Abstract

By using quite uniformly nine-stacks side-around arranged compact pumping system, a high power Nd:YAG ceramic quasi-CW laser with high slope efficiency of 62% has been demonstrated. With 450 W quasi-CW stacked laser diode bars pumping at 808 nm, performance of the Nd:YAG ceramic laser with different output coupling mirrors has been investigated. Optimum output power of 236 W at 1064 nm was obtained and corresponding optical-to-optical conversion efficiency was as high as 52.5%. The laser system operated quite stably and no saturation phenomena have been observed, which means higher output laser power could be obtained if injecting higher pumping power. The still-evolving Nd:YAG ceramics are potential super excellent media for high power practical laser applications.

© 2005 Optical Society of America

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References

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Appl. Phys. B

J. Lu, M. Prabhu, J. Song, C. Li, J. Xu, K. Ueda, A. A. Kaminshii, H. Yagi, and T. Yanagitani, �??Optical properties and highly efficient laser oscillation of Nd:YAG ceramics,�?? Appl. Phys. B 71, 469-473 (2000).
[CrossRef]

Appl. Phys. Lett.

J. Lu, T. Murai, K.Takaichi, T. Uematsu, K. Misawa, M. Prabhu, and J. Xu, �??72 W Nd:Y3Al5O12 ceramic laser,�?? Appl. Phys. Lett. 78, 3586-3588 (2001).
[CrossRef]

IEEE J. Quantum Electron.

G. A. Kumar, J. Lu, A. A. Kaminskii, K. Ueda, H. Yagi, T. Yanagitani, and N. V. Unnikrishnan, �??Spectroscopic and Stimulated Emission Characteristics of Nd3+ in Transparent YAG Ceramics,�?? IEEE J. Quantum Electron. 40, 747-758 (2004)
[CrossRef]

J. Alloy. Compd.

J. Lu, K. Ueda, H. Yagi, T. Yanagitani, Y. Akiyama, and A. A. Kaminshii, �??Neodymium doped yttrium aluminum garnet (Y3Al5O12) nanocrystalline ceramics�??�??a new generation of solid state laser and optical materials,�?? J. Alloy. Compd. 341, 220-225 (2002).
[CrossRef]

J. Am. Ceram. Soc.

A. Ikesue, T. Kinoshita, K. Kamata, and K. Yoshida, �??Fabrication and Optical Properties of High-Performance Poolycrystalline Nd:YAG Ceramics for Solid-State Lasers,�?? J. Am. Ceram. Soc. 78, 1033-1040 (1995).
[CrossRef]

J. Appl. Phys.

J. B. Gruber, D. K. Sardar and R. M.Yow, �??Energy-level structure and spectral analysis of Nd3+ (4f3) in polycrystalline ceramic garnet Y3Al5O12,�?? J. Appl. Phys. 96, 3050-3056 (2004).
[CrossRef]

J. Cryst. Growth

R.R. Monchamp, �??The distribution coefficient of neodymium and lutetium in Czochralski grown Y3Al5O12,�?? J. Cryst. Growth 11, 310-312 (1971).
[CrossRef]

Japanese patent (24 September 1996).

T. Yanagiya, H. Yagi, and A. Ichikawa, "Production of yttrium-aluminum-garnet fine powder," Japanese patent (24 September 1996).

Japanese patent: (24 September 1996)

T. Yanagiya, H. Yagi, and H. Yamazaki, �??Production of fine power of yttrium aluminum garnet,�?? Japanese patent: (24 September 1996).

Jpn. J. Appl. Phys.

J. Lu, J. Song, M. Prabhu, J. Xu, K. Ueda, and H. Yagi, �??High-power Nd:Y3Al5O12 Ceramic Laser,�?? Jpn. J. Appl. Phys. 39, 1048-1050 (2000).
[CrossRef]

Laser. Phys.

J. Lu, M. Prabhu, K. Ueda, H. Yagi, T. Yanagitani, A. Kudryashov, and A. A. Kaminshii, �??Potential of Ceramic YAG Lasers,�?? Laser. Phys. 11, 1053-1057 (2001).

Mater. Sci. Res.

E. Carnall, S. E. Hatch, and W. F. Parsons, �??Optical Studies on Hot-Pressed. Polycrystalline CaF2 with Clean Grain Boundaries,�?? Mater. Sci. Res. 3, 165-173 (1966).

Opt. Lett.

Opto & Laser Europe, (2001)

�??Ceramic YAGs set to challenge single crystals,�?? Opto & Laser Europe, (2001) <a href="http://optics.org/articles/ole/6/12/5">http://optics.org/articles/ole/6/12/5</a>.

Other

Baikowski. Ceramic YAG technical datasheet [EB/OL]. <a href="http://www.baikowski.com/components/pdf/ceramic_yag/YAG_DATA_SHEET.pdf">http://www.baikowski.com/components/pdf/ceramic_yag/YAG_DATA_SHEET.pdf</a> (2003).

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Figures (6)

Fig. 1.
Fig. 1.

Schematic diagram of experimental setup for side-pumped Nd:YAG ceramic rod laser.

Fig. 2.
Fig. 2.

Cross-section of large diode arrays compact side-pumped Nd:YAG ceramic laser head.

Fig. 3.
Fig. 3.

2D Contour plot of pump intensity distribution simulated by computer with ray tracing method.

Fig. 4.
Fig. 4.

Output power versus pump power for Nd:YAG ceramic laser with different coupling mirrors.

Fig. 5.
Fig. 5.

Comparing output power of Nd:YAG ceramic and Nd:YAG single crystal at the same condition.

Fig. 6.
Fig. 6.

Two and three-dimensional beam profiles o of a 236W Nd:YAG ceramic laser from CCD.

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