Matlab code for size vs position and power :
clear all
close all
x = [1820 1820 1925 1936 2117 2260];
y = [2013 2013 2029 2090 2249 2392];
Position = [0 0.2 0.4 0.6 0.8 1];
Trans = [337 330 306 245 128 17]
hold on
[ax,h1,h2] = plotyy(Position,x,Position,Trans)
set(get(ax(1), 'Ylabel'), 'String', 'Beam diameter (um)');
set(get(ax(2), 'Ylabel'), 'String', 'Transmitted power (mW)');
xlabel('Position of the D-shape (mm)')
plot(Position,y,'g')
hold off
| Loïc Amoudry wrote: |
|
Measurement done on 18/10/18.
At high power, the shape of the 0.0 mode does not change. The D-shape only generate losses in the cavity. Then the power stored in the cavity decrease. As with this configuration, the cavity beam size decrease when power increase, the beam size decreased.
Measurements done @4A on 3rd stage.
| x (um) |
y (um) |
Picomotors displacement (um) |
Transmission power (mW) |
| 1820 |
2013 |
0 |
337 |
| 1820 |
2013 |
200 |
330 |
| 1925 |
2029 |
400 |
306 |
| 1936 |
2090 |
600 |
245 |
| 2117 |
2249 |
800 |
125 |
| 2260 |
2392 |
1000 |
17 |
Then we get the D-shape away from the beam to not cut it and decreased the amplifier power to validate the beam size at a known value. So the power as been decreased to 2A (= 125 mW in trans) and the beam size was x=2079 y=2255, similar to the 125 mW with D-shape mirrors values.
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