Abstract
This paper presents a method for the separation of excited-state absorption transitions from different initial levels by phase-sensitive detection by use of the double-modulation technique. This technique is also applicable for the distinction of spectrally overlapping transitions, and in connection with Judd–Ofelt calculations it allows the excited-state absorption cross sections to be determined. With this method, the and transitions in the spectral range between 720 and 860 nm in -doped were measured and their cross sections determined. The method can be used for any similar system.
© 2005 Optical Society of America
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