As can be seen from the video, this is a fiber optic coupling device, which is a multi-mode fiber and the fiber is pluggable. The coupling optical fiber can be customized. The one used here is 100μm, 2m in length, and the interface is FC/PC. There is a buckle on the interface. When installing the optical fiber, insert the optical fiber into the buckle and tighten it.
When the laser is working, the operating current is displayed on the laser power supply, and the laser output power can be adjusted by rotating the button.
395nm is a near-ultraviolet laser, and a weak blue-violet light spot can be seen on the light shielding plate.