Unified Optical Scanning Technology

Chapter 4.9.2 - Scanner Devices and Techniques: Drive Power

4.9.2 Drive Power

The power dissipated within the electrooptic material is given by

where V is the applied (p-p sinusoidal) voltage in volts, C is the deflector capacitance in farads, f is the drive frequency in Hz, and Q is the material Q-factor (Q = 1/loss tangent).

The capacitance for the transverse electroded deflectors of Figure 4.28 is approximately that for a rectangular parallel-plate capacitor

where κ is the dielectric constant of the material of length L, width Y, and thickness Z.

The characteristics of some electrooptic materials [T&K, Bei2, I&L] are often a strong function of frequency beyond 105Hz. A resolution-speed-power figure of merit has been proposed [Z&L].

 

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