The sample was Co (0001), which has an easy direction of magnetization along the  crystal axis
at room temperature, namely, the direction perpendicular to the observed sample plane.
Whenever the plane of polarization of one wave part incorporates a main crystal axis
, in case of cubic crystals the plane of polarization of the other wave part will include another main crystal axis
This will force a pre-orientation of the liquid crystal axis
director [??] along the direction of propagation [??].
Table 1 lists the three suitable classes that are free of natural birefringence and indicates for each class the crystal axis
that must be aligned parallel to the light propagation direction and the direction of the electrooptic axes.
--the crystal is sectioned lengthwise and the composition and concentration in well-defined points, located at equal distances on the crystal axis
, using ICP/MS- LASER Ablation technique are analyzed.
Thus, we arrive at a new concept of the UCN production with SD2, setting a single crystal converter of ortho-deuterium in the exit beam of a cold neutron guide from a pulsed source, and rotate the crystal axis
synchronized to the time-of-flight spectrum of the incident cold neutrons.
Ancient stonecutters could thus cleave it perpendicular to the crystal axis
to produce hexagonal prisms of any desired length.
Examined with a polarizing microscope in visible light of wavelength greater than 450 nm, these crystals show a very weak negative birefringence; i.e., their slow axis (larger refractive index) lies perpendicular to the long crystal axis
Evgraf Stepanovich Fedorov's (1853-1919) universal stage, revolving in all three dimensions, makes the parallel positioning of the optical axis and crystal axis
possible, so that color changes in polarized light and interference figures may be noted.
Figure 3a shows that spinning led to a rotation of this crystal axis
. Without the spin, the b-axis was oriented to the circumferential (transverse) direction; with the spin, b-axis orientation in the machine direction increased.
The Desana imagine a crystal axis
that connects the center of their hexagon to the Earth.