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WorksheetsLASER basics
Total questions: 13
Worksheet time: 11mins
LASING action depends on
Spontaneous emission
Stimulated emission
Spontaneous emission followed by stimulated emissions
Absorption of radiation
According to Einstein at equilibrium
Rate of absorption of radiation is equal to rate of stimulated emission
Rate of spontaneous emission is equal to rate of stimulated emission
Rate of absorption of radiation is equal to rate of spontaneous emission
Rate of stimulated emission is constant
Life time of electron in ground state of an atom in seconds
0
equal to half life period
1
Infinite
Population inversion for Lasing action means
More electrons in ground state than excited state
More electrons in any excited state than ground state
More electrons in 1st excited than ground state
More electrons in metastable state than ground state
Metastable state is
The ground state
Any excited state
an excited state with relatively larger life time
an excited state with relatively smaller life time
If optical resonator is not formed
No output in laser would be there
Output would be there but would stop very soon
Intensity can't grow
No laser would be produced at all
Find the difference between two energy levels of Neon if the transition levels gives a photon of wl 6328 Angstrom.
3.14 X 10-19 J
3.14 J
3.14 x 10-12 J
1.96 J
In Ruby Laser the active energy levels are provided by
Aluminimum
Cromium
Both Al2O3 and Cr3+
by oxygen layers
In Ruby laser optical pumping is done through
external green light
electric discharge
by heating the system
external red light
In He-Ne laser active energy levels for transitions are provided by
Ne atoms
He atoms
Both He and Ne
Co2 atoms
We get continuous laser from
Ruby
Diode
He-Ne
Co2
We get pulse laser from
Ruby rod
He, Ne laser 10:1 ratio
CO2 laser
Diode laser
In Physics lab the laser we use is
He-Ne laser
Ruby laser
Diode laser
Co2 laser
