Profile: Gooch & Housego California is a manufacturer of precision optical components and sub-systems, as well as light measurement instrumentation and services, based upon key enabling optical technologies. Our product line includes acousto, electro & precision optics and RF drivers. Our Q-switches are special modulators designed for use inside laser cavities. They have exceptionally low insertion loss, and are able to withstand very high laser powers. In normal use, an RF signal is applied to the Q-Switch, causing it to deflect a proportion of the laser beam. This increases the cavity losses and prevents lasing. When the RF signal is switched off, the cavity losses decrease rapidly, and an intense laser pulse evolves. Our AO modulator is a device that modulates and controls the intensity of an optical beam.