Micro-optical components for fiber coupling of high-power laser diode bars

Torsten Possner; Bernhard Messerschmidt; Anke Kraeplin; Bernd Hoefer; Peter Schreiber

doi:10.1117/12.363755

17 September 1999 Micro-optical components for fiber coupling of high-power laser diode bars

Torsten Possner, Bernhard Messerschmidt, Anke Kraeplin, Bernd Hoefer, Peter Schreiber

Proceedings Volume 3778, Gradient Index, Miniature, and Diffractive Optical Systems; (1999) https://doi.org/10.1117/12.363755
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

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 (P_out 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.

Citation Download Citation

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); https://doi.org/10.1117/12.363755

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