Which type of laser emits the shortest wavelength?

The type of laser that emits the shortest wavelength is the diode laser. Diode lasers typically operate in the range of near-infrared light, often around 800 to 900 nanometers, but can sometimes emit wavelengths even shorter than that in specific configurations. The short wavelength of diode lasers allows for effective targeting of certain tissues and cells during laser therapy applications, making them particularly useful in medical treatments and cosmetic procedures.

In contrast, other types like gas lasers generally emit longer wavelengths, often in the visible range, and solid-state lasers usually emit wavelengths that are slightly longer than those produced by diode lasers. Fiber lasers can be versatile with their wavelengths depending on the fiber material and dopants used, but they typically do not reach the shorter wavelengths that diode lasers can achieve. Thus, diode lasers stand out for their ability to produce the shortest wavelengths among the options provided.