Fiber-laser-based ultrasound sensors have attracted great interest because of their applications in compact and endoscopic imaging modalities. The noises of such an ultrasound sensor may originate from its light source, optical amplifier, photodetector, and data acquisition card. Here we present an optical signal duplication technique that can increase the signal-to-noise ratio by 1.6–2.4 times. Furthermore, this technique does not require multiple signal excitations in a single voxel and, thus, allows for a high imaging speed in most applications. We demonstrate the optical signal duplication technique in all-optical laser-scanning photoacoustic microscopy. In vivo microvascular imaging shows that the noise-reduced sensor can enhance the contrast-to-noise ratio by 3.5 dB.
© 2019 Optical Society of AmericaFull Article | PDF Article
21 May 2019: A typographical correction was made to the author listing.
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