Determination of Beam Width and Quality for Pulsed Lasers Using the Knife‐Edge Method

Abstract In this work, we present a simple theoretical formalism for beam measurements using the knife‐edge technique, applied to non‐Gaussian laser beams, as well as its application to the characterization of a pulsed laser beam. The beam waist and the M 2 parameter of a laser beam from a home‐made, pulsed, Er:Tm:Ho:YLF laser were determined using this simple and inexpensive method. The obtained values of the M 2 were 6.8 and 9.0, respectively, to x and y directions.