Abstract

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

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References

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  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. Express 17(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. Express 14(18), 8178–8183 (2006).
    [Crossref] [PubMed]
  4. C. Moser, L. Ho, and F. Havermeyer, “Self-aligned non-dispersive external cavity tunable laser,” Opt. Express 16(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]

2009 (1)

2008 (1)

2006 (2)

2005 (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]

Baker, H. J.

Fan, T. Y.

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

Hall, D. R.

Havermeyer, F.

Ho, L.

Hsieh, H. T.

Liu, W.

Monjardin, J. F.

Moser, C.

Nowak, K. M.

Psaltis, D.

Trela, N.

Wendland, J. J.

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Figures (5)

Fig. 1
Fig. 1

Schematic diagrams of the external cavity configuration and corresponding beam profiles before and after a round trip, for fast-axis in (a) and (b) and slow-axis in (c) and (d).

Fig. 2
Fig. 2

Imaging spectrometer view of bar emission when (a) fully-locked (b) partly-locked and (c) unlocked. (d) High resolution spectrum for a sampled single emitter

Fig. 3
Fig. 3

Efficiency of VHG locking with DE = 15% (a) as a function of temperature of the heat sink with VHG placed at 3 mm distance from the laser and (b) distance between the VHG and laser facet for 0.6 nm VHG offset.

Fig. 4
Fig. 4

Experimental setup for wavelength selection in a folded cavity with a VHG.

Fig. 5
Fig. 5

Wavelength vs. angle of the VHG obtained in the folded cavity configuration and examples of measured spectra. The laser was operated at 20A of drive current. (Note: the non-uniform intensity pattern and a slight tilt of the image are due to aberrations in the imaging system.)

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