How is wavelength measured?

Wavelength is typically measured in nanometers (nm) when discussing electromagnetic radiation in the visible light spectrum and other forms of light, such as laser light. This unit is especially relevant in the context of lasers, as their wavelengths usually fall within the range of hundreds of nanometers. For example, visible light wavelengths range from approximately 380 nm (violet) to 750 nm (red).

Understanding wavelength in nanometers is crucial for applications in laser therapy, as specific wavelengths correlate with different biological effects and tissue interactions. The precision afforded by using nanometers allows for more accurate calculations and better targeting during laser treatments. While other units like meters or centimeters can measure wavelength, they are not as practical for the specific range of wavelengths typically used in phototherapy, which is why nanometers are the standard unit of measurement in this field.