Lasers

Optical fibers are also called

The type of emission of light on its own is called

• Spontaneous emission

• Stimulated emission

• triggered emission

• none of the above

One quantum (small fixied amount) of light energy is called a .........

• Photo

• Proton

• Photon

• Electron

Interaction with light photons is one of the means of supplying energy to electron to undergo transition

• True

• False

An electron in ground state is

• unstable

• stable

• fluctuating

• vigorous

The type of attenuation shown is

• Absorption Loss

• Scattering Loss

• Radiation Loss

• Adsorption Loss

The rate of stimulated emission R_st depends only on ρ(ν)

• True

• False

The picture indicates which property ? 

• Laser is Monochromatic 
• Laser is Coherent
• Laser is Directional 

Find the feature of stimulated emission

• Light attenuation

• Incoherent light

• Light amplification

• Non directional

Which is not a characteristic of LASER?

• Monochromatic

• Directionality

• Multiple Wavelength

• High Intensity