Q.1.
The p-type semiconductor is obtained by doping the intrinsic semiconductor with
Q.2.
How is population inversion achieved in Carbon dioxide laser?
Q.3.
The concept of matter wave was suggested by_________
Q.4.
At 0 kelvin, all the energy levels below fermi level are
Q.5.
Which is NOT a characteristic of a LASER?
Q.6.
Which of the following equation represents Simple Harmonic motion?
Q.7.
At resonance,
Q.8.
Laser is a monochromatic source of light. This means all the light waves have...
Q.9.
In spontaneous emission the incident and emitted waves are...
Q.10.
The resonator consists of ... mirrors at least.
Q.11.
The first laser was built in...
Q.12.
The process in which the electrons in the ground state are vibrated to the excited states by providing extra energy from energy sources is called as
Q.13.
In He-Ne laser active energy levels for transitions are provided by
Q.14.
We get continuous laser from
Q.15.
We get pulse laser from
Q.16.
In Physics lab the laser we use is
Q.17.
Which of the following statements are true?LASER is used as optical source in single mode fibers.LASER lights are highly incoherent.
Q.18.
The coherent nature of light from LASER is due to
Q.19.
Light amplification in LASER is achieved by
Q.20.
Minimum number of energy states required to achieve population inversion is