- Acousto-optic modulators (AOM) are used to control laser beam intensity.

- This can be simple ON:OFF modulation for fast switching or variable level modulation to provide proportional intensity control.

- These modes are determined by the RF driver type; digital or analog modulation respectively (or a combination of both).

- The RF drive frequency is typically fixed and the RF amplitude is modulated accordingly.

- The optical rise and fall time is defined by the laser beam diameter in the AOM and the crystal acoustic velocity.

- For high modulation rates, the beam will need to be focused at the AOM.

Acousto-optics: Solid State Laser Beam Control

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