Photodisruption

Photodisruption is a physical process that occurs when high-intensity laser light is focused onto a small spot within a transparent material, causing the material to break down or "disrupt". This process is used in a variety of medical and industrial applications.

Mechanism

Photodisruption occurs when the intensity of the laser light exceeds a certain threshold, causing the electrons in the material to become highly excited and leave their atomic orbitals. This creates a plasma of free electrons and ionized atoms, which expands rapidly and causes a shock wave that disrupts the material.

The threshold for photodisruption depends on the wavelength and pulse duration of the laser light, as well as the properties of the material. Shorter wavelengths and shorter pulse durations generally result in a lower threshold.

Applications

Photodisruption is used in a variety of medical and industrial applications. In medicine, it is used in laser surgery to cut or ablate tissue, particularly in the eye. For example, it is used in LASIK surgery to reshape the cornea and improve vision, and in cataract surgery to break up the cloudy lens.

In industry, photodisruption is used to cut or drill glass, ceramics, and other transparent materials. It is also used in laser engraving to create detailed patterns or images on the surface of a material.

See also

• Laser surgery
• LASIK
• Cataract surgery
• Laser engraving