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Confocal laser feedback microscopy for in-depth imaging applications

Confocal laser feedback microscopy for in-depth imaging applications

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We propose confocal laser feedback microscopy for in-depth imaging of highly scattering samples. This technique provides a compact configuration for microscopy in reflectance mode; it is based on laser feedback interferometry which is a sensing technique where the laser acts as both transmitter and receiver of the beam. Operating at 850 nm, it offers an ideal platform for non-invasive and in vivo imaging of soft biological tissues. To explore the technique, the authors performed microscopic imaging of micro-glass-spheres (with diameter sizes of 10–20 µm) deep within an agar gel sample, at depth of 0.43 mm from the surface. Experimental results show the feasibility of a compact, low-cost, and simple laser-scanning microscope with possible biomedical imaging applications.


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      • 17. Tan, Y., Wang, W., Xu, C., et al: ‘Laser confocal feedback tomography and nano-step height measurement’, Sci. Rep., 2013, 3, pp. 17.
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