Tantuतंतु

Focus a laser into a single-mode fibre with a 4 µm core, and get as much light out of the far end as you can.

Level1

Score0

Best0

Time--

Coupled

Fibre end face

Where the light lands

The spot scatters off the ceramic ferrule. Once it's on the core, the light goes into the fibre and you lose sight of it.

Power meter at the far end

0nW

0Hold above the green line to lock

Last 12 secondspeak –

Steering and focus

The mirrors have fine-thread screws: one turn tilts the mirror 2 mrad. The fibre's focus screw moves it 250 µm per turn.