What wavelength range is typically considered appropriate for visible lasers?

The visible spectrum for light that is perceivable by the human eye typically ranges from approximately 400 to 700 nanometers. This range includes all the colors that humans can see, such as violet, blue, green, yellow, orange, and red. Lasers that operate within this wavelength range can be employed in a variety of applications including medical treatments, cosmetic procedures, and even in imaging technologies because they are well within the limits of human vision.

The other wavelength ranges mentioned are outside the visible range. The range of 300-400 nanometers falls into the ultraviolet spectrum, which is not visible to the human eye and can cause skin damage. Similarly, wavelengths from 700-1000 nanometers fall into the infrared spectrum, which is also invisible to the human eye and primarily used in thermal imaging and other applications that do not require visible light. The 1000-1500 nanometer range is primarily within the near-infrared, which, again, is invisible and has applications focused on specific technologies that utilize infrared radiation, such as telecommunications or certain types of laser treatments that require deeper tissue penetration without being visible to the eye.

Thus, the choice of 400-700 nanometers accurately reflects the range of visible light, aligning