DIN EN ISO 11146:1999-09

1 Scope
2 Normative references
3 Terms and definitions
4 Coordinate systems
5 Test principles
6 Measurement arrangement and test equipment
7 Beam widths and beam diameter measurement
8 Divergence angle measurement
9 Combined determination of laser beam propagation
      parameters
10 Determination of beam propagation factor and times-
      diffraction-limit factor
11 Test report
Annex A (normative) Alternative methods for beam width
                    measurements
Annex B (normative) Equations for non-circular beams
Annex C (informative) Derivation of equations

Gives methods for the measurement of beam widths (diameter), divergence angles and beam propagation factors of laser beams. Does not apply to highly diffractive beams such as those produced by unstable resonators or passing through hard-edged apertures.