«the connection between

Bose-condensation of quasiparticles in the solid state, and the technological application of ultrafast ultrahigh-gain micro-parametric oscillators and amplifiers is not an obvious one.»

Parametric amplification and polariton liquids in semiconductor microcavities. J. J. Baumberg and P. G. Lagoudakis in Phys. Stat. Sol. B 242:2210 (2005).  What the paper says!?

There is a worth-reading Section «4 Historical perspective (JJB) » where J. J. Baumberg wants to «reflect on how we stumbled upon the enormously-strong parametric scattering process in semiconductor microcavities».