Lasers and Optical Fibres

Which is not a characteristic of LASER?

• Monochromatic

• Directionality

• Multiple Wavelength

• High Intensity

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NGSS.HS-PS4-3

Radiation interacts with matter in how many ways

• 2

• 3

• 0

• 1

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NGSS.HS-PS4-3

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Helium-Neon LASER is a:

• Gas LASER

• Liquid LASER

• Solid LASER

• Plasma Laser

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NGSS.HS-PS4-5

The population inversion in semiconductor LASER is acheived by:

• Polishing opposite surfaces

• Applying electric current

• Adequate doping

• Heating to high temperature

Holograms can be prepared using:

• Solar Radiation

• LASER

• Xenon Lamp

• Sodium Vapour Lamp

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NGSS.HS-PS4-1

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The ratio of the refractive index difference of the

core and cladding to the refractive index of core of an optical fiber

• Fractional Index Change

• V-Number

• Numerical Aperture

• Acceptance Angle

Which of these types of optical fibers is almost impossible to manufacture?

• Single mode, step index OFC

• MUlti mode, Step index OFC

• Single mode, graded index OFC

• Multi mode, graded index OFC

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NGSS.HS-PS4-5

Optical fibers are also called

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NGSS.HS-PS4-3

NGSS.HS-PS4-5

The condition for propagation of light in optical fibers is

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NGSS.HS-PS4-5

The schematic represents

• Graded index optical fibre

• Step index optical fibre

• Single mode optical fibre

• Dual optical fibre

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NGSS.HS-PS4-3

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