By Friedrich Bachmann, Peter Loosen, Reinhart Poprawe
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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.