| http://www.w3.org/ns/prov#value | - The intensity of the laser beam 2 is modulated by the modulator 4 which in this embodiment is an acousto/optical modulator such as a Spectra Physics model LGS 100-5B. The amplitude-modulated beam 5 is then focused into a converging beam 12 by a Cassegranian type reflective optical system 6 such as Spectra Physics model ADS 100-6.
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