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Abstract:
Polarization spectroscopy is used to detect persistent spectral holes photochemically burned into the electronic absorption band of a guest molecule in an amorphous host. Tetraphenylporphin doped into a polymethylmethacrylate (PMMA) matrix is studied as an example. The polarization technique improves the contrast ratio (increase of intensity at the hole over background) by a factor of more than 200. Applications to fast readout of optical memories and line-narrowing spectroscopy are discussed.