LASERs & Optical Fibres

The Full of LASER

• Light Amplitude by Stimulated Emission of Radiation

• Light Amplification by Stimulated Emission of Radiation

• Light Amplification by Spontaneously Emission of Radiation

• NONE

The Life time of an atom in Metastable state is

• 10^-8 sec

• 10^-7 sec

• 10^-10 sec

• 10^-3 sec

Population Inversion is depicted well with

• N2=N1

• N1>N2

• N2>N1

• N1=N2

Length of the resonance cavity in terms of wavelength is equals to

• Integer multiple of half of the wavelength

• Integer multiple of the wavelength

• Half of the wavelength always

• Three times the wavelength always

Which of the following LASERs is high power LASER

• DIODE LASER

• He:Ne LASER

• Semiconductor LASER

• Nd:YAG LASER

The refractive index of a cladding with respect to core is...

• Equal to

• Greater than

• Less than

Principle of working of Optical Fibre is

• Total Internal Reflection of Light

• Refraction of Light

• Reflection of Light

• Scattering of Light

Which of the following is suitable for single mode of transmission of signal?

• Step Index Fibre

• Graded Index Fibre

Tick all correct formula of Numerical Aperture

V<2.405 is for which fibre

• Single Mode Fibre

• Multimode Mode Fibre