Subpicosecond luminescence spectroscopy using sum frequency generation

Abstract

We report an improved time-resolved luminescence spectroscopy system using sum frequency generation. The system has the following attributes: high time resolution (<400 fs, currently limited by the laser), ability to determine absolute zero in time delay with high precision, wide spectral range, and large dynamic range which allows measurement of luminescence under weak photoexcitation. We illustrate these with examples of time-resolved luminescence spectra from GaAs.