Principle Of Nd:yag Laser Treatment - Zeiss VISULAS YAG III Mode D'emploi

Description
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Principle of Nd:YAG laser treatment

The VISULAS YAG III is an ophthalmic therapy laser system for non-
contact incision of ocular tissue.
The radiation is generated by a Q-switched Nd:YAG laser, which emits
pulses of typically 4 ns duration and a maximum energy of
approximately 10 mJ at a wavelength of 1,064 nm. At the focus of the
laser beam, a plasma is created which is at a high pressure and
temperature, but is spatially confined. This phenomenon is termed
optical breakdown or photodisruption. The plasma expands, thereby
cooling rapidly, such that there is no thermal effect on the tissue.
However, the mechanical stress due to the shock wave accompanying
the expansion of the plasma results in an incisional effect.
Fig. 14 Principle of photodisruption using the Nd:YAG laser
000000-1354-664 VISULAS YAG III 15.08.2005