Optical power detector with broad spectral coverage, high detectivity, and large dynamic range

Jussi Rossi*, Juho Uotila, Sucheta Sharma, Tuomas Hieta, Toni Laurila, Roland Teissier, Alexei Baranov, Erkki Ikonen, Markku Vainio

*Corresponding author for this work

Research output: Contribution to journalLetterScientificpeer-review

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Abstract

Optical power measurements are needed in practically all technologies based on light. Here, we report a generalpurpose optical power detector based on the photoacoustic effect. Optical power incident on the detector's black absorber produces an acoustic signal, which is further converted into an electrical signal using a silicon-cantilever pressure transducer.We demonstrate an exceptionally large spectral coverage from ultraviolet to far infrared, with the possibility for further extension to the terahertz region. The linear dynamic range of the detector reaches 80 dB, ranging from a noise-equivalent power of 6 nW/ √Hz to 600mW (independent of signal averaging time).

Original languageEnglish
Pages (from-to)1689-1692
Number of pages4
JournalOptics Letters
Volume47
Issue number7
DOIs
Publication statusPublished - 1 Apr 2022
MoE publication typeA1 Journal article-refereed

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