Room-temperature strong exciton-photon coupling phenomena was studied in a low-finesse quantum microcavity entirely filled with 17.5 pairs of GaAs (80 A)/Al_0.3 Ga_0.7As (42 A) quantum wells. The front and back distributed Bragg reflectors of the microcavity consist of only 6 and 8 pairs of λ/4 stacks of GaAs (30A)/AlAs (5A) superlattices and AlAs layers. And the λ/4 GaAs (30A)/AlAs (5A) superlattices are equal to the Al_0.2Ga_0.8As layer in the distributed Bragg reflector.
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