In which portion of the electromagnetic spectrum do diode lasers primarily operate?

Diode lasers primarily operate in the near infrared region of the electromagnetic spectrum. This portion of the spectrum typically ranges from about 700 nanometers (nm) to 2500 nm. The near infrared is particularly significant for many therapeutic applications, including those in laser therapy, because this range of wavelengths is well-absorbed by various biological tissues and can penetrate deeper compared to visible light, allowing for effective treatment of underlying conditions.

The specific properties of diode lasers, such as their ability to be compact, efficient, and precise, make them especially suitable for numerous applications in laser therapy. They utilize semiconductor materials to produce coherent light, and their operation in the near infrared range enhances their effectiveness in medical treatments, as the light can stimulate cellular processes, promote healing, and relieve pain.

The other options, such as visible light, X-ray spectrum, and microwave, do not align with the primary operational characteristics of diode lasers, which focus on near infrared wavelengths to maximize therapeutic benefits.