The present invention relates to a solid pharmaceutical dosage form comprising ticagrelor as pharmaceutically active ingredient, to certain particles of ticagrelor and to processes of preparing the same. In particular, in the laser light irradiation, there can be formed patterns independent of the length of the very small concavities and convexities by irradiation of laser light modulated by a frequency higher than a period of very small concavities and convexities. The ultraviolet light bulb preferably includes a casing for holding a starting gas and a vaporizable material, and at least one electrode electrically coupled to the power source for exciting the starting gas and the vaporizable material within the casing. In this state, alternating magnetic field is applied through a magnetic head to the magneto-optical disk, thereby concurrently causing transfer and expansion of a magnetic domain to the reproducing layer.