Which type of wavelengths can lasers operate on?

Lasers have the capability to operate across a broad spectrum of wavelengths, which is defined as ranging from 180 nanometers (nm) to 1 millimeter (mm). This range encompasses several regions of the electromagnetic spectrum, including ultraviolet, visible, infrared, and microwave wavelengths.

The flexibility in wavelength operation is essential because different applications require different wavelengths to achieve specific therapeutic effects. For example, shorter wavelengths, like those found in the ultraviolet range, are often used for cutting and ablation, while longer wavelengths in the infrared range are widely used for therapeutic purposes such as pain relief, tissue repair, and inflammation reduction. The ability to operate over such a wide range allows for a variety of medical and industrial applications, making the laser a versatile tool in many fields.

In contrast, the other options are too restrictive. The mention of only infrared wavelengths or only visible wavelengths limits the operational spectrum and does not reflect the full capabilities of laser technology. Additionally, wavelengths ranging between 100 nm and 200 nm are not representative of the broader capabilities of all lasers. Therefore, the correct understanding is that lasers can function across an extensive range of wavelengths, specifically from 180 nm to 1 mm.