Infrared Visible Light Ultraviolet X-rays Gamma Rays.

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Presentation transcript:

Infrared Visible Light Ultraviolet X-rays Gamma Rays

Radio Light Microwaves Previous Slide

The Visible Spectrum 400nm 500nm 600nm 700nm Wavelength means COLOR

Speed, Wavelength, Frequency c =  f

Properties of Light Speed (c) Wavelength () Frequency (f) Nothing travels faster Absolute constant Wavelength () Gamma rays, X-rays, UV, Visible, IR, Radio In visible wavelength means color Frequency (f) Number of complete waves per second Energy of a Photon (E) E = hf

Light Amplification by Stimulated Emission of Radiation

Spontaneous Emission Energy Levels Photon

Stimulated Emission and Absorption

Population inversion

Some lasers in medical use CO2 10.6 micron Er:YAG 2.94 miron Ho:YAG 2.1 micron Nd:YAG 1064 nm Ar 488/514 nm Kr 647 nm Cu vapour 511/578 nm Dye eg 630/675 nm Diode eg 600 / 905 nm Excimer > 350 nm

Boxes

Laser/Tissue interaction Absorption Scatter Refraction