the Q-switch is an externally controlled variable attenuator. This may be a mechanical device such as a shutter, chopper wheel, or spinning mirror/prism placed inside the cavity, or (more commonly) it may be some form of modulator such as an acousto-optic device, a magneto-optic effect device or an electro-optic device — a Pockels cell or Kerr cell.
Can be development by elongated the EO-crystal and minimizes the influences of the pizooptic influences.fir this it can be used two or three crystal optically in series and parallel electrically. More details see the reference:-
Raad. Sh. Alnayli, Development of electrooptical Q switches and light shutters for high powers solid state lasers, Ph. D dissertation, Hungarian Academy of Sciences, Budapest(1990)
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