Nd-YAG Laser in Tamil PH3151 Engineering Physics Unit 3 Oscillations, Optics and Lasers

4G Silver Academy தமிழ்

15 Apr 202316:15

Summary

TLDRWelcome to 4G Silver Academy's laser physics lesson. The video explains the functioning of a Neodymium-doped (Nd:YAG) laser, focusing on its energy levels and the process of optical pumping by a Krypton flash tube. It details how neodymium ions transition between energy levels, emitting a laser beam at 1.064 micrometers. The video also covers the construction, working principles, energy level diagrams, characteristics, advantages, disadvantages, and applications of the Nd:YAG laser, providing a comprehensive overview of this high-energy laser technology.

Takeaways

🌟 The video is an educational introduction to the 4G Silver Academy's laser principle.
🔬 The active medium in the laser is a neodymium-doped (ND) rod, optically pumped by a krypton flash lamp.
💡 The krypton flash tube emits a beam with a wavelength of 1.064 micrometers when excited.
📈 The energy level transitions of neodymium ions are crucial for laser operation, particularly from E3 and E4 to E2.
🚀 The spontaneous transition of Nd3+ ions from E2 to E1 results in the emission of high-energy photons.
🔄 The process of population inversion is essential for achieving the intense laser light output.
🔋 The laser has a high energy output and is easier to achieve population inversion compared to other systems.
📊 The energy level structure of Nd3+ in Nd:YAG is complex, which is detailed in the video.
🏗️ The video covers the construction of the Nd:YAG laser, including the components and their arrangement.
🔍 The working principle of the laser is explained, focusing on the energy transitions and light emission.
🌐 The video discusses the advantages of the Nd:YAG laser, such as high output and ease of population inversion.
🔧 The disadvantages and applications of the Nd:YAG laser are also mentioned, though specifics are not detailed in the transcript.

Q & A

What is the main topic of the video?
-The main topic of the video is the explanation of how a Nd:YAG laser works, including its principle, construction, and applications.
What does Nd:YAG stand for?
-Nd:YAG stands for Neodymium-doped Yttrium Aluminum Garnet, which is the active medium used in the laser.
What is the role of the Krypton flash tube in the Nd:YAG laser?
-The Krypton flash tube is used to optically pump the Nd:YAG rod, providing the energy needed to excite the neodymium ions.
What is the wavelength of the laser beam emitted by the Nd:YAG laser?
-The Nd:YAG laser emits a laser beam with a wavelength of 1.064 micrometers.
What is the purpose of the Nd3+ ions in the laser medium?
-The Nd3+ ions serve as the active ions in the Nd:YAG laser medium, responsible for the laser's emission when they transition between energy levels.
What is the process that leads to the emission of the laser beam?
-The process involves the excitation of Nd3+ ions from the ground state to higher energy levels by the Krypton flash tube, followed by a transition to a lower energy level, emitting a photon in the process.
What is population inversion and how is it achieved in the Nd:YAG laser?
-Population inversion is a state where more atoms are in an excited state than in the ground state. In the Nd:YAG laser, it is achieved through optical pumping by the Krypton flash tube.
What are the advantages of using a Nd:YAG laser?
-The Nd:YAG laser has high energy output and is easier to achieve population inversion. It also has a complex electron energy level structure, which contributes to its efficiency.
What are the typical applications of the Nd:YAG laser?
-The Nd:YAG laser has various applications including material processing, medical treatments, and military uses.
What is the significance of the energy level diagram in understanding the Nd:YAG laser?
-The energy level diagram helps in visualizing the transitions between different energy levels of Nd3+ ions, which is crucial for understanding the laser's operation.
How does the spontaneous emission of photons contribute to the laser's operation?
-Spontaneous emission of photons from the Nd3+ ions is the initial step in the laser's operation, which eventually leads to stimulated emission and the generation of the laser beam.