Deflectors
A Bragg configuration gives a single
first order output beam, which intensity is directly linked to the
power of RF control signal, and which angle is directly
linked to the RF frequency. By varying the frequency, the output laser
beam angle is modified. A deflector is used to scan a laser beam over a
range of angles, or to control with accuracy the output angle of the
laser beam.
The main parameters to qualify a deflector are:
- 1.Deflection angle range and
- 2.Resolution.
The deflection angle range is the maximum angle variation of the laser
beam : it is linked to the frequency range of the device. The
resolution of a deflection is the number of distinct directions which
can be addressed by the deflector : it is linked to the defle ct ion
angle range and laser divergence. Two deflectors can be used in series
and at right angles to give full two-dimensional scanning.