How do I measure the output power correctly?

For measuring the output power please use a calibrated power meter that is rated for use at the specified power of your laser.  Ensure that the wavelength is set according to the value specified in the certificate of conformity and place the power meter in front of the output aperture. Please perform the measurement without any additional optics between the output aperture of the laser head and the power meter.

Related to: ventus/gem/torus/opus/finesse