Femtometer-resolved simultaneous measurement of multiple laser wavelengths in a speckle wavemeter

Abstract

Many areas of optical science require an accurate measurement of optical spectra. Devices based on laser speckle promise compact wavelength measurement, with attometer-level sensitivity demonstrated for single wavelength laser fields. The measurement of multimode spectra using this approach would be attractive, yet this is currently limited to picometer resolution. Here, we present a method to improve the resolution and precision of speckle-based multi-wavelength measurements. We measure multiple wavelengths simultaneously, in a device comprising a single 1 m-long step-index multimode fiber and a fast camera. Independent wavelengths separated by as little as 1 fm are retrieved with 0.2 fm precision using Principal Component Analysis. The method offers a viable way to measure sparse spectra containing multiple individual lines and is likely to find application in the tracking of multiple lasers in fields such as portable quantum technologies and optical telecommunications.

arXiv comment5 pages, 6 figures

References in corpus (7)

• On-Chip Random Spectrometer
• High-resolution and broadband all-fiber spectrometers
• Harnessing speckle for a sub-femtometre resolved broadband wavemeter and laser stabilization
• Overcoming the speckle correlation limit to achieve a fiber wavemeter with attometer resolution
• Laser frequency stabilization using a commercial wavelength meter
• Deep Learning Enabled Real Time Speckle Recognition and Hyperspectral Imaging using a Multimode Fiber Array
• High speed determination of laser wavelength using Poincaré descriptors of speckle

Cited by in corpus (8)

• Deep learning in nano-photonics: inverse design and beyond
• Controlling light propagation in multimode fibers for imaging, spectroscopy and beyond
• Deep learning enabled laser speckle wavemeter with a high dynamic range
• Wavelength sensitivity of the speckle patterns produced by an integrating sphere
• Determining intrinsic sensitivity and the role of multiple scattering in speckle metrology
• High speed determination of laser wavelength using Poincaré descriptors of speckle
• Speckle-based determination of the polarisation state of single and multiple laser beams
• Induced eccentricity splitting in disordered optical microspheres for machine learning enabled wavemeter