Which class of lasers produces visible and near infrared light?

The correct answer is based on the characteristics of different classes of lasers and their light emission properties. Class 3 lasers are known to encompass both visible and near-infrared light wavelengths, which are crucial for various applications, including those in medical and aesthetic fields.

Class 3 lasers can be further categorized into Class 3R and Class 3B, with Class 3B typically producing a higher level of output and being utilized for more intense applications. The visible range of light typically falls within 400 to 700 nanometers, while the near-infrared range extends from approximately 700 nanometers to 1400 nanometers. Since Class 3 lasers can generate light in both of these ranges, they are versatile tools for practitioners who use lasers for therapeutic or cosmetic purposes.

In contrast, Class 1 lasers emit light that is not hazardous during normal operation, typically at levels well below what would be visible or applied in practical laser therapies. Class 2 lasers emit visible light but are limited in terms of power, making them less effective for many professional uses. Class 4 lasers are much more powerful and can also produce visible and infrared light, but they are classified primarily due to their potential hazards and are governed by stricter safety