Abstract
In this paper, we propose an adjustable aperture based on the
phase modulation of a spatial light modulator (SLM). Two polarized
beam splitters (PBSs) are used to control the polarized light and
one SLM is used to modulate the phase of the polarized light. A specific
grayscale is produced, where the middle grayscale is with phase of
0 and the other is with phase of
$\pi$
. When the light passes through
the first PBS and the SLM, the polarized state of p-light is changed to s-light by the grayscale with phase
of
$\pi$
, so only middle light can pass through the second PBS and
is detected by the camera. By controlling the size of the middle grayscale
with phase of 0, the device can realize the function of adjustable
aperture. Our experiment shows that the aperture can be tuned between
0 and full size, meaning that it can reach the fully open and closed
state. The results verify its feasibility. The adjustable aperture
has wide applications in imaging system, fiber-optic communication,
and photonic signal processing.
© 2015 IEEE
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