation acquisition technologies.

Leonardo is also supplying micro-propulsion assemblies used for ultra-precise satellite attitude control.

Mission Objectives and Deployment
LISA is designed as the first space-based observatory dedicated to gravitational wave detection. The mission will study astrophysical events including compact star interactions and mergers of supermassive black holes.

The satellites will employ drag-free flight control systems derived from ESA’s LISA Pathfinder mission launched in 2015. These systems maintain test masses in near-perfect free fall conditions while preserving laser alignment accuracy across inter-satellite distances of millions of kilometres.

The three satellites are scheduled for launch aboard an Ariane 6 rocket in 2035.

Edited by Natania Lyngdoh, Induportals Editor, with AI assistance.

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