Abstract

We report on the design, fabrication, and implementation of grating-waveguide structures (GWS) for intracavity polarization and wavelength selection as well as wavelength tuning. The GWS discussed in this Letter is a combination of a low-index leaky-mode waveguide, a subwavelength diffraction grating, and a highly reflective mirror that was designed to operate in Littrow configuration. Using our device as the end mirror of an Yb:YAG thin-disk laser allowed the extraction of beams that exhibit an extremely narrow laser emission bandwidth of 25pm FWHM and a high degree of linear polarization of 99±0.5%. Moreover, the GWS allows a wavelength tuning range from 1007 to 1053 nm. The high-power suitability and the low loss of the GWS was demonstrated by the intracavity use in an Yb:YAG thin-disk laser with an output power of 325 W in multimode operation (M2=6) and with 110 W in fundamental-mode operation (M21.2), exhibiting optical efficiencies of 53.2% and 36.2%, respectively. An output power of 1.8 kW, corresponding to a power density of 125 kW/cm2 on the grating, was achieved in further higher-power experiments.

© 2012 Optical Society of America

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References

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2011 (1)

2007 (1)

2005 (2)

2000 (1)

A. V. Tishchenko and V. A. Sychugov, Opt. Quantum Electron. 32, 1027 (2000).
[CrossRef]

Abdou Ahmed, M.

Baum, A.

A. Baum, D. Grebner, W. Paa, W. Triebel, M. Larionov, and A. Giesen, Appl. Phys. B 81, 1091 (2005).
[CrossRef]

Butze, F.

Destouches, N.

Giesen, A.

C. Stolzenburg, A. Giesen, F. Butze, P. Heist, and G. Hollemann, Opt. Lett. 32, 1123 (2007).
[CrossRef]

A. Baum, D. Grebner, W. Paa, W. Triebel, M. Larionov, and A. Giesen, Appl. Phys. B 81, 1091 (2005).
[CrossRef]

Graf, Th.

Grebner, D.

A. Baum, D. Grebner, W. Paa, W. Triebel, M. Larionov, and A. Giesen, Appl. Phys. B 81, 1091 (2005).
[CrossRef]

Haefner, M.

Heist, P.

Hollemann, G.

Larionov, M.

A. Baum, D. Grebner, W. Paa, W. Triebel, M. Larionov, and A. Giesen, Appl. Phys. B 81, 1091 (2005).
[CrossRef]

Osten, W.

Paa, W.

A. Baum, D. Grebner, W. Paa, W. Triebel, M. Larionov, and A. Giesen, Appl. Phys. B 81, 1091 (2005).
[CrossRef]

Parriaux, O.

Pommier, J. C.

Pruss, Ch.

Reynaud, S.

Stolzenburg, C.

Sychugov, V. A.

A. V. Tishchenko and V. A. Sychugov, Opt. Quantum Electron. 32, 1027 (2000).
[CrossRef]

Tishchenko, A. V.

Tonchev, S.

Triebel, W.

A. Baum, D. Grebner, W. Paa, W. Triebel, M. Larionov, and A. Giesen, Appl. Phys. B 81, 1091 (2005).
[CrossRef]

Vogel, M. M.

Voss, A.

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Figures (7)

Fig. 1.
Fig. 1.

Schematic principle of leaky-mode GWS.

Fig. 2.
Fig. 2.

Measured and simulated efficiency of the 1st TE diffraction order under Littrow configuration.

Fig. 3.
Fig. 3.

SEM pictures of GWS.

Fig. 4.
Fig. 4.

Experimental thin-disk laser setups with the GWS as the end mirror.

Fig. 5.
Fig. 5.

Performance of the laser with the GWS end mirror in multimode (left) and fundamental-mode (right) operation.

Fig. 6.
Fig. 6.

Tuning behavior of the fundamental mode setup with 2% of output coupling.

Fig. 7.
Fig. 7.

Laser emission spectra in (almost) fundamental-mode operation at 110 W of output power (left) and in multimode operation at 325 W of output power (right) depending on the type of the resonator end mirror (GWS or standard HR).

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