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Study Notes
- Laser photons are coherent and in phase, leading to a stable beam diameter along its path.
- Laser intensity is constant and not subject to inverse square law.
- Three elements are required to produce a laser: an active medium, a power source, and a resonant cavity.
- The active medium can be gas, solid, or liquid.
- The power source can be electrical, optical, thermal, or chemical.
- The resonant cavity multiplies the laser intensity and can be external or internal.
- Laser beam diameter remains stable along its path due to the coherence of photons.
- Laser intensity is not subject to the inverse square law.
- The active medium determines the wavelength of the laser.
- The resonant cavity is responsible for producing the laser beam.
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