26 February 2013 Monolithic fast-axis collimation of diode laser stacks
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Abstract
Commercially-available QCW diode laser stacks with bar pitch below 0.5mm can now deliver source power densities exceeding 10kW/cm2. An increasing number of applications for these sources also specify high brightness, with collimation requirements ranging from equalization of fast and slow axis divergence to achieving fast-axis divergence within a small multiple of the diffraction limit. While collimation can be achieved by mounting an array of rod lenses in a frame with a suitable v-groove array, the resulting optical assembly has a large number of elements and associated adhesive bonds, and the size of the mounting frame limits the density at which stacks can be packed together. We present results exploiting an alternative approach using monolithic fast-axis collimator arrays. This approach greatly reduces the component count and minimizes the number of adhesive bonds required, providing a compact and rugged assembly well-suited to demanding applications. The monolithic collimator array also simplifies package design, and maximizes the achievable device stack packing density. Lens array properties may be tailored to generate applicationspecific divergence profiles or to match the geometry of individual stacks in order to achieve low divergence. Directwrite fabrication of these components allows mass-customization, offering a scalable, low-cost route to high volume collimation for fusion applications.
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Roy McBride, Roy McBride, Natalia Trela, Natalia Trela, Matthew O. Currie, Matthew O. Currie, Jozef J. Wendland, Jozef J. Wendland, Howard J. Baker, Howard J. Baker, } "Monolithic fast-axis collimation of diode laser stacks", Proc. SPIE 8605, High-Power Diode Laser Technology and Applications XI, 860507 (26 February 2013); doi: 10.1117/12.2005232; https://doi.org/10.1117/12.2005232
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