Ultrafast spin-lasers.

Lasers have both ubiquitous applications and roles as model systems in which non-equilibrium and cooperative phenomena can be elucidated. The introduction of novel concepts in laser operation thus has potential to lead to both new applications and fundamental insights. Spintronics, in which both the spin and the charge of the electron are used, has led to the development of spin-lasers, in which charge-carrier spin and photon spin are exploited.