The goal of the diploma thesis is the design, construction and testing of semi-automatic device for measuring numerical aperture of laser fibre. The main reason for elaboration of this project was to verify the shape of output laser beam and the refractive index on the final fibre after drawing process from root preform since there was likelihood that diffusion of rare earths would occur during drawing process.
The diploma thesis includes five chapters. The first chapter describes the theory and difference between standard and laser optical fibres, their parameters from numerical aperture to beam quality M2. The second chapter present the conceptual design of our system and its implementation in practice, presentation of used components, review of other devices with which we can measure the numerical aperture, the method of measurement and method of calculation results and review of the standard IEC 60793-1-43. In the third chapter we performed measurements with the new system on fibres lasers, analysis of the obtained results and comparison with measurements on other devices (Photon Kinetics PK2600, York S14, IFA100). In the fourth chapter is developed and presented a program for moving motorized linear positioner (stepper motor) in LabView environment and possibility of complete automation of measurement. The last chapter contains conclusions.
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