Wavelength-locking by a volume holographic grating (VHG) is reported for a diode laser bar with 49 single mode emitters, fitted with a dual-axis collimation phase-plate for smile elimination and excellent beam pointing correction. The much-improved VHG feedback with the ultra-collimated array beam gives 100% wavelength locking at 975 nm over a 17°C temperature range and external cavity lengths up to 110 mm. This enables a folded cavity configuration to provide a fully-locked array with wavelength selection into 200 pm channels over an 8 nm band, suitable for multi-bar dense wavelength-combining.

© 2013 OSA

1. T. Y. Fan, “Laser beam combining for high-power, high-radiance sources,” IEEE J. Sel. Top. Quantum Electron.11(3), 567–577 (2005). [CrossRef]
2. N. Trela, H. J. Baker, J. J. Wendland, and D. R. Hall, “Dual-axis beam correction for an array of single-mode diode laser emitters using a laser-written custom phase-plate,” Opt. Express17(26), 23576–23581 (2009). [CrossRef] [PubMed]
3. J. F. Monjardin, K. M. Nowak, H. J. Baker, and D. R. Hall, “Correction of beam errors in high power laser diode bars and stacks,” Opt. Express14(18), 8178–8183 (2006). [CrossRef] [PubMed]
4. C. Moser, L. Ho, and F. Havermeyer, “Self-aligned non-dispersive external cavity tunable laser,” Opt. Express16(21), 16691–16696 (2008). [CrossRef] [PubMed]
5. H. T. Hsieh, W. Liu, F. Havermeyer, C. Moser, and D. Psaltis, “Beam-width-dependent filtering properties of strong volume holographic gratings,” Appl. Opt.45(16), 3774–3780 (2006). [CrossRef] [PubMed]

Appl. Opt.

• H. T. Hsieh, W. Liu, F. Havermeyer, C. Moser, and D. Psaltis, “Beam-width-dependent filtering properties of strong volume holographic gratings,” Appl. Opt.45(16), 3774–3780 (2006). [CrossRef] [PubMed]

IEEE J. Sel. Top. Quantum Electron.

• T. Y. Fan, “Laser beam combining for high-power, high-radiance sources,” IEEE J. Sel. Top. Quantum Electron.11(3), 567–577 (2005). [CrossRef]

Opt. Express

• N. Trela, H. J. Baker, J. J. Wendland, and D. R. Hall, “Dual-axis beam correction for an array of single-mode diode laser emitters using a laser-written custom phase-plate,” Opt. Express17(26), 23576–23581 (2009). [CrossRef] [PubMed]
• J. F. Monjardin, K. M. Nowak, H. J. Baker, and D. R. Hall, “Correction of beam errors in high power laser diode bars and stacks,” Opt. Express14(18), 8178–8183 (2006). [CrossRef] [PubMed]
• C. Moser, L. Ho, and F. Havermeyer, “Self-aligned non-dispersive external cavity tunable laser,” Opt. Express16(21), 16691–16696 (2008). [CrossRef] [PubMed]

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