Commit c29f099c19a7055661cc59449090c795104a0b79

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1   - GNU GENERAL PUBLIC LICENSE
2   - Version 3, 29 June 2007
3   -
4   - Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
5   - Everyone is permitted to copy and distribute verbatim copies
6   - of this license document, but changing it is not allowed.
7   -
8   - Preamble
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1   -# PM100_waist
2   -
3   -Make your waist measurment easy with a Thorlabs PM100D.
4   -
5   -## Setup
6   -```
7   -==============================
8   -Prepare the setup
9   -==============================
10   -laser PM100D
11   --->------------------] in W
12   - |
13   - |
14   - |
15   -
16   - knife at z and x=0mm
17   -
18   -==============================
19   -move the knife and press enter
20   -==============================
21   -laser PM100D
22   --->-----|------------] in W
23   - |
24   - |
25   -
26   - knife at z and x+=0.05mm
27   -
28   -==============================
29   -```
30   -
31   -## Acquisition
32   -`pm100d_waist.py` acquire the optical power along transverse section at *z* mm.
33   -
34   -Create your measurement folder
35   -`mkdir -p my/best/measurement && cd my/best/measurement`
36   -
37   -Run the acquisition program with the `-o` option to set z=123mm as terminaison of the filename.
38   -All the files will be saved in the current folder
39   -`path/to/the/program/location/pm100d_waist.py -o 123`
40   -
41   -Press *enter* to get a power value, and move the knife of 0.05 mm, repress enter and again and again and again and again and again and again...
42   -When the section is done, enter the new z value in the prompt, the program will inform you that a new file is created.
43   -
44   -At the end, press `CTRL + C` and enter to quit *properly*.
45   -
46   -## Post-processing
47   -`fit_waist.py` fit each waist of each section and compute the *w0* and the *z0* of the beam.
48   -
49   -`./fit_waist.py` will return
50   -
51   -![screenshot](doc/fit_waist.png)
doc/fit_waist.png

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