Abstract:
Issues related to the efficiency of light modulation in order to select the optimal modulator for high-precision light rangefinders are considered. It is proved by calculation that the modulation efficiency is affected by the size of electro-optical crystals. It is shown that depending on the resonant frequency for each light modulator, there is an optimal length of the $l_{opt}$, crystal, which is determined from the condition of the maximum coefficient $K$, which occurs when $l_{opt}=\lambda_\mu/5,5n_0$. The effect of the $K$ coefficient, which takes into account the time of light passing through the crystal, is particularly important at high frequencies on the transverse electro-optical effect.
Keywords:electro-optical KDP and LiNbO$_3$ crystals, light modem, phase shift, longitudinal and transverse electro-optical effects, modulation power, optimal crystal length.
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