Abstract

A resonant grating mirror (RGM) that combines a single layer planar waveguide and a subwavelength grating is used to simultaneously control the beam quality, the spectral bandwidth, and the polarization state of an Er:YAG laser. This simple device is compared to classical methods using several intracavity components: an etalon for wavelength selection, a thin film polarizer for polarization selection, and an aperture for spatial filtering. It is demonstrated that the RGM provides the same polarization purity, an enhanced spectral filtering, and a significant improvement of the beam quality. In CW operation, the Er:YAG laser with a RGM emits an output power of 1.4 W at 1617 nm with a M2 of 1.4.

© 2014 Optical Society of America

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References

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2013 (2)

2012 (2)

2005 (1)

S. Li, T. Koscica, Y. Zhang, D. Li, and H.-L. Cui, Proc. SPIE 5995, 59950Y (2005).
[CrossRef]

2001 (1)

1997 (1)

D. Rosenblatt, A. Sharon, and A. A. Friesem, IEEE J. Quantum Electron. 33, 2038 (1997).
[CrossRef]

1993 (1)

1980 (1)

V. A. Sychugov and A. V. Tishchenko, Quantum Electron. 10, 186 (1980).

Ahmed, M. A.

Aubourg, A.

Aubry, N.

Balembois, F.

Bendickson, J. M.

Brundrett, D. L.

Cui, H.-L.

S. Li, T. Koscica, Y. Zhang, D. Li, and H.-L. Cui, Proc. SPIE 5995, 59950Y (2005).
[CrossRef]

Dannecker, B.

Didierjean, J.

Friesem, A. A.

D. Rosenblatt, A. Sharon, and A. A. Friesem, IEEE J. Quantum Electron. 33, 2038 (1997).
[CrossRef]

Gaylord, T. K.

Georges, P.

Glytsis, E. N.

Graf, T.

Haefner, M.

Koscica, T.

S. Li, T. Koscica, Y. Zhang, D. Li, and H.-L. Cui, Proc. SPIE 5995, 59950Y (2005).
[CrossRef]

Li, D.

S. Li, T. Koscica, Y. Zhang, D. Li, and H.-L. Cui, Proc. SPIE 5995, 59950Y (2005).
[CrossRef]

Li, S.

S. Li, T. Koscica, Y. Zhang, D. Li, and H.-L. Cui, Proc. SPIE 5995, 59950Y (2005).
[CrossRef]

Magnusson, R.

Moeller, M.

Moormann, C.

Osten, W.

Pruss, C.

Rosenblatt, D.

D. Rosenblatt, A. Sharon, and A. A. Friesem, IEEE J. Quantum Electron. 33, 2038 (1997).
[CrossRef]

Rumpel, M.

Schoder, T.

Sharon, A.

D. Rosenblatt, A. Sharon, and A. A. Friesem, IEEE J. Quantum Electron. 33, 2038 (1997).
[CrossRef]

Sychugov, V. A.

V. A. Sychugov and A. V. Tishchenko, Quantum Electron. 10, 186 (1980).

Tishchenko, A. V.

V. A. Sychugov and A. V. Tishchenko, Quantum Electron. 10, 186 (1980).

Vogel, M. M.

Voss, A.

Wang, S. S.

Weichelt, B.

Zhang, Y.

S. Li, T. Koscica, Y. Zhang, D. Li, and H.-L. Cui, Proc. SPIE 5995, 59950Y (2005).
[CrossRef]

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Figures (8)

Fig. 1.
Fig. 1.

(a) RGM structure and (b) AFM scan of the surface.

Fig. 2.
Fig. 2.

Calculated reflectivity versus the wavelength for TE and TM polarization at an AOI of 24.43° around 1617 nm.

Fig. 3.
Fig. 3.

Calculated reflectivity and FWHM versus the wavelength at different AOI for TE and TM polarization.

Fig. 4.
Fig. 4.

Characterization setup.

Fig. 5.
Fig. 5.

Measured (red dotted line) and calculated (blue solid line) TE reflectivity versus AOI of the RGM. The fit corresponds to an adjustment of the theoretical reflectivity without scattering-, absorption-, or divergence-related losses.

Fig. 6.
Fig. 6.

(a) Resonator setup with thin film polarizer, an etalon, and an aperture. The beam is collimated between M2 and M3 mirrors. The etalon ensures wavelength selectivity (from 1645 to 1617 nm) and the polarizer ensures linear vertical polarized output. The aperture reduces the power contributions of higher order Gaussian modes. (b) The resonator setup with the RGM.

Fig. 7.
Fig. 7.

Efficiency curves for the three setups with their output far-field beam profile. The particular shapes of the curves are induced by the spectral shift of the pump diode despite the internal grating [9].

Fig. 8.
Fig. 8.

Measured spectra in both resonator configurations.

Tables (1)

Tables Icon

Table 1. Performances Outline of the Experimental Setups

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