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Published on Mar 23, 2016
0:05 – using fingernail to break fiber, no need to cleave ! 0:11 – clean fiber 0:20 – open hatch 0:23 – load fiber onto 0:26 – close the clamps to hold the fiber 0:36 – close the hatch 0:45 – move axial position of fiber 0:57 – move the fiber position to center of the screen 1:02 – remove the fringes and adjust focus to make sure the fiber is in focus. You can see the core disappear as we get more and more into focus. 1:20 – core completely disappears (you can’t see it). This means the fiber core is in the focus of the two objective lens 1:23 – bring the fringes back on screen 1:27 – Click “1D fiber measurement” and begin the measurement 1:48 – you can see the fringes scanning down the screen. The computer records the “actual” phase information of the fringes while they scan over the fiber. Inside the machine, there is an interferometer with an adjustable light path length. Note that the physical fiber sample is not moving ! Only the interference arm inside is moving. 2:12 – the fiber is moved away. So now the machine will scan the fringes over an empty screen. This “reference” phase information will be compared to the “actual” phase information. Dr Yablon has a patent for his algorithm that calculates the refractive index based from this raw phase information. 3:17 – measurement done ! Can zoom into the fiber core index profile. You can click on the profile and it will show the value of the refractive index. You can also export into an ascii file for post-processing of the data. But this is not shown.