thorlabs_mc2000b

This is an interface to the Thorlabs MC2000B optical chopper unit, communicating over the USB serial port.

Usage is quite straightforward. For example:

from thorlabs_mc2000b import MC2000B, Blade
# Initialise the first detected device
chopper = MC2000B()
# We'll assume the default MC1F10HP is installed
print(chopper.get_blade_string())
# Set up to use external reference source and the inner part of the blade
chopper.set_inref_string("external-inner")
# Apply a 1/2 divider to the input frequency
chopper.nharmonic = 1
chopper.dharmonic = 2
# Start it up!
chopper.enable = True

# If a different chopper blade is installed, it can be configured by
# using the Blade enum, for example for the MC1F60 model:
chopper.blade = Blade.MC1F60
# This may change the available input and/or output reference sources.
# To check which are available for a blade model:
print(Blade.MC1F60.inrefs)
print(Blade.MC1F60.outrefs)

Information about the unit can be found on the product webpage, and details of the commands and how they apply to the different models of chopper blades can be found in the user manual.