1. Gain Medium (e.g., Nd:YAG Rod)
2. Excitation Source (e.g., Arc Lamp
3. Feedback Mechanism (e.g., Mirrors)
4. Output Coupler (e.g., Output Mirrors)
Electrical Power Krypton Arc Lamp
Nd:YAG Crystal
Mirror
External Switch Shutter
Output Lar Power
Mirror
Internal "Q" Switch L A S E R
Light
Radiation
Emission
Stimulated
Amplification
Basic Lar Resonator
Lar Processing Variables
walton
Physical Basics
1 Lar - Physical Basics
1.1 Esntial Basics of Light
Light is electromagnetic radiation = electromagnetic waves,
classified by its
Ø wavelength l oder
Ø frequency n
百度英语词典Ø pha j
Ø amplitude a
dxxØ wave velocity c = ln粗大
1.1.1 Spectrum of visible light:
1.1.2
1.1.3 Monochromatism and coherence
Chromatic light waves
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Monochromatic and incoherent light waves
Monochromatic and coherent light waves
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即时生效1.1.4 Amplification of Light Waves
The amplification of superimposing waves depends strongly on their Ø wavelengths l1, l2, ... and
Ø phas j1, j2, ... or pha difference Dj
Max. amplification is only possible in ca of superposition of
Ø monochromatic waves: l1 = l2
Ø coherent waves: j1 = j2
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