Lesson 1, Topic 1
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History

admin July 21, 2020
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WHAT IS A LASER?

  • Acronym for LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION
  •  A laser is a device that emits a beam of coherent light through an optical amplification process. 


HISTORY OF LASERS

The discovery of lasers is based on the accumulation of research of many scientists. 

Max Carl Ernst Ludwig Plank (early1900s) 

  • He speculated the relationship between energy and radiation and theorized energy travels in small chunks known as quanta. His work lead the foundation for Einstein’s Quantum Theory. 

 

Einstein’s Quantum Theory of Radiation (1917) 

  • Root of technology is based on Einstein’s fundamental physics research of Stimulated Emission of radiation.
  • This describes any device that creates and amplifies a narrow, focused beam of light whose photons are coherent. 
  • Einstein’s theory of  stimulated  emission was a way of explaining  how electricity is generated  from sunlight.  He did not propose the idea of lasers.

 

Charles Townes and Arthur Schawlow (1958)

Invented the MASER – Microwave Amplification by stimulated emission of radiation. They theorized the invention of an “Optical Masers” which would use infrared and/or visible light. 

Theodore Maiman (1960) 

  • Developed the first laser using a synthetic ruby crystal
  • His invention led to subsequent development of many other types of lasers 

 

LASER HAIR REMOVAL

Laser hair removal is a non-invasive procedure which uses concentrated beam of light in order to remove unwanted hair.  In order to achieve desired results, a series of treatments are essential followed by periodic maintenance. The number of treatments required varies from person to person. Certain areas may require more treatments compared to others. 

 

 

HOW DOES A LASER WORK?

  • Lasers use concentrated rays of light to destroy growth cells of the hair bulb. 
  • A laser beam is emitted on the skin to damage hair follicles
  • Lasers for hair removal are considered Semi-Permanent because the hair bulb is not always destroyed, causing regrowth in certain areas.  
  • Approximately 50-60% hair reduction can be seen after 12 weeks. 

 

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