EXPERIMENT NO. 2
LENS-PINHOLE SPATIAL FILTERS AND BEAM EXPANDERS
To study the operations of beam expanders and lens-pinhole spatial filters and to
practice alignment of simple optical components.
C. L. Chen,
, Irwin, (1996), Sections 2.4
and 2.8, pp. 49-55 and 68-74.
2. A. Nussbaum and R. A. Philips,
Contemporary Optics for Scientists and Engineers
Englewood, NJ (1976), Chapter 10.
, Addison-Wesley, 4th edition, (2002), Chapter 11.
F. L. Pedrotti and L. S. Pedrotti,
Introduction to Optics
Second edition, Prentice
Hall, (1993), Section 16-3.
B. J. Pernick, "Irradiance uniformity and power loss with a spatially filtered
Rev. Sci. Instrum
., Vol. 45, pp. 1344-47, (1974).
Notes on "Autocollimation of convex lens." (Attached)
M. E. Cox, "The lens-pinhole spatial filter,"
, Vol. 14, pp. 56-
J. M. Yaeli, "Method for designating the optical axis of a refracting system,"
, Vol. 19, pp. 438-439 No. 3, (1980)
The beams emitted by typical HeNe lasers may be approximated accruately as
A detailed discussion of the properties of Gaussian beams can be
found in Section 2.4 of Ref. . We briefly discuss the key properties of Gaussian beams
here. The irradiance distribution of a Gaussian beam is:
where I(r,z) is the irradiance (W/m
) at a distance r from the beam axis and at a
distance z from beam waist,
is the total beam power (W), and w(z) is the beam
radius at which the irradiance reduces to e
of the on-axis value. The beam diameter at