The Q-switched alexandrite laser is a solid-state laser containing a chrysoberyl crystal of aluminum tetraoxide (BeO:A12Q) doped with chromium ions. The laser has a wavelength of 694nm, a 28 to 40 nsec pulse width (over 108 W/cm2), and injures to a depth of about 1mm into skin. In the Qswitched mode, very high power is achieved by allowing the energy to build up inside the optical cavity. The crystal is surrounded by a helical flashlamp. The Q-switched ruby is composed of a ruby crystal (aluminium oxide), which has a crystal lattice with a chromium impurity inside of it.
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