Abstract
We look at the source equation for the electric vector of radiation inside a maser cavity (W. E. Lamb jr.) and investigate if a volume density of polarizationP = ( 2—Φ/c2)E, induced by gravitation (potential Φ) in space with an electric vectorE, can stimulate maser oscillations (vacuum of course is our acting medium). We consider the case of single-mode excitation. We see that, ifΦ does not vary with time, we get frequency shift only. Wave amplification would necessarily require a time-dependent Φ. Assuming a periodicityTn = 2π/vn inΦ, wherevn is the angular frequency of the excited mode of radiation in the cavity resonator, we see that the 2vn Fourier component inΦ is responsible for maser amplification. For the shift of frequency we observe that it is of the same order as the gravitational red-shift. Examples are constructed with some optical resonators.
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