Lecture
This lecture covers the principles of lasers, including lasing transitions, the particle character of light, and various laser applications such as optical tweezers, microscopy, manipulation, and spectroscopy. Specific examples like the Helium Neon Laser and different types of molecular gas lasers are discussed. The lecture also delves into topics like X-ray sources, diffraction, imaging, and spectroscopy. The instructor emphasizes the importance of understanding laser principles for various fields like research, manufacturing, medical applications, navigation, and communications.