Alexandrite lasers are a type of solid-state laser that use a crystal made of alexandrite, a rare gemstone. These lasers emit light in the near-infrared spectrum, typically around 755 nanometers, making them effective for various applications, including hair removal and tattoo removal. The unique properties of alexandrite allow for adjustable wavelengths, which can be beneficial for treating different skin types and conditions. Additionally, these lasers are known for their precision and ability to target specific areas without damaging surrounding tissue, making them popular in the field of aesthetic medicine.