
DIFFRACTION 253
x, Location
h, Fill factor
−0.5 0 0.5
0.5
1
1.5
2
1
2
3
4
5
(A)
f
x
, Spatial frequency
h, Fill factor
−2 0 2
0.5
1
1.5
2
40
50
60
70
(B)
−1
0
1
0
1
2
0
5
10
h, Fill factor
x, Location
Field
(C)
−5
0
5
0
1
2
−5000
0
5000
h, Fill factor
Spatial frequency
Field
0
500
1000
1500
(D)
(E)
0 0.5 1 1.5 2
1
2
3
4
h, Fill factor
Null locations
(F)
0
1
2
1500
2000
2500
3000
3500
h, Fill factor
Axial irradiance
Figure 8.11 The Gaussian beam in an aperture. (A, C) A finite aperture of diameter, D
is illuminated with a Gaussian beam of diameter hD producing (B, D) a diffraction pattern.
The top two panels show irradiance as a function of x on the horizontal and h on the verti-
cal. The next two show the field. (E) The