Tip:
Highlight text to annotate it
X
Performing a filter measurement. Here, I’ve connected a broadband optical source to the
OSA. You can see the wide wavelength range that the source covers. You can see, if you
zoom into certain wavelength regions, you can see absorption by water lines. I’m now
going to put a filter into the optical path and see how the spectrum changes.
With the filter in the optical path, we see a completely different spectrum. We see the
transmission of this filter at 1.6 microns, and a little bit of transmission at higher
wavelengths. I’m going to set this to average to get a nice transmission measurement. I
can change Trace C to calculate the measured transmission. I get a characterization of
the filter. I can hide the other traces to only display the transmission spectrum. If
I set this as the active trace, we can perform Peak Track Analysis. We get the full width
half maximum of the transmission of the optical filter, and the center wavelength of the transmission.
We can also calculate absorbance, and we quickly get an absorbance spectrum.