I made maps of the LMA surface sample with
High resolution 70 micron of spacing (as the dimension of the pump beam).
Calibration factor used R=13 1/W.
Scan areas are 4mm x 3mm.
LMA sample 15034
nominal absorption = 0.65ppm
pump power = 6.3W
map mean = 5ppm (including very high spiky noise or dust or scratch)
most of area value = 0.85ppm
LMA sample 15032
nominal absorption = 4.5ppm
pump power = 3.36W
map mean = 17ppm (including very high spiky noise or dust or scratch)
most of area value = 5.4ppm
LMA sample 15033
nominal absorption = 12.8ppm
pump power = 1.18W
map mean = 20ppm (including very high spiky noise or dust or scratch)
most of area value = 14ppm
I made again a map of the same area of the LMA sample 15034. In the same conditions. I didn't unmount the sample from the holder, but I noticed that after one week it was dusty. So I cleaned it again with the first contact polymer. I show the picture of before and after cleaning. I show the comparison of the same measurement in the same conditions but after a week and a cleaning.
