A particular HeNe laser operating at 632.8 nm has a tube that is 40 cm long....

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Physics

A particular HeNe laser operating at 632.8 nm has a tube that is40 cm long. The operating gas temperature is about 130 ï‚°C.

Calculate the frequency separation and the wavelengthseparation of the laser modes. How do these change as thetube warms up during operation? Taking the linear expansioncoefficient to be 10-6 K-1, estimate the change in the modefrequency separation.

(please calculate the frequency separation and the wavelengthseparation)

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