Abstract
The collimating properties of differently shaped cylindrical lenses for diode laser arrays are measured using densitometric evaluations of irradiated infrared films. 30 mm lengths of round and truncated quartz fibres are used as cylindrical lenses. The full width half maximum (FWHM) divergence of the diode laser beam perpendicular to the axis of the linear diode array can be reduced from 40 degrees to less than 1 degrees for all investigated types of fibre lenses. Also the coupling efficiency and the alignment tolerances for different fibre lenses have been investigated. For a divergence of 5 degrees FWHM after the optical element a coupling efficiency of 82% is obtained for a round cylindrical fibre lens. Fibre lenses are found to be the most efficient and economic mode matching element for diode end-pumped lasers or diode-to-fibre coupling. Calculations based on geometrical optics are in good agreement with the measurements.
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Schedule a callMore From: Pure and Applied Optics: Journal of the European Optical Society Part A
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