Sapphire Namiki N1 check + Shinkosha S1 - 6 check

Members: Marco Bazzan, Manuel Marchio



After the sample N1 was mounted, a set of measurements was performed, with a pump power of 10.6 W on the sample.

We found that a parasitic reflection from the red probe is propagating back towards the IR line. We fixed the problem by slightly moving the diaphragm in front of the chopper. This does not affect the power measured by the power meter

Calibration with reference sample.
Position of the detection stage: 70 mm
Pump power: 34 mW * sqrt(0.55) = 0.02521 W
Probe Beam alignment: DC probe maximized at 4.85 V
AC signal at scan center = 0.08 V
Z stage alignment: surface peak maximum at Z =38.85

R = AC/DC/Abs/P = 0.63

Sample N1
DC level 4.92 V

P = 10 W (current = 7.5 A)
Power transmitted 9 W
Power incident 10.54W
T=9/10.54=0.854

Previous results confirmed (Fig 1). All OK.

Sample S1 mounted.
Transmitted power = 9 W
Preliminary absorption estimate:
AC/DC/P/sqrt(0.85)/R*3.34= 0.00175/4.25/10/sqrt(0.85)/0.63*3.34 = 237 ppm/cm
but DC was not maximized... to be done again
Figure 2

Sample S2 Mounted
Transmitted power = 9 W
Preliminary absorption estimate:
AC/DC/P/sqrt(0.85)/R*3.34= 0.001/4.95/10/sqrt(0.85)/0.63*3.34 = 116 ppm/cm
Figure 3

Sample S3 Mounted
Transmitted power = 9 W
Preliminary absorption estimate:
AC/DC/P/sqrt(0.85)/R*3.34= 47 - 163 ppm/cm
Figure 4

Sample S4 Mounted
Transmitted power = 9 W
Preliminary absorption estimate:
AC/DC/P/sqrt(0.85)/R*3.34= 81 - 406 ppm/cm
Figure 5

Sample S5 Mounted
Transmitted power = 9 W
Preliminary absorption estimate:
AC/DC/P/sqrt(0.85)/R*3.34= 115 - 287 ppm/cm
Figure 6

Sample S6 Mounted
Transmitted power = 9 W
Preliminary absorption estimate:
AC/DC/P/sqrt(0.85)/R*3.34= 80 ppm/cm
Figure 7