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Properties of Laser Beam

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Questions and Answers

What is the main purpose of the active medium in a laser system?

To absorb radiation energy

To create population inversion (correct)

To generate the laser beam

To provide a cavity for optical resonation

In a laser system, what is the significance of population inversion?

It increases the number of atoms in lower energy states

It reduces the lifetime of excited states

It ensures more atoms are in a higher energy state than the lower energy state (correct)

It helps in generating optical resonation

Which method is commonly used for pumping action to achieve population inversion in gas lasers?

Optical pumping method

Direct conversion method

Elastic atom-atom collision method

Electrical discharge method (correct)

What type of levels lie in the forbidden gap of the host crystal in a crystal system with impurity atoms?

Metastable levels Signup and view all the answers

What is the role of the optical resonator in a laser system?

To amplify coherent emission Signup and view all the answers

What property of laser light ensures that all the emitted waves are exactly in phase with each other?

Coherence Signup and view all the answers

How does the intensity of laser light compare to ordinary light?

Laser light has higher intensity Signup and view all the answers

Which characteristic of laser light describes its property of energy, frequency, or wavelength nearly being the same for all emitted photons?

Monochromaticity Signup and view all the answers

What did Einstein demonstrate in 1917 regarding the transition processes of absorption, emission, and stimulated emission?

Their rates are mathematically related Signup and view all the answers

Why does laser light have a small wavelength range and higher intensity compared to ordinary light?

Almost all emitted photons have the same energy Signup and view all the answers