A small change in wavelength and power could influence how future semiconductor layers are formed, reducing constraints tied to legacy photolithography systems.
Nuvoton Technology has introduced a high-power violet laser diode designed to support maskless lithography in advanced semiconductor packaging. Operating at a wavelength of 402 nm and delivering an optical output of 4.5 W, the device responds to increasing demand for higher throughput and broader material compatibility in photolithography processes, particularly those driven by artificial intelligence and high-performance computing applications.
The higher optical output enables faster exposure in maskless lithography systems, which rely on direct imaging instead of conventional photomasks. This contributes to shorter development cycles, improved production efficiency and more effective handling of substrate variations such as warpage and distortion. The inclusion of this wavelength also expands compatibility with a wider range of photosensitive materials, an important factor in advanced packaging workflows. In parallel, the device supports a gradual transition away from mercury lamp-based light sources toward semiconductor laser alternatives that offer greater flexibility and efficiency.
From an engineering perspective, the design addresses challenges typically associated with violet laser diodes, including relatively low efficiency and thermal constraints. Enhancements in wall-plug efficiency and heat dissipation enable more stable operation at higher power levels. In addition, refinements such as facet coating help suppress degradation mechanisms, contributing to improved reliability and longer operational lifetime under continuous use. The compact TO-9 CAN package further supports integration into industrial optical systems where space and thermal management remain critical considerations.
Delivering 4.5 W output in continuous-wave operation, the device combines a thermally optimized package with an efficiency-focused structure. It also complements earlier ultraviolet offerings, extending wavelength coverage for both i-line and h-line equivalent applications.
The development reflects ongoing efforts to improve performance, reliability and adaptability in semiconductor lithography light sources.
Click here for the official announcement.
