| Abstract: | The variation of the CO2-laser pulse induced breakdown threshold has been studied experimentally in melt-grown NaCl crystals. An increase of the optical strength (up to two order of magnitude) is observed from the „top”︁ towards „bottom”︁ of the large diameter crystal boules, i.e. in the direction in which the impurities are driven away. The dependence of the threshold with the Ca2+ concentration demonstrates a complicated character of the effect of the impurity content on the optical strength of sodium chloride. |
