ISO 11146-1:2005 pdf download.Lasers and laser-related equipment —Test methods for laser beam widths, divergence angles and beam propagation ratios 一 Part 1: Stigmatic and simple astigmatic beams.
extent of a power density distribution in a cross section of the beam at an axial location = along that principal axis which is closer to the x- or i-axis of the laboratory coordinate system, respectively, based on the centered second order moments of the power density distribution
NOTE 1 If the principal axes make the angle &4 with the x- and -axes of the laboratory coordinate system, then drn is by convention the larger beam wiclth
NOTE 2 This definition differs from that given in ISO 11145:2001, subclause 352. where the beam widths are defined only in the laboratory system, whereas for the purposes of this part of ISO 11146 the beam widths are defined in the principal axes system.
3.6
ellipticity of a power density distribution
ratio between the minimum and maximum beam widths
3.7
circular power density distribution
power density distribution having an ellipticity greater than 0,87
3.8
beam diameter
d
extent of a circular power density distribution, based on the second order moments
3.9
stigmatism
property of a beam having circular power density distributions in any plane under free propagation and showing power density distributions after propagation through a cylindrical lens all having the same or azimuthal orientation as that lens
3.10
simple astigmatism
property of a non-stigmatic beam whose azimuth angle shows a constant orientation under free propagation, and which retains Its original orientation after passing through a cytindñcal optical element whose c1indrIcal axis is parallel to one of the principal axes of the beam
NOTE The principal axes of a power density distribution corresponding to a beam with simple astigmatism are called the principal axes of that beam.
general astigmatism
property of a beam which is neither stigmatic nor simple astigmatic
NOTE This part of ISO 11146 deals only with stigmatic and simple astigmatic beams. Refer to ISO 11146-2 for general astigmatic beams.
NOTE 1 If the principal axes make the angle &4 with the x- and -axes of the laboratory coordinate system, then drn is by convention the larger beam wiclth
NOTE 2 This definition differs from that given in ISO 11145:2001, subclause 352. where the beam widths are defined only in the laboratory system, whereas for the purposes of this part of ISO 11146 the beam widths are defined in the principal axes system.
3.6
ellipticity of a power density distribution
ratio between the minimum and maximum beam widths
3.7
circular power density distribution
power density distribution having an ellipticity greater than 0,87
3.8
beam diameter
d
extent of a circular power density distribution, based on the second order moments
3.9
stigmatism
property of a beam having circular power density distributions in any plane under free propagation and showing power density distributions after propagation through a cylindrical lens all having the same or azimuthal orientation as that lens
3.10
simple astigmatism
property of a non-stigmatic beam whose azimuth angle shows a constant orientation under free propagation, and which retains Its original orientation after passing through a cytindñcal optical element whose c1indrIcal axis is parallel to one of the principal axes of the beam
NOTE The principal axes of a power density distribution corresponding to a beam with simple astigmatism are called the principal axes of that beam.
general astigmatism
property of a beam which is neither stigmatic nor simple astigmatic
NOTE This part of ISO 11146 deals only with stigmatic and simple astigmatic beams. Refer to ISO 11146-2 for general astigmatic beams.
