Direct measurement of radiation pressure and circulating power inside a passive optical cavity

Ryan Wagner, Felipe Guzman, Akobuije Chijioke, Gurpreet Kaur Gulati, Matthias Keller, Gordon Shaw

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A mechanical force sensor coupled to two optical cavities is developed as a metrological tool. This system is used to generate a calibrated circulating optical power and to create a transfer standard for externally coupled optical power. The variability of the sensor as a transfer standard for optical power is less than 2%. The uncertainty in using the sensor to measure the circulating power inside the cavity is less than 3%. The force measured from the mechanical response of the sensor is compared to the force predicted from characterizing the optical spectrum of the cavity. These two forces are approximately 20% different. Potential sources for this disagreement are analyzed and discussed. The sensor is compact, portable, and can operate in ambient and vacuum environments. This device provides a pathway to novel nanonewton scale force and milliwatt scale laser power calibrations, enables direct measurement of the circulating power inside an optical cavity, and enhances the sensitivity of radiation pressure-based optical power transfer standards.

Original languageEnglish (US)
Pages (from-to)23492-23506
Number of pages15
JournalOptics Express
Issue number18
StatePublished - Sep 3 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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