Primes HP-MSM-HB, Оригинальное руководство пользователя

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99 Revision 00 EN - 01/2021
HP-MSM-HB
35,0(6
23.1.2 Non rotationally symmetric beams
In order to describe non rotationally symmetric beams, the following parameters are required:
• the z-position of the beam waist (focus) z
x
and z
y
• the diameter of the beam waist d
σ
0x
and d
σ
0y
• the far field divergence angle
Θ
σ
x
and
Θ
σ
y
• the angle
ϕ
between the x´-axis of the measuring system and the x-axis of the beam (the x-axis of the
beam is the one closest to the x-axis of the measuring system.)
Beam coordinate system (x, y)
y-axis
x-axis
x-axis
y-axis
Device coordinate system (x, y)
Fig. 23.2: Beam parameter of the not rotationally symmetric beam
All beams which can be characterized by two axes which are perpendicular to each other can be described
by means of the above mentioned parameters.
Further beam parameter such as the K-figure or the beam propagation factor are calculated directionally by
means of as the same equations as the rotationally symmetric beams. This always results in two parameters
such as Kx and Ky.