LEC #07 II AKTU I Threshold GAIN IN LASER II LASERS system and applications II SEM 3/4

Welcome to our in-depth discussion on the fundamentals of lasers, focusing on spatial coherence and temporal coherence! 🌟
Fiber optics, holography, and lasers are fundamental topics in Engineering Physics for 1st-year students, offering exciting insights into modern technological applications. In this lecture series on Laser Systems and Applications, we will explore the fascinating interplay between light and matter. From the principles of optics, such as Young's Double-Slit Experiment and its derivation, to the intricate design of laser systems, this series unravels the science driving cutting-edge advancements. You'll also learn about the role of fiber optics in high-speed communication and the transformative impact of holography in imaging and data storage. This Engineering Physics series provides a comprehensive understanding of these technologies, tailored for first-year students, making it an ideal resource to excel academically and connect theory with real-world applications.
Subscribe to our UA-cam channel for engaging content and boost your knowledge in lasers, fiber optics, and optics as part of your journey in Engineering Physics!
In this video, we break down these crucial concepts that define the unique properties of laser light:
Spatial Coherence: Learn how lasers produce a narrow, well-defined beam that stays focused over long distances.
Temporal Coherence: Understand how the consistent phase relationship over time leads to monochromatic light.
With clear examples and simple explanations, we’ll help you grasp why lasers are indispensable in technologies like fiber optics, holography, and medical imaging.
#Fundamentals of lasers #Spatial coherence #Temporal coherence #Laser #light properties #Monochromatic light #Laser applications #Physics of lasers #Laser beam focus #Coherence in lasers
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content on laser physics and optics! 😊
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0:01 general talk on the idea of learning
2:25 starting of physics discussion
3:31 pre idea for the derivation of the Einstein coefficient (very important)
5:57 meaning of the energy levels
9:14 the Planck's law in basic form
11:16 motivation for the derivation of A and B coefficients
13:40 derivation started
19:34 meaning of the equilibrium conditioning this atomic scenario
21:16 how Einstein got the idea of the stimulated emission
31:01 rewrite the rate equation for the final derivation
34:45 final expression of the derivation
36:00 what is the meaning of the being genius
37:38 final expression
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