Coherent, Efficient and Practical Polariton Lasers Using a Designable Cavity

Coherence properties are what distinguish a laser from other sources of light and make it useful. This research demonstrates for the first time a polariton laser with coherence reaching the intrinsic limit of single-mode matter-wave lasers. It further demonstrates intensity coherence at the shot-noise limit expected of an ideal coherent state (Figure 1, left), and phase coherence revealing interactions within the polariton condensate due to its matter-wave nature (Figure 1, right).