Acousto-Optic Q-switch

- Q-switches are intracavity devices used to generate very high peak power, short duration laser pulses.

- These are typically loss modulators operating on the zero order beam.

- The goal of a Q-switch is to diffract as much power from the zero order as possible to increase the cavity loss and extinguish the laser output. When the RF drive to the Q-switch is momentarily turned off, the optical power built up in the laser is emitted as a short pulse.

- The process may be repeated at rates in excess of 100KHz.

- Depending on the frequency and interaction length, AO Q-switches either operate in the Bragg regime, just like an AOM, with predominately a single diffracted beam or in the Raman-Nath regime with multiple diffracted beams.

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