Pharmaceutical & medical “The high signal-to-noise ratio, wide dynamic range, and
strong sensitivity in the visible range of Yokogawa spectrum analysers allows us to obtain reliable measurements – even at very low optical signal levels,” – comments Lasse Orsila, optical engineer and medical doctor, Modulight. Copyright of Modulight
especially important, while the AQ6370E units provide broader flexibility for trace comparison, filter assessment, low-level signal visibility, and detailed laser-source analysis. Their precision, reliability and extreme lifespan have garnered a lot of trust at Modulight. Apart from technical measurement benefits, one example that Dr. Orsila brought up is the ability of Yokogawa devices easily compare traces with other traces that have been recorded on the device, with built-in analysis tools.
THE RESULTS
The use of Yokogawa’s AQ6373E and AQ6370E optical spectrum analysers has given Modulight a dependable measurement platform for characterising laser performance across visible and near-infrared (NIR) applications. With the ability to detect and characterise center wavelength, linewidth, spectral tails, signal strength, low-level spectral content, and SMSR with greater clarity, Modulight’s engineers can build a more complete picture of laser behaviour during development. This is especially valuable in demanding areas such as the development of fluorescence-based systems, photoimmunotherapy, and ophthalmic laser applications, where spectral precision and clean optical output are critical.
engineers need more than a strong output signal. They need precise wavelength control, stable output power, low noise, and enough spectral visibility to understand exactly how the laser is behaving across the full emission profile. For Modulight’s teams, the essential measurement tasks include accurate centre wavelength verification, linewidth evaluation, observation of low-level spectral content, and comparison of traces under different conditions. In filter measurements, for example, the engineers want to compare the actual signal from their own laser source before and after the filter, rather than rely only on generic spectrophotometer data. In fluorescence and biomedical illumination, engineers need to see a weak optical response beside a dominant laser line.
This places particular importance on sensitivity, dynamic range, and clean spectral visibility. If low-level optical content is masked by noise, engineers lose insight into behaviour that may matter in the final application.
Dr. Lasse Orsila shares an insight into the evaluation of the lasers: “Obviously wavelength is an important parameter. Other parameters are also very important depending on use-case, such as dynamic range when measuring filter properties. Certain metrics like side-mode suppression ratio allow engineers to quickly determine pass/fail for
Instrumentation Monthly June 2026
single-mode lasers, without requiring additional measurement equipment or manual calculations.”
MEASUREMENT SOLUTION To achieve this level of insight, Modulight relies on high-performance optical spectrum analysis. Engineers use multiple Yokogawa OSAs covering different wavelength ranges to support work in the production facility as well as in R&D laser laboratories, where chip- and bar-level testing is also performed. With multiple laser models spanning the ultraviolet (UV) to mid-infrared (MIR), Modulight faces a challenge in finding measurement solutions that are reliable, comprehensive, and capable of handling the full spectral range.
“What I value in the Yokogawa optical spectrum analysers is their reliability and precision. They are also very easy to use,” explains Dr. Orsila. “The availability of OSAs in the visible range is much more limited than in the telecom or near-infrared ranges. Yokogawa can cover nearly all the wavelength ranges we work with, and performance in the visible range is particularly important to us.” Modulight’s workflow is therefore built around Yokogawa OSA tools for visible-light characterisation, trace comparison, filter assessment, and low-level spectral analysis. The AQ6373E supports visible-light spectra characterisation where wavelength placement and spectral shape are
“The high signal-to-noise ratio, wide dynamic range, and strong sensitivity in the visible range allows us to obtain reliable measurements – even at very low optical signal levels,” comments Orsila. Beyond the immediate measurement capability, the Yokogawa platform has helped make optical characterisation more practical day to day. Clearer signals, strong sensitivity, and the ability to record, compare, and analyse traces within the instrument workflow give engineers a faster and more confident way to evaluate devices and the performance of optical filters. With Yokogawa’s instruments, engineers can perform measurements more efficiently and compare lasers across types and wavelengths with ease.
Reliability is also a major part of the result. For Modulight, trust in a measurement platform is built over years of use, not just a single specification sheet. The long service life of Yokogawa optical equipment (previously known under Ando name), combined with excellent usability, support, and consistent performance, has helped establish the analysers as a trusted part of the company’s workflow. As a result, Modulight can validate laser behaviour with greater clarity and consistency in the quality of its spectral data. By combining visible light range capability, deeper near-infrared light analysis, and a practical engineering workflow, Yokogawa’s analysers help ensure that demanding medical and photonic laser technologies can be validated with the precision, repeatability, and clarity they require.
Yokogawa Test & Measurement
tmi.yokogawa.com
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