It is of great theoretical importance to know whether the momentum and the energy flow of photons can be non collinear. Christian Imbert has located an example in the case of total reflection : in circular polarized light the plane of reflection no longer coincides with the plane of incidence: in addition to the well known Goos Hanchen effect (longitudinal shift) a lateral shift of the plane of reflection can be predicted and has been shown experimentally the flow of energy produced by evanescent waves in the less reflective medium has a component perpendicular to the incidence plane; the sign of this component depends upon sign of rotation of the polarized light.
Some arrangements of in-line holographic interferometry are described. In the first case no diffuser is used and then a diffuser is used as a beam splitter. In the set up without the diffuser, the observation is made in white light as the hologram itself. The advantages and disadvantages of the different arrangements are indicated.
Recent developments in the controlled nuclear fusion research are summarized. After giving some insights into the feature of the D-T steady state reactor, plasma confinement ploblems are discussed in three magnetic field geometries. In low beta torus, the most remarkable progress is shown in axismmetric toruses. In an inner conductor torus, stable plasmas are confined for the time of ideal magnetic confinement, that is, classical diffusion time and in a tokamak, the highest temperature and density are achieved as a torus. Stable confinements are also obtained in high beta plasmas of linear theta pinch geometries. In order to prevent end losses, theta pinch experiments in toroidal geometries are now under way. The same order of densities and temperatures as low beta torus are achieved in mirror devices and after suppression of micro-instabilities the remaining problem is to overcome the collisional end losses.
The electrical resistance of Ag films evapo-rated at room temperature is measured as a function of time t. The resistance decreases rapidly after the deposition and several hours later it approaches a constant value. His constant value is the value of the resistance as tt approaches infinity. If the decay of the resistance can be considered to correspond to the chemical reaction, the order of reaction becomes about 3 for small t and about 2 for large t.
The light of a He-Ne laser with Brewster windows is weakly elliptically polarized and the ellipticity varies with the rotation of resonator mirrors about the resonator axis. It is concluded that the main origin of the ellipticity is due to the anisotropy of resonator mirrors.