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Cavity ringdown transients for both an SRO:Er sample and a bare quartz substrate detected at upon injection of a pulse at . The experimental configuration is sketched in the inset.
Optical loss spectra for SRO:Er (annealed at 800 and ) and (annealed at ) measured by CRDS on thin films. All spectra have been corrected for the empty cavity response. Estimates of the background loss are indicated for all spectra (dashed lines).
(a) PL spectrum of SRO:Er (annealed at ) measured at room temperature under excitation. (b) Er absorption spectra derived both from the optical loss spectrum, by a subtraction of the background (엯), and from the PL spectrum by means of McCumber theory (∎).
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