Abstract
An optical-fiber-based apparatus for measuring photoluminescence spectra has been demonstrated. The use of a variable ratio fiber directional coupler and an integral fiber microlens greatly simplifies the optical system for both photoluminescence excitation and collection and permits the attainment of high output power densities (40 kW/cm2) for modest fiber input powers (<5 mW). Spectra from several III-V semiconductor samples are shown which illustrate the sensitivity of the apparatus.
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