Abstract
Permanent as well as transient spectral holes in the S 1 ← S 0 absorption of tetraphenylporphin in polymeric hosts have been burned and detected at λ = 637 nm with a time resolution in the microsecond range using a single-mode quantum-well semiconductor diode laser. Whereas in polystyrene no measurable spectral diffusion occurs, the holes broaden by about a factor of two in polymethylmethacrylate between 30 μs and 300 s. In a transient hole-burning experiment on the triplet-triplet excited state transition at 780 nm no holes were observed within a scan range of 10 GHz and with delays t d as short as 3 μs.
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