Скачать или смотреть Laser light || unit 4 | Engineering Physics By Niraj Sir

Laser light || unit 4 | Engineering Physics By Niraj Sir



YouTube Description: Laser Technology – Introduction, Absorption, Spontaneous, and Stimulated Emission

Exploring the Science Behind Laser Technology

Welcome to this comprehensive guide on laser technology, where we dive into its fundamental principles, including absorption, spontaneous emission, and stimulated emission. Lasers are pivotal in modern science and technology, playing a key role in medicine, communication, industry, and more. This video breaks down the basics of how lasers work and the essential processes behind their operation.


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🔍 What You’ll Learn in This Video:

1. Introduction to Lasers:

What is a laser, and how does it work?

The meaning of LASER (Light Amplification by Stimulated Emission of Radiation).



2. Principles of Laser Technology:

Absorption of radiation.

Spontaneous emission of photons.

Stimulated emission – the foundation of laser technology.



3. How Lasers Operate:

Interaction between light and matter.

Population inversion and the role of optical cavities.



4. Applications of Lasers:

Everyday uses and advanced industrial applications.



5. Future Trends in Laser Technology:

Cutting-edge innovations in laser science.





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🌟 Introduction to Lasers

Laser stands for Light Amplification by Stimulated Emission of Radiation. Unlike ordinary light sources, lasers produce beams of light that are highly focused, coherent, and monochromatic.

Key Features of Lasers:

Monochromatic: Lasers emit light at a single wavelength.

Coherent: The light waves are synchronized in phase.

Directional: Lasers produce a narrow and focused beam.



These properties make lasers unique and suitable for a wide range of applications, from delicate surgeries to cutting through metals.


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💡 Absorption, Spontaneous Emission, and Stimulated Emission

1. Absorption of Radiation:

What Is Absorption?
Absorption occurs when an atom or molecule absorbs energy from an incoming photon, causing an electron to move to a higher energy level.

Conditions for Absorption:

The energy of the photon must match the energy gap between the lower and higher energy states of the atom or molecule.


Role in Lasers:
Absorption is the first step in the laser process, exciting electrons to higher energy states, which is essential for achieving population inversion.


2. Spontaneous Emission:

What Is Spontaneous Emission?
After absorption, an electron in an excited state naturally returns to its lower energy level, releasing a photon in the process. This emission happens randomly in terms of direction and phase.

Key Characteristics of Spontaneous Emission:

Emitted photons are incoherent.

The process is random and not directional.


Significance in Lasers:
Spontaneous emission is the foundation for stimulated emission, which amplifies light in lasers.


3. Stimulated Emission:

What Is Stimulated Emission?
Stimulated emission occurs when an incoming photon of the right energy interacts with an excited electron, causing it to release a second photon. The emitted photon has the same energy, phase, and direction as the incoming photon.

Why Stimulated Emission Is Key:

It produces coherent light, which is essential for laser operation.

This process is what amplifies light, creating the intense beams characteristic of lasers.




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🚀 Join the Conversation

Have questions about lasers? Want to share your thoughts on their applications? Let us know in the comments below!

Don’t forget to like, subscribe, and share this video to help others learn about the science of lasers.


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