PM100_waist

Make your waist measurment easy with a Thorlabs PM100D.

Setup

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Prepare the setup
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laser             PM100D
-->------------------] in W
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 knife at z and x=0mm

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move the knife and press enter
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laser             PM100D
-->-----|------------] in W
        |
        |

 knife at z and x+=0.05mm

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Acquisition

pm100d_waist.py acquire the optical power along transverse section at z mm.

Create your measurement folder mkdir -p my/best/measurement && cd my/best/measurement

Run the acquisition program with the -o option to set z=123mm as terminaison of the filename. All the files will be saved in the current folder path/to/the/program/location/pm100d_waist.py -o 123

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... When the section is done, enter the new z value in the prompt, the program will inform you that a new file is created.

At the end, press CTRL + C and enter to quit properly.

Post-processing

fit_waist.py fit each waist of each section and compute the w0 and the z0 of the beam.

./fit_waist.py will return