Video Title: He Ne Laser Construction | Akash K Tutorials
Channel: Akash K Tutorials
Speakers: Not specified
Duration: 00:07:22
Overview
This video explains the construction, working, advantages, disadvantages, and applications of a Helium-Neon (HeNe) laser. It covers the basic definition of a HeNe laser, its components, and its use in various fields.
Key takeaways
Definition and Characteristics: A Helium-Neon laser, also known as an HN laser, is a type of gas laser that produces red light with a wavelength of 632.8 nm.
Construction: It consists of a glass tube filled with a mixture of 90% Helium and 10% Neon, acting as the gain medium. It also includes a fully reflected mirror at one end and a partially reflected mirror (output coupler) at the other, forming an optical resonator. Electrical pumping is used, with an anode and cathode connected to a DC power supply to ionize the gas.
Working Principle: When electrical current is supplied, the gas mixture is excited, leading to the production of laser light. The photons oscillate between the two mirrors, with some light escaping through the output coupler.
Advantages: HeNe lasers are reliable with a long operational life, produce coherent light, and have a narrow line width, making them suitable for precise measurements.
Disadvantages: They have low gain compared to other lasers, a limited wavelength range, can be more expensive than semiconductor lasers, and require high voltage for operation.
Applications: HeNe lasers are used in holography, telecommunications, scientific research, light shows, entertainment, precise measurements, treating eye conditions like retinal detachment, and in dermatology for conditions like acne, scars, and wrinkles.
