Quiz on Population Inversion and Laser Techniques

What is the definition of Population Inversion?

• When atoms are in thermal equilibrium

• When N2 is far greater than N1

• When both N1 and N2 are equal

• When N1 is greater than N2

Which method uses light to raise electrons to a higher energy level?

• Direct electron excitation

• Chemical reaction

• Optical pumping

• In-elastic atom-atom collision

Who developed the technique of optical pumping?

• Niels Bohr

• Marie Curie

• Albert Einstein

• Alfred Kastler

In which method are electrons directly excited by a gaseous discharge?

• Optical pumping

• Chemical reaction

• In-elastic atom-atom collision

• Direct electron excitation

What is an example of a laser that uses in-elastic atom-atom collision?

• He-Ne laser

• Argon laser

• Ruby laser

• Hydrogen fluoride laser