�y��vlog

These "saturable absorbers" function only at specific wavelengths, says Roy Taylor, a physicist at Imperial College London.

Using graphene as the saturable absorber would not only allow a simpler design but also permit broader spectrum operation.

Most ultrafast lasers use a technique called mode-locking, in which a device known as a saturable absorber soaks up continuous laser emission and releases it in a series of pulses.