Laser Quiz

CO2 laser is a type of

• Doped insulator laser

• Solid state laser

• Molecular gas laser

• Chemical laser

The type of pumping used in CO2 laser is

• Electrical pumping

• Optical pumping

• Chemical pumping

• X-ray pumping

The type of gases used in CO2 laser is

• N2, He, C

• N2, He, CO2

• N2, H, C

• Both b & c

The laser beam is

• Monochromatic

• Polychromatic

• Incoherent

• Low intensity

Laser action is achieved when*

• The number of atoms in the excited state is less

• It has normal population

• It has population inversion

• It has absorption

In order to achieve laser action*

• Absorption must be greater than emission

• Spontaneous emission must be predominant over stimulated emission

• Stimulated emission must be predominant over spontaneous emission

• None of the above

Principle of laser is

• Spontaneous absorption

• Stimulated emission

• Induced emission

• Both c & d

The artificial method of producing population inversion is called*

• Resonator

• Stimulated emission

• Active medium

• Pumping

In an optical resonator the active medium is placed*

• At the end of reflecting surfaces

• In between the reflecting surfaces

• Away from the reflecting surfaces

• Closer to the reflecting surfaces

The optical resonator produces*

• Refraction of the beam

• Multiple reflection of the beam

• Transmittance of the beam

• Both (a) & (b)