Journal of Physical Studies 3(4), 451–455 (1999) DOI: https://doi.org/10.30970/jps.03.451 INFLUENCE OF BENNET GAPS ON SINGLE FREQUENCY GENERATION

G. Kononchuk
Kyiv Shevchenko University
6 Hlushkova Pr., Kyiv, UA-03127, Ukraine

Based on the classic dispertion theory, the equation was obtained that links the features of cavity, medium and deviation. We described Bennet gap by the Lorentz function, and the amplification line by Voigt's function.

The refraction index $n(ω$) in the region of irregular dispersion appeared to be a function of the cavity loss index $β_0$, the maximum amplification coefficient $K_0^V$, the ratio of homogeneous and heterogeneous line spreading, the spectral mode position $ω_q$. Adjacent modes beat frequency (AMBF) in He–Ne–laser ($λ = 0,63 μ m$) with quasiisotropic cavity was experimentally obtained. This He–Ne–laser generates two non–interacting modes where each mode satisfies the reqiurement for single mode generation. A comparison of the calculated and experimentally obtained shift of AMBF allows to determine $K_0^V$, $β_0$, $γ$ directly for the working laser. It is shown that the accuracy of stabilization of generation frequency as a result of the AMBF control should not exceed $10^{-10}$. Testing of AMBF in quasi–isotopic cavity allows to observe the mirror anisotropy of $2 π\cdot 10^{-5}$ radian.

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