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17 September 1999 Micro-optical components for fiber coupling of high-power laser diode bars
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A microoptical beam transformation system for coupling a high power laser diode bars into multimode optical fibers is introduced. The key components are a gradient-index cylindrical lens for the collimation of the fast-axis radiation and an array of blazed gratings for beam deflection of the single emitter bundles in the slow-axis. Excellent optical performance and high numerical aperture is required for the cylindrical lens. The lenses are fabricated by Ag+/Na+ ion exchange and exhibit diffraction-limited performance up to N.A. equals 0.5. The array of blazed gratings is produced by e-beam lithography in a variable dose writing mode. The diffraction efficiency into the desired order is higher than 85% for each element. Using these elements coupling of more than 60% of the output power of a 19 emitter high power laser diode bar (Pout equals 20 W) into a 200 micrometers fiber of N.A. equals 0.2 is achieved. Applications in fiber laser pumping, solid state laser pumping as well as laser soldering and plastic welding are discussed.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Torsten Possner, Bernhard Messerschmidt, Anke Kraeplin, Bernd Hoefer, and Peter Schreiber "Micro-optical components for fiber coupling of high-power laser diode bars", Proc. SPIE 3778, Gradient Index, Miniature, and Diffractive Optical Systems, (17 September 1999);


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