LASER

Full form of LASER

• Light Amplification by Spontaneous Emission of Radiation

• Light Amplification by Stimulated Emission of Radiation

• Light Attenuation by Stimulated emission of Radiation

• None of the above

Which is not a characteristic of LASER?

• Monochromatic

• Directionality

• Multiple Wavelength

• High Intensity

An electron in ground state is

• unstable

• stable

• fluctuating

• vigorous

The number of atoms per unit volume that occupy a given energy state is called

• population

• meta stable state

• active state

• none of the above

The number of atoms per unit volume that occupy a given energy state is called

• population

• meta stable state

• active state

• none of the above

The type of emission of light on its own is called

• Spontaneous emission

• Stimulated emission

• triggered emission

• none of the above

The active medium in a He-Ne laser consists of:

• Only helium

• Only neon

• A mixture of helium and neon

• A mixture of argon and krypton

Lasers are used in fiber optics communication because they have:

• High divergence

• High coherence

• Low power

• Low efficiency

Which of the following components is NOT essential in a laser system?

• Active medium

• Optical resonator

• Pumping source

• Prism

What is the function of the optical resonator in a laser?

• To amplify the light

• To increase the divergence of the beam

• To confine and reflect light back into the active medium

• To change the wavelength of emitted light