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Spotlight on Optics
Refractive index measurement of suspended cells using opposed-view digital holographic microscopy
Summary by Gabriel Popescu

The refractive index of cells can be used as an intrinsic contrast marker, thus revealing internal structure without...

Using a complex optical orbital-angular-momentum spectrum to measure object parameters
Summary by Juan P. Torres

In a proof of concept experiment, Xie et al. demonstrate the advantage of using spatial modes in their case modes that...

Low-loss reciprocal optical terminals for two-way time-frequency transfer
Summary by Fritz Riehle

Linking optical clocks through the turbulent air without losing a single cycle of the optical frequency allows for a...

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