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Proceedings Paper

High-brightness fiber-coupled single emitter arrays
Author(s): Stefan Heinemann; Boris Regaard; Torsten Schmidt; Ben Lewis
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Paper Abstract

Commercial high power fiber coupled diode lasers reach power levels of 200W from a 0.2mm fiber, NA=0.2. 2D fiber coupled single emitter (SE) arrays are described delivering 500W from a 0.2mm fiber. The beam quality of standard 90μm single emitter (SE) is 6mm*mrad (slow axis) and 0.7mm*mrad (fast axis) including errors from fast axis lensing. 3 SEs (24) can be arranged in slow axis (fast axis) to fill the aperture for coupling into a 0.2mm fiber, NA=0.2. For high efficiency, beam shaping optics are avoided. A lens array for slow axis collimation and a focusing optic complete the fiber coupled module. 44 SEs' are arranged as a 2D array, polarization multiplexed and coupled into a 0.2mm fiber, NA=0.2. 62% optical to optical and 75% coupling efficiency are achieved, close to the modeled coupling efficiency of 80%. Alignment tolerances in the system do account for additional losses. Precise manufacturing processes are essential. The SEs on submounts are soldered in one reflow process to a common heatsink and FAC-lensing station automatically aligns the lens based on image processing ensuring minimum total lensing errors (focusing and pointing) of each SE to <15% of total spot size. Tighter tolerances during SE mounting, improved fast axis collimation and a redesigned coupling optic will increase the coupling efficiency to 80% resulting in 410W linear polarized output from the 0.2mm fiber, NA=0.2. Polarization (800W) and dense wavelength multiplexing (1.4kW) open the door to kilowatt level.

Paper Details

Date Published: 23 February 2009
PDF: 5 pages
Proc. SPIE 7198, High-Power Diode Laser Technology and Applications VII, 71980Q (23 February 2009); doi: 10.1117/12.805620
Show Author Affiliations
Stefan Heinemann, Fraunhofer USA Inc. (United States)
Boris Regaard, Fraunhofer USA Inc. (United States)
Torsten Schmidt, Fraunhofer USA Inc. (United States)
Ben Lewis, Fraunhofer USA Inc. (United States)

Published in SPIE Proceedings Vol. 7198:
High-Power Diode Laser Technology and Applications VII
Mark S. Zediker, Editor(s)

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