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Laser and Optical Fiber Syllabus

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Questions and Answers

What is the main difference between laser light and ordinary light?

Laser light spreads all over the space, while ordinary light is highly directional
Laser light is incoherent, while ordinary light is coherent
Laser light is highly directional, while ordinary light spreads all over the space (correct)
Laser light is made up of large number of wavelengths, while ordinary light is a single wavelength

What does the term 'LASER' stand for?

Light Amplification by Spontaneous Emission of Radiation
Luminous Amplification by Stimulated Emission of Radiation
Luminous Amplification by Spontaneous Emission of Radiation
Light Amplification by Stimulated Emission of Radiation (correct)

What is a characteristic property of laser light?

It is a single wavelength, i.e. it is a monochromatic source of light (correct)
It spreads all over the space
It is made up of large number of wavelengths
All its wavelengths are out of phase

What is the structure and classification of optical fibers based on?

Material, refractive index and number of modes (C) Signup and view all the answers

In which application is laser used?

Eye Surgery (B) Signup and view all the answers

Explain the concept of population inversion and its significance in laser operation.

Population inversion is the situation where more atoms or molecules exist in higher energy states than in lower energy states. In the context of laser operation, population inversion is necessary to achieve stimulated emission and amplify the light signal. It allows the laser to produce a concentrated beam of coherent light. Signup and view all the answers

Describe the structure and classification of optical fibers based on material, refractive index, and number of modes.

Optical fibers can be classified based on the material used (e.g., glass or plastic), refractive index profile (e.g., step-index or graded-index), and the number of modes supported (e.g., single-mode or multi-mode fibers). The structure typically consists of a core, cladding, and protective coating. Signup and view all the answers

Explain the concept of numerical aperture and its role in optical fiber propagation.

Numerical aperture (NA) is a measure of the light-gathering ability of an optical fiber. It determines the range of acceptance angles for incoming light and influences the fiber's ability to capture and transmit light signals effectively. A higher NA generally corresponds to better light-capturing capability. Signup and view all the answers

Discuss the applications of laser technology in industry and everyday life, providing specific examples.

Laser technology finds diverse applications, including barcode reading, laser printing, optical communication, eye surgery, dental drilling, industrial cutting, welding, drilling, and diamond industry processes. For instance, lasers are used in precision cutting of materials and in medical procedures such as LASIK eye surgery. Signup and view all the answers

Differentiate between the characteristics of laser light and ordinary light, highlighting their fundamental distinctions.

Laser light is highly directional and does not spread, unlike ordinary light. It is monochromatic, consisting of a single wavelength, and exhibits high coherence, with all wavelengths in phase. In contrast, ordinary light spreads in all directions, comprises multiple wavelengths, and lacks the coherence of laser light. Signup and view all the answers

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