| 1 | The basic characteristic of 120 ℃ thermoluminescence peak of iceland spar was studied. | |
| 2 | The sample was made of FK-2 glass and iceland crystal, between which either glycerine or organic silica gel could be used for gluing. | |
| 3 | The main refractive indices of calcite crystal are measured by the means of auto-collimation, and the thermo-optical coefficients are calculated. | |
| 4 | In order to modify the deviation angle of ultraviolet polarizing prism of iceland crystal and barium fluoride, a new design was given by changing the structure angle of the iceland crystal. |
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