Improving the energy efficiency of power generation or propulsion systems requires a better understanding of the multiple processes involved, a key point of relevant innovations. This objective, which is based on the ability to characterise the progress of reactions and the production of in-situ pollutants, is based on the availability of efficient laser diagnostics. This project aims to create a world-class centre of expertise on the development and exploitation of ultra-fast laser sources in the field of energy. It builds on the unique expertise of three Normands laboratories: the Centre for Research on Ions, Materials and Photonics (CIMAP), the Interdisciplinary Research Complex in Aerothermochemistry (CORIA) and the Laboratory of Catalysis and Spectrochemistry (LCS), which have expertise ranging from the development of new materials and the development of ultra-fast lasers to the implementation of innovative optical diagnostics in combustion systems and the study of catalysis depollution processes. The CORIA laboratory is responsible for the PERCEVAL Industrial Chair (ANR/SAFRAN Tech) which aims to develop and analyse tomorrow’s aeronautical technologies and the use of ultra-fast laser diagnostics for the study of high-pressure combustion. Ultra-fast sources operating at high rates beyond the kHz while retaining important energies open up prospects for the temporal monitoring of the evolution of physical quantities measured in complex environments, which represents a major step forward compared to the same diagnoses operating in nanosecond regime at the rate of ten of Hz. Another very promising application of these high-speed sources is the dynamic study of reaction mechanisms in catalysis processes. Current developments in these areas are based on commercial laser systems based on massive crystals mainly doped titanium sapphire. However, these systems are limited in cadence due to thermal problems in the crystals. Emerging technologies, based on advanced optical fibers or crystalline architectures pumped by diodes, pave the way for the production of ultra-short, high-energy light pulses at decades of KHz. In this context, CORIA’s laser team has gained extensive experience in the development of ultra-fast fibre-optic laser sources, as evidenced by its numerous innovations in the field (three patents, including one subject to an industrial license). In addition, CIMAP’s MIL team is leading in Europe in the development of high-performance laser crystals for the generation and amplification of ultra-short pulses with patented innovations in the field of laser materials. Building on these skills, this project aims to develop a hybrid ultra-fast laser system combining optical fibers and solid crystals to achieve unprecedented energy and cadence performance and demonstrate its use in spectroscopy in reactive media and catalytic depollution processes. This project will be structured around the three laboratories for the design of laser sources, ranging from crystal design to characterisation of reactive media, a key point for new development pathways for the energy efficiency of energy production systems, the use of alternative fuels (biofuels, residual gases), de-pollution, or CO2 recovery. Based on the international recognition of the teams involved, its originality will offer the means of new large-scale projects at national or European level, thus contributing to the visibility and attractiveness of the project.