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Step-modulated decay cavity ring-down detection for double resonance spectroscopy

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)29086-29098
Number of pages13
JournalOptics Express
Issue number22
Publication statusPublished - 29 Oct 2018
Publication typeA1 Journal article-refereed


A method of measuring double resonant two-photon signal and background from a single cavity ring-down decay is introduced. This is achieved by modulating the double resonance loss via one of the light sources exciting the transition. The noise performance of the method is characterized theoretically and experimentally. The addition of a new parameter to the fitting function introduces a minor noise increase due to parameter correlation. However, the concurrent recording of the background can extend the stable measurement time. Alternatively, the method allows a faster measurement speed, while still recording the background, which is often advantageous in double resonance measurements. Finally, the method is insensitive to changes in the cavity decay rate at short timescales and can lead to improved performance if they have significant contribution to the final noise level compared to the detector noise.

Publication forum classification

Field of science, Statistics Finland