Precise measurement of laser power using an optomechanical system

Kazuhiro Agatsuma, Daniel Friedrich, Stefan Ballmer, Giulia DeSalvo, Shihori Sakata, Erina Nishida, Seiji Kawamura

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


This paper shows a novel method to precisely measure the laser power using an optomechanical system. By measuring a mirror displacement caused by the reflection of an amplitude modulated laser beam, the number of photons in the incident continuous-wave laser can be precisely measured. We have demonstrated this principle by means of a prototype experiment uses a suspended 25mg mirror as an mechanical oscillator coupled with the radiation pressure and a Michelson interferometer as the displacement sensor. A measurement of the laser power with an uncertainty of less than one percent (1s ) is achievable.

Original languageEnglish (US)
Pages (from-to)2013-2030
Number of pages18
JournalOptics Express
Issue number2
StatePublished - Jan 27 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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