What type of lasers emit invisible ultraviolet light that triggers a photochemical reaction on target tissue?

• A. CO² lasers
• B. Excimer or halide lasers
• C. Diode lasers
• D. Solid-state lasers

Answer: (B)

The correct response highlights the unique functionality of Excimer or halide lasers, which are designed to emit ultraviolet light that is commonly invisible to the human eye. This characteristic allows them to produce a specific wavelength of light that effectively triggers photochemical reactions in biological tissues. These photochemical reactions are critical in various medical applications, particularly in procedures such as refractive eye surgeries, where precise tissue ablation is required.

Excimer lasers operate by combining reactive gases, such as xenon and fluorine, and are particularly effective because they do not produce heat in the surrounding tissue, minimizing damage to adjacent areas. This precision allows for enhanced outcomes during surgical procedures.