VAPORIZATION:
High-power lasers, such as carbon dioxide (CO2) lasers and neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers, can vaporize tissue instantly, creating a clean, precise cut with minimal collateral damage. The laser's intense energy causes the water molecules in the tissue to rapidly vaporize, resulting in explosive vaporization and tissue removal.
NONLINEAR OPTICAL ABSORPTION:
Some lasers, such as pulsed lasers, can rely on nonlinear optical absorption mechanisms to cut through tissue. These lasers emit short, high-intensity pulses that can cause multi-photon absorption or ionization in the tissue. This process leads to a localized heating and subsequent tissue disruption.
PHOTOCOAGULATION:
This process involves using lasers to heat and seal blood vessels, thereby minimizing blood loss and tissue damage. Laser coagulation is commonly used in surgical procedures to achieve hemostasis (control of bleeding) and to coagulate tissue for precise dissection and removal.
PHOTODISRUPTION:
Ultrashort pulsed lasers, such as femtosecond lasers, can induce photodisruption, a process where intense laser light generates shock waves that mechanically disrupt the molecular structure of the tissue. This disruption leads to extremely precise and controlled tissue separation, often at the cellular level.
CAVITATION:
Certain laser wavelengths can induce cavitation, the formation and collapse of gas bubbles within the tissue. This bubble formation and collapse create a mechanical effect that can lead to tissue disruption and cutting.
It's important to note that the choice of laser for a specific cutting application depends on several factors, including the desired precision, depth of cut, tissue type, and potential for collateral damage. Additionally, the safety of laser cutting in medical applications requires specialized training, protective measures, and adherence to laser safety protocols to minimize risks to both patients and practitioners.
