B. Sumpf , R. Hülsewede, G. Erbert, C. Dzionk, J. Fricke, A. Knauer, W. Pittroff, P. Ressel, J. Sebastian und G. Tränkle

Published in:

Optical and Quantum Electronics, vol. 25, 521-532 (2003).

Abstract:

High brightness tapered laser diodes with different resonator geometries were fabricated and analysed. The devices consist of an index-guided straight section and a gain-guided tapered section. Lasers with a total length L = 2 and 4 mm and different length of the ridge wave guide L_RW (500 µm ≤ L_RW ≤ 1250 µm) for L = 2 mm and 500 µm ≤ L_RW ≤ 2000  µm for L=4 mm) were processed to study the influence of the straight section on the spatial mode filtering. The power-voltage-current-characteristics, the beam waist, the farfield, and the beam propagation factor M² were measured. From the experiments, it can be stated that the lasers with a small L_RW reach higher output powers compared to those with larger L_RW. Concerning the beam quality the length L_RW should exceed a minimal value to guarantee efficient spatial mode filtering. Devices optimised concerning maximum output power and excellent beam quality reach a beam propagation factor smaller than 2.1 at an output power P = 2 W.

Index Terms:
high brightness lasers, high power diode lasers, tapered lasers, visible lasers.

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