FIELD: optics.
SUBSTANCE: method includes proton-exchange reaction through mask of special topology in melt of acid, performed in hermetic autoclave at low-frequency vibration and at temperature 290-373°C during 3-16 hours in melt of pure stearin acid with admixture of lithium stearate in range of concentrations of 0.4-1.0 percents of mass, while low-frequency vibration is performed at frequency from 5 to 8 Hz.
EFFECT: lower laboriousness.
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