Resonantly enhanced nonlinear optics in semiconductor quantum wells: An   application to sensitive infrared detection
  A novel class of coherent nonlinear optical phenomena, involving induced transparency in quantum wells, is considered in the context of a particular application to sensitive long-wavelength infrared detection. It is shown that the strongest decoherence mechanisms can be suppressed or mitigated, resulting in substantial enhancement of nonlinear optical effects in semiconductor quantum wells. 
S. F. Yelin, P. R. Hemmer