Corundum - Al₂O₃

What's going on here? Are these ruby laser fluorescence peaks?


Ruby
Mysore, India



Synthetic ruby boule showing Cr₂O₃ doping (701 and 704nm lines):




Sapphires are showing two pairs of peaks:


Sapphire 1
West Fork Rock Cr., Granite Co., Montana


Sapphire 2
West Fork Rock Cr., Granite Co., Montana



Sapphire 3
Madagascar


The S7031 CCD used on the Labram has an anti-reflection coated sapphire window.

I did a spectrum on a first-surface mirror to get the laser line.
and found a second laser line is visible in the anti-Stokes region.



The laser lines are offset by 11.1nm... which happens to be 
the same offset for the two pair of sapphire peaks.
The two laser lines seem to be causing two sets of fluorescence peaks...

Onigoroshi- Ghostbusting the Spectres in the Spectrum
12:09 PM 9/28/2018

  This problem is apparently resolved by flushing the CCD with a dark scans.
  Successive frames were "storing" the images of previous frames.
  The number of dark scans needed to completely blank out the CCD
  and get rid of all the ghosts from previous scans depends on the 
  exposure setting. 

  Who says spectroscopy can't be existentially enlightening?