Sensitive interferometry with multimode fibres
Abstract
Fibre coupling is a convenient implementation of various types of optical sensors. However, when the optical sensor is based upon interferometry, the choice of fibre is usually restricted to a single-mode fibre, limiting the étendue of the sensor system. Here, we show that it is possible to configure an interferometric sensor using a multimode optical fibre supporting many spatial modes, thereby increasing the étendue. By using off-axis holography, the full complex amplitude of the speckle pattern transmitted through the fibre can be recovered from a single frame of a detector array, enabling high-speed operation. Using this approach, we have demonstrated stand-off laser vibrometry where the only collection optic is the multimode fibre itself. Our vibrometer can recover vibration frequencies using a high-speed camera with power levels as low as 0.003 μW , well below the noise floor of the camera, with an overall sensor bandwidth above 2300 Hz.
Read the paper
Related studies
- Lathyrism-induced alterations in collagen cross-links influence the mechanical properties of bone material without affecting the mineral
- High-Resolution SPECT-CT/MR Molecular Imaging of Angiogenesis in the Vx2 Model
- Severely impaired bone material quality in Chihuahua zebrafish resembles classical dominant human osteogenesis imperfecta
- Small-animal SPECT and SPECT/CT: application in cardiovascular research
- Intravital imaging of osteocytes in mouse calvaria using third harmonic generation microscopy
- Techniques and Evaluation From a Cross-Platform Imaging Comparison of Quantitative Ultrasound Parameters in an In Vivo Rodent Fibroadenoma Model
Go deeper in Evidence Hub
Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.