PH3151 ENGINEERING PHYSICS

Front

Life time of electron in ground state of an atom in seconds

Back

Infinite

Front

Population inversion for Lasing action means

Back

More electrons in metastable state than ground state

Front

According to Einstein at equilibrium

Back

Rate of absorption of radiation is equal to rate of stimulated emission

Front

What happens if an optical resonator is not formed?

Back

Output would be there but would stop very soon

Front

Find the difference between two energy levels of Neon if the transition levels gives a photon of wl 6328 Angstrom.

Back

3.14 X 10-19 J

Front

In Ruby laser optical pumping is done through

Back

external green light

Front

In He-Ne laser, which atoms provide active energy levels for transitions?

Back

Ne atoms

Front

We get continuous laser from: Ruby, Diode, He-Ne, Co2

Back

He-Ne

Front

We get pulse laser from?

Back

Ruby rod

Front

In Physics lab the laser we use is

Back

Diode laser