Harnessing speckle for a sub-femtometre resolved broadband wavemeter and laser stabilization

Nikolaus Klaus Metzger, Roman Spesyvtsev, Graham D. Bruce, Bill Miller, Gareth T. Maker, Graeme Malcolm, Michael Mazilu, Kishan Dholakia

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Abstract

The accurate determination and control of the wavelength of light is fundamental to many fields of science. Speckle patterns resulting from the interference of multiple reflections in disordered media are well-known to scramble the information content of light by complex but linear processes. However, these patterns are, in fact, exceptionally rich in information about the illuminating source. We use a fibre-coupled integrating sphere to generate wavelength-dependent speckle patterns, in combination with algorithms based on the transmission matrix method and principal component analysis, to realize a broadband and sensitive wavemeter. We demonstrate sub-femtometre wavelength resolution at a centre wavelength of 780 nm, and a broad calibrated measurement range from 488 to 1,064 nm. This compares favourably to the performance of conventional wavemeters. Using this speckle wavemeter as part of a feedback loop, we stabilize a 780 nm diode laser to achieve a linewidth better than 1 MHz.

Original languageEnglish
Article number15610
JournalNature communications
Volume8
DOIs
Publication statusPublished - 2017 Jun 5

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Metzger, N. K., Spesyvtsev, R., Bruce, G. D., Miller, B., Maker, G. T., Malcolm, G., Mazilu, M., & Dholakia, K. (2017). Harnessing speckle for a sub-femtometre resolved broadband wavemeter and laser stabilization. Nature communications, 8, [15610]. https://doi.org/10.1038/ncomms15610