Company profile
Covesion Limited
World Leaders in MgO:PPLN Crystals and Waveguides Covesion
Covesion are world leaders in the research, development and manufacture of MgO:PPLN solutions for highly efficient non-linear frequency conversion. Contact us.
Corporate ownership
Updated 07 Jul 2026 09:49
Latest accounts
Financial period: 1 Jan 2024 to 31 Dec 2024
Company events
Reference milestones and recent Companies House filing stream events.
Accounts due
Accounts DueNext accounts due date
Confirmation statement due
Confirmation DueNext confirmation statement due date
Confirmation statement filed
ConfirmationLast confirmation statement made up date
Accounts filed
AccountsLast accounts made up date
Incorporated
InceptionCompany registered at Companies House
Spinout profile
Company description
Covesion manufactures non-linear crystals, specialising in periodically poled lithium niobate, with applications in research, laser systems and equipment manufacturing.
Covesion Ltd is Europe's leading supplier of periodically-poled lithium niobate (PPLN) crystals. We are an SME company founded on technology developed at the University of Southampton and have a 15-year track record in the manufacture of wavelength conversion crystals for scientific equipment, laser displays, missile defence, environmental monitoring, and quantum technologies. We actively participate in Innovate UK collaborative research projects with industrial and academic partners throughout the UK.
Project impact
Covesion are engaged in supplying PPLN materials to a wide range of users encompassing top Universities, research institutes and companies.
Covesion has participated in several projects supported by Innovate UK; HELPS (K2515A), CFC-FREE (AF014L), MATRIX (56273), QWISPS (131877), QWISPS-2 (102668), CASPA (102805), ESCHER (104000), PEPE (3729), and three Knowledge Transfer Partnerships (8758, 9534, 11034). Covesion have commercialised the results of these projects and collaborations with the University of Southampton. There are currently 2 full time scientific/engineering posts within Covesion.
Public funding
Projects
SEQOND (Single-photon Enhanced Quantum Optical Network Detector)
1 Apr 2025 to 31 Mar 2026
High fidelity, modular and scalable receiver modules are recognised as the enabling technology for entanglement distribution, which is essential for quantum key distribution, scalable quantum computing and the transmission of quantum states in the quantum internet. To address this need, SEQOND will develop and demonstrate a novel approach for quantum rece...
HARLEQUIN-ST
1 Apr 2025 to 31 Mar 2027
HARLEQUIN (High Accuracy Robust deployabLE Quantum Inertial Navigaton) is a quantum-classical hybrid inertial navigation demonstrator for use on maritime platforms. In this project, field trials of the system will be conducted on board a vessel operated by the UK's General Lighthouse Authority. Using data gathered from the trial, a programme of system upg...
Integrated high-dimensional Quantum Key Distribution system for communication networks (InQKD)
1 Dec 2024 to 31 May 2026
Encryption is crucial in modern life for securing information and ensuring safe communication across digital platforms. Quantum encryption offers unprecedented security by leveraging the principles of quantum mechanics to create unbreakable encryption keys, making it essential for future-proofing data protection. However, the realisation of mature quantum...
Nonlinear Upconversion Technique for Monitoring Environmental Gases (NUTMEG)
1 Aug 2024 to 31 Jan 2026
Our project, Nonlinear Upconversion Technique for Monitoring Environmental Gases (NUTMEG), will develop, construct and test a portable greenhouse-gas sensor for environmental monitoring applications. We will demonstrate a platform approach targeting CO2, Methane, NOx and Ammonia monitoring. Our innovative approach uses laser upconversion in nonlinear (PPL...
Broadband Quantum Synthesizer (BQS)
1 Sep 2023 to 31 Aug 2025
Quantum technologies are a vital component of the industrial strategy in the UK and Canada, with the potential to revolutionize the digital world, expand the capabilities of current imaging devices, and facilitate the development of new drugs using quantum computing to solve complex calculations. Collaborations between UK and Canadian high-tech industries...
UP-conversion of Single-photons for ENvironnmental SEnsing [UP-SENSE]
1 Nov 2022 to 30 Apr 2024
Reducing human contributions to global warming and the journey to net-zero is a major problem for society to tackle. Technology developments will be a large part of the process to reduce greenhouse gas emissions. The simplest way to reduce is emissions is to reduce gas leaks, requiring very sensitive leak detection equipment. Natural gas (largely consisti...
CIFS - Calcium Ion Frequency Standard
1 Mar 2022 to 28 Feb 2025
Highly accurate atomic clocks have a broad and expanding range of vital applications and are used in many aspects of our daily lives. One well-known example is the GPS navigation system which depends on sub-microsecond accurate timing to provide both position and timing information. This information is used in communications systems, telecoms, finance and...
Blue Laser Integration with Networked Quantum-Memories (BLINQ)
1 Oct 2021 to 31 Mar 2023
One of the largest outstanding challenges faced by photonic quantum computing is how to scale these systems based on existing single photon sources. Single photons are natural carriers of quantum information. They are robust to thermal noise, can be used at room-temperature and sent over optical fibre networks. This makes them particularly suitable for ge...
High Rate of Entangled Photons (HiREP)
1 Oct 2021 to 31 Mar 2023
The HiREP project aims to develop a high-rate polarisation-entangled photon-pair source based on a new nonlinear optical crystal platform recently developed by Covesion Ltd.
WaVelength Meters for the mid-Infrared Enabled by Upconversion in Waveguides (NEW-VIEUW)
1 May 2021 to 30 Apr 2023
QT Assemble: Integrated Quantum Technology Programme
1 Sep 2020 to 31 Aug 2023
QT Assemble brings together a consortium of UK companies to develop highly-innovative assembly and integration processes for new markets in quantum technologies. Waveguide writing, nanoscale alignment and monolithic integration will be used to deliver new levels of performance in robust and reliable platforms. High-performance components and systems will ...
Space-certified Nonlinear Optics for Rugged Quantum Lasers (SNORQL)
1 Apr 2020 to 31 Dec 2021
Quantum technology systems are currently held back by the lack of qualified, commercial off the shelf sub-systems and components to translate new ideas and system designs (for gravitometers, optical clocks etc) quickly into reality. In most cases the underlying enabling technology needs to be developed which adds risk to these projects.In this project the...