24 Sep. Laser characterization for the development of quantum computers
Sponsored Post – Quantum computers could take digital technologies to a whole new level of performance – far beyond what traditional computers are capable of. This requires specialized lasers that emit light with precisely defined wavelengths in the visible or near-infrared spectral range. As their development and production become increasingly complex, precise measurements over a wide wavelength range are essential.
How Precision builds a solid foundation
Vexlum, a spin-off from the University of Tampere in Finland, is one of the few companies worldwide capable of manufacturing vertical external cavity surface emitting lasers (VECSELs) for quantum computers. Extremely narrow-band emission at a single, precisely defined frequency is crucial for these applications. To ensure this stability, Vexlum precisely controls three key components of a high-power laser: the gain structure, the pump source, and the external resonator. While conventional concepts for narrow-band high-power lasers often consist of three separate modules – seed laser, amplifier, and emitter – Vexlum’s VECSEL is based on a monolithic concept. This compact 3-in-1 architecture significantly reduces system complexity while achieving higher output powers than classic edge-emitting lasers or VCSELs.
Reliable analysis without parallel test setups
Vexlum relies on optical spectrum analyzers from Yokogawa. The AQ6370E covers 600-1700 nm, offers a typical measurement accuracy of ±0.008 nm, and a resolution of up to 0.02 nm. For detailed analysis, the device features a High Close-in Dynamic Range (HCDR) mode, which resolves spectral peaks more sharply and significantly improves the capability of displaying side modes. Vexlum has been working with Yokogawa equipment since its beginning as a university research group. The company now employs around 25 people and is preparing for series production of its lasers.
It is not only the performance and wavelength range of the AQ6370E OSA which meet our requirements, we also really like its usability, and the scope that it gives to automate some of the test operations, to enable us to maximize our productivity in the laboratory and in the factory. We wouldn’t have been able to verify the performance of our VECSELs without the AQ6370E – it has been essential for precise characterization throughout both R&D and production.” – Jussi-Pekka Penttinen, co-founder, CEO, and CTO of Vexlum
The complete case study can be found here: yokogawa.magazines.center/case-study-vexlum
Source and image: tmi.yokogawa.com