Overcoming the speckle correlation limit to achieve a fiber wavemeter with attometer resolution

Graham D. Bruce, Laura O’Donnell, Mingzhou Chen, Kishan Dholakia

Research output: Contribution to journalArticle

5 Citations (Scopus)


The measurement of the wavelength of light using speckle is a promising tool for the realization of compact and precise wavemeters and spectrometers. However, the resolution of these devices is limited by strong correlations between the speckle patterns produced by closely spaced wavelengths. Here, we show how principal component analysis of speckle images provides a route to overcome this limit. Using this, we demonstrate a compact wavemeter that measures attometer-scale wavelength changes of a stabilized diode laser, eight orders of magnitude below the speckle correlation limit.

Original languageEnglish
Pages (from-to)1367-1370
Number of pages4
JournalOptics Letters
Issue number6
Publication statusPublished - 2019 Jan 1


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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