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Light with orbital angular momentum of +/-2ħ per photon is produced in commercially available polarization maintaining fiber with modal purity >96%. Twist measurements demonstrate that the orbital angular momentum can be continuously tuned between +/-2ħ.
We demonstrate that average orbital angular momentum (OAM) can be measured with a simplified twist parameter measurement technique. This technique uses a stationary apparatus composed of only a cylindrical lens and a CCD.
We demonstrate a variable-focus technique for characterizing the beam quality of general astigmatic (twisted) laser beams. There are no moving parts, only a focus-tunable lens. Measurements with this method match those made by the standard technique.
Using an ultrafast laser to excite 2D nanostructures, and coherent extreme ultraviolet light to detect the resulting acoustic response, we observe and characterize the shortest-wavelength (35 nm) surface acoustic waves to date.
We make the first observation and quantitative measurement of quasi-ballistic thermal transport from a nanoscale heat source, finding a significant decrease in energy transport away from the hotspot compared with diffusive thermal transport predictions.
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