Random super-prism wavelength meter

Michael Mazilu*, Tom Vettenburg, Andrea Di Falco, Kishan Dholakia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


The speckle pattern arising from a thin random, disordered scatterer may be used to detect the transversal mode of an incident beam. On the other hand, speckle patterns originating from meter-long multimode fibers can be used to detect different wavelengths. Combining these approaches, we develop a method that uses a thin random scattering medium to measure the wavelength of a near-infrared laser beam with picometer resolution. The method is based on the application of principal component analysis, which is used for pattern recognition and is applied here to the case of speckle pattern categorization.

Original languageEnglish
Pages (from-to)96-99
Number of pages4
JournalOptics Letters
Issue number1
Early online date20 Dec 2013
Publication statusPublished - 1 Jan 2014


  • Spectrometer
  • Resolution
  • Media
  • Fiber


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