What is beam divergenceof laser

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Monochromaticityof laser

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Componentsof laser

Ordinary light spreads in all directions and its angular spread is 1m/m. But it is found that laser is highly directional and is angular spread is 1mm/m. For example, the laser beam can be focused to very long distance with a few divergence or angular spread.

Since an ordinary light spreads in all directions, the intensity reaching the target is very less. But in the case of laser, due to high directionality, the intensity of laser beam reaching the target is of high intense beam. For example, 1 mill watt power of He-Ne laser appears to be brighter than the sunlight.

Usesof laser

Laser is a device which emits a powerful, monochromatic collimated beam of light. The emitted light waves are coherent in nature.

It is an important characteristic of laser beam. In lasers the wave trains of same frequency are in phase, the radiation given out is in mutual agreement not only in phase but also in the direction of emission and polarization. Thus it is a coherent beam. Due to high coherence it results in an extremely high power.

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Laser beam is highly monochromatic; the wavelength is single, whereas in ordinary light like mercury vapour lamp, many wavelengths of light are emitted.

Where d1 , d2 are any two distances for the laser source emitted and r1, r2 are the radii of the beam spots at a distance d1, and d2respectively as shown

Coherenceof laser

Characteristics of laser lightin physics

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Characteristics of laserPDF

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