Figure 6
From: Continuous-wave second-harmonic generation in the far-UVC pumped by a blue laser diode
(a), Setup for capturing images of the far-field showing the placement and orientation of both camera and projection screen. The microscope shown above the conversion chip aids the alignment process of the lensed fiber to the chip. (b, c), Images of the far-UVC reflected off the projection screen, with the upper emission lobe less defined than the lower due to the multiple reflections through the BBO. A considerable spread in the azimuthal angle is observed as phase-matching is achieved with a range of Cherenkov angles.
