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Wavelength of Helium-Neon Laser by Using Double Slit Interference Pattern - YouTube
PhysicsLAB: Using Young's Equation - Wavelength of a Helium-Neon Laser
A helium-neon laser is pumped by electric discharge. What wavelength electromagnetic radiation would be needed to pump it? See Figure 30.39 for energy-level information. | bartleby
Helium Neon (He-Ne) Lasers
Helium–neon laser - Wikipedia
The Michelson Interferometer as a Device for Measuring the Wavelength of a Helium-Neon Laser | Semantic Scholar