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19 July 2019 Pulse interferometry with a free-space Fabry-Perot for shot-noise-limited detection of ultrasound
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Abstract
Coherence-restored pulse interferometry (CRPI) is a recently developed method for optical detection of ultrasound that achieves shot-noise-limited sensitivity and high dynamic range. In principle, the wideband source employed in CRPI may enable the interrogation of multiple detectors by using wavelength multiplexing. However, the noisereduction scheme in CRPI has not been shown to be compatible with wideband operation. In this work, we introduce a new scheme for CRPI that relies on a free-space Fabry-Perot filter for noise reduction and a pulse stretcher for reducing nonlinear effects. Using our scheme, we demonstrate that shot-noise-limited detection may be achieved for a spectral band of 80 nm and powers of up to 5 mW.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Oleg Volodarsky, Yoav Hazan, and Amir Rosenthal "Pulse interferometry with a free-space Fabry-Perot for shot-noise-limited detection of ultrasound", Proc. SPIE 11077, Opto-Acoustic Methods and Applications in Biophotonics IV, 1107714 (19 July 2019); https://doi.org/10.1117/12.2526277
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