Ultraviolet lasers are a type of laser that emits light in the ultraviolet spectrum, which is invisible to the human eye. They typically operate at wavelengths shorter than visible light, ranging from about 10 to 400 nanometers. These lasers are used in various applications, including medical treatments, scientific research, and industrial processes. One common use of ultraviolet lasers is in photolithography, a technique essential for manufacturing semiconductors and microchips. Additionally, they are employed in sterilization processes, as their high energy can effectively kill bacteria and viruses, making them valuable in healthcare and sanitation.