Basic Laser: Physics and Safety

  • Holly H. Hare
  • Ronald G. Wheeland


Light is a very complex system of radiant energy that is composed of waves and energy packets known as photons. It is arranged into the electromagnetic spectrum (EMS) according to the length of those waves. The distance between two successive troughs or crests of these waves, measured in meters, determines the wavelength. For the visible portion of the EMS, the wavelength determines the color of the laser light. The number of wave crests (or troughs) that pass a given point in a second determines the frequency for each source of EMS energy. The wavelength and frequency of light are inversely related to one another. Thus, shorter wavelengths of light have higher frequencies and more energenic photons than longer wavelengths of light which have lower frequencies and less energenic photons.


Optical Cavity Intense Pulse Light Thermal Relaxation Time Pockels Cell Port Wine Stain 
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Future Readings

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Department of Dermatology, Mohs and Dermatologic Surgery at College Park Family Care Specialty CenterUniversity of Kansas Medical CenterOverland ParkUSA
  2. 2.Consultant in Mohs and Laser SurgeryTusconUSA

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