Walk-off effect in nonlinear crystals suitable for UVC generation

Volet, Nicolas; Ulsig, Emil Z.; Degli-Eredi, Iterio; Tønning, Peter; Stanton, Eric J.

doi:10.1117/12.2581674

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 1b shows a schematic to define the waveguide width (w), height (h), the layer compositions, and the crystal axes relative to the device coordinate system. The BBO crystal is orientated to align d 16 of the second-order nonlinear tensor to the TE-like pump mode in the SiN 45 . A contour profile of the x-polarized electric field of the pump at 445 nm wavelength overlays the schematic.…”

Section: Designmentioning

confidence: 99%

Continuous-wave second-harmonic generation in the far-UVC pumped by a blue laser diode

Stanton,

Tønning,

Ulsig

et al. 2024

Sci Rep

View full text Add to dashboard Cite

Far-UVC light in the wavelength range of 200–230 nm has attracted renewed interest because of its safety for human exposure and effectiveness in inactivating pathogens. Here we present a compact solid-state far-UVC laser source based on second-harmonic generation (SHG) using a low-cost commercially-available blue laser diode pump. Leveraging the high intensity of light in a nanophotonic waveguide and heterogeneous integration, our approach achieves Cherenkov phase-matching across a bonded interface consisting of a silicon nitride (SiN) waveguide and a beta barium borate (BBO) nonlinear crystal. Through systematic investigations of waveguide dimensions and pump power, we analyze the dependencies of Cherenkov emission angle, conversion efficiency, and output power. Experimental results confirm the feasibility of generating far-UVC, paving the way for mass production in a compact form factor. This solid-state far-UVC laser source shows significant potential for applications in human-safe disinfection, non-line-of-sight free-space communication, and deep-UV Raman spectroscopy.

show abstract

Section: Designmentioning

confidence: 99%