High power diode lasers : technology and applications by Friedrich Bachmann, Peter Loosen, Reinhart Poprawe

By Friedrich Bachmann, Peter Loosen, Reinhart Poprawe

This publication summarizes a 5 yr learn undertaking, in addition to next effects concerning excessive strength diode laser platforms and their software in fabrics processing. The textual content explores the complete chain of expertise, from the semiconductor expertise, via cooling mounting and meeting, beam shaping and method expertise, to functions within the processing of such fabrics as metals and polymers. contains theoretical versions, a variety of very important parameters and sensible tips.

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31) For all other detector positions on a circle with radius d the angle α is smaller. 5◦ . By rotating the laser bar around fast and slow axes, a two-dimensional scan of the far-field intensity distribution IFF (ϕ, θ ) can be generated. 22. (a) Schematic set-up for the far-field measurement of a laser bar. 23. Fast-axis and slow-axis far-field intensity distributions of a standard broad area laser bar measure only one-dimensional profiles along fast and slow axes (Fig. 23). From these profiles, the fast- and slow-axis divergence angles can be calculated.

A less complicated design often results in lower rework rates; a well-established technology results in a higher uptime of machinery, and a smaller chip is more tolerant of manufacturing and handling errors than bigger laser bars. Also the degree of automation plays a crucial role in manufacturing costs. Normally, a higher degree of automation results in higher yield due to reduced mishandling, leading to lower production costs per unit on one side; but it results in higher costs of ownership on the other side.

48 Martin Behringer The successful operation and required stability against the induced stress requires consideration of a number of design aspects. As a rule of thumb, it is necessary to apply a current of ≈1 A to obtain an optical output of 1 W (at a wavelength of ≈1 μm). For laser bars emitting 50 W this results in a total electric load of ≈50 A. Therefore, large contact areas and a large pn-junction area for the optical emission must be applied to minimize the local current densities. • The increase of wall plug efficiency represents the best way to reduce the heat load.

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