EXPERIMENT NO. 6
To study the operation and characteristics of electrooptic (EO) modulators and to
illustrate their use in engineering applications.
C. L. Chen,
Irwin, (1996), Ch. 6.
F. A. Jenkins and H. E. White,
Fundamentals of Optics
, 4th edition, McGraw-Hill
Book Company, (1976), Sections 25.1, 25.5, 27.5 and 27.6 and Table 27A.
A. Nussbaum and R. A. Phillips
Contemporary Optics for Scientists and Engineers
Prentice Hall, (1976), Sections 13.2 to 13.9.
V. K. Vats and G. Miles, "Introduction to Crystal Polarizers:matching a type to an
, (Oct. 1977), pp. 80-82. (attached)
Specifications for the EO modulator (Conoptics, Inc., Model 370) and a linearly
polarized laser (Melles Griot, 05LHP141, 4 mW).
The electrooptic (EO) modulator (Model 370, Conoptics, Inc.) used in the experiment
is a transverse EO modulator with four ADP crystals.
A polarizer is also attached to the
modulator. The polarizer transmission axis is at 45° relative to the ADP crystals.
polarizer is already attached, the only alignment required is to orient the modulator/
polarizer combination with respect to the linearly polarized light. Note that a polarizer is
often referred to as an analyzer if it is at the output end of a device.
Arrange the optical components shown in Figure 1
the EO modulator and
The HeNe laser tube is rotated so that the fields of the linearly
polarized light beam are horizontal with respect to the optical bench.
A linear polarizer
and/or a half-wave plate may be used to accomplish this task.
Measure the light power
) of the linearly polarized beam.