FIBER COUPLED AOM USER MANUAL
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PEC 0205 Issue 1
As part of our policy of continuous product improvement, we reserve the right to change specifications at any time.
May 2017
Page 1
FIBER COUPLED AOM USER MANUAL
FIBER-Q®
APPLICATION NOTE
This short document provides some basic information on using and the G&H Fiber-Q®. Should
you need further details please contact us and we will be happy to help.
Basic Principle:
A radio frequency (RF) signal applied to the piezoelectric transducer generates a travelling
acoustic wave in the bulk material. This acoustic wave produces a refractive index ‘grating’.
Incident light is diffracted from this grating.
The amplitude (intensity) of this diffracted light may be controlled by adjusting the applied RF
power.
The acousto-optic interaction also generates an inherent frequency shift (Doppler Effect), such
that the diffracted light has frequency = incident light + RF drive frequency as indicated in the
diagram.
Acoustic Transducer
Acoustic Waves
Carrier Frequency f
Diffraction order
(frequency F + f)
Input light
(Frequency F)
0 order (Frequency F)
