Helium-Neon Laser

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the Helium-Neon Laser is largely due to doppler broadening. Another key feature of the Helium Neon laser is that it is a resonant cavity wherein you can have perhaps a 1,000,000 half-wavelengths ( 1) t inside it. If 1,000,001 half-wavelengths t inside the same cavity this would obviously correspond to a slightly shorter wavelength (

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