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Calculate the number of possible longitudinal modes in a He-Ne laser having a cavity of length of one meter.What is the separation between two modes?

April 26, 2017CALCULATE cavity laser LENGTH longitudinal modes possible

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Calculate the number of possible longitudinal modes in a He-Ne laser having a cavity of length of one meter.What is the separation between two modes?

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The number of possible modes can be estimated using the following equation: 2nL=Nλ where L is the length of the cavity, N is number of all possible modes, n is the refractive index of the lasing medium and λ is the wavelength.