A high-efficiency and miniaturized UV-C light source at 220 nm has been demonstrated and is capable of replacing the traditional UV lamps in HPLC applications.
Objective: To create a small footprint, stable, deep UV-C laser source
Introduction: The UV-C light source has been actively developed for its wide applications, i.e., in chromatography detectors¹. Generating deep UV-C (200~220 nm) from a visible light fundamental wavelength (400~440 nm diode laser) using the second harmonic generation (SHG) principle has shown great promise. However, SHG light roughly co-propagates with the unconverted fundamental wavelength making extraction of SHG light challenging due to the extreme intensity difference and the absorption loss at UV-C wavelength.