<p> Following the introduction to the field of lasers and the theories of laser oscillations in the light output, it is pointed out that calculations involving existing theories yield oscillation periods in excess of the period observed for our crystal. To account for this disagreement, the thesis proposes the inclusion of the additional loss terms of scatter and diffraction augmenting the transmission loss. The theory of Birnbaum Stocker and Welles (BSWl) is extended to include these additional loss mechan- isms and the oscillation period predicted, using the mea- sured values of these parameters is in good agreement with the. observed oscillation period. </p> / Thesis / Master of Science (MSc)

This diploma thesis is concerned with selecting the appropriate method for determining the moment of inertia to the vertical, lateral and longitudinal axis through the centre of gravity of the vehicle. Using the special mechanical device, constructed on IAE was carried out repeated measurements of known mass properties in each axis. With the aid of obtained data was calculated measurement error. To compare the resulting values was created MBS model.

This master's thesis deals with problems connected with measuring vehicle centre of gravity height. The research part summarizes generally known methods of measuring vehicle centre of gravity and moments of inertia. Essential part of this thesis is the design of a device for measuring the centre of gravity height of a road vehicle on a principle of measuring a period of oscillation. The height position of the platform of the device is adjustable through hydraulic cylinders. A stress-strain analysis of the design was executed through a combination of analytical methods and a finite element method. The process of measurement was described and an equation for determination of centre of gravity height was deduced. Error of measurement was estimated based on the knowledge of partial errors of measured values.