Which type of laser is classified as Class 4?

The classification of lasers primarily revolves around their power output and potential hazards. Class 4 lasers are high-powered lasers that present serious risks not only to the eyes but also to the skin. These lasers can potentially cause burns and can initiate fires upon contact with flammable materials.

High-powered lasers generally operate above 500 mW (milliwatts) and can have various applications, including medical and industrial uses. Due to their power and the associated risks, they require stringent safety measures, including protective eyewear and controlled environments during use.

In contrast, low-powered lasers, which are typically classified as Class 1 or Class 2, do not pose these significant hazards. Medium-powered lasers can be classified as Class 3A or 3B but do not reach the power output and associated risks of Class 4. Ultraviolet lasers do not contribute to the classification's power spectrum but fall under specific wavelength categorizations. Thus, the classification of high-powered lasers as Class 4 is accurate and reflects their inherent risk levels.