Abstract

We report efficient operation of a KGd(WO4)2 Raman laser pumped by a small, 1 W, 532 nm laser module. By changing the output coupler and Raman crystal orientation, more than 8 wavelengths in the yellow-to-red spectral region were generated including 555 nm, 559 nm, 579 nm, 589 nm, 606 nm, 622 nm, 636 nm and 658 nm, ie., the first 4 Stokes orders on the two orthogonal high-gain Raman shifts of KGd(WO4)2. We have also demonstrated spectrally pure output (typically >90% pure) for selected Stokes order with output power up to 400 mW. High slope efficiency (up to 68%) and high beam quality (M2~1.5) of Stokes output are obtained even at the highest pump power.

© 2004 Optical Society of America

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References

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    [CrossRef]

Opt. Commun.

C. He and T.H. Chyba, �??Solid-state barium nitrate Raman laser in the visible region,�?? Opt. Commun. 135, 273-8, (1997).
[CrossRef]

Opt. Eng.

I.V. Mochalov, �??Laser and nonlinear properties of the potassium gadolinium tungstate laser crystal KGd(WO4)2:Nd3+-(KGW:Nd),�?? Opt. Eng. 36, 1660�??9, (1997).
[CrossRef]

Opt. Lett.

J. Richards and A. McInnes, �??Versatile, efficient, diode-pumped miniature slab laser,�?? Opt. Lett. 20, 371-3, (1995).
[CrossRef] [PubMed]

Y. Urata, S. Wada and H. Tashiro, �??Doping of absorbent into a Raman crystal fro suppression of higher-order Stokes generation,�?? Opt. Lett. 25, 752-755, (2000).
[CrossRef]

H.M. Pask and J.A. Piper, �??Efficient all-solid-state yellow laser producing 1.2W average power,�?? Opt. Lett. 24, 1490�??2, (1999).
[CrossRef]

H.M. Pask, S. Myers, J.A. Piper, J. Richards and T. McKay, �??High average power, all-solid-state external resonator Raman laser,�?? Opt. Lett. 28, 435-7, (2003).
[CrossRef] [PubMed]

Opt. Mater.

P.G. Zverev, T.T. Basiev and A.M. Prokhorov, �??Stimulated Raman scattering of laser radiation in Raman crystals,�?? Opt. Mater. 11, 335-352, (1999).
[CrossRef]

Prog. Quantum Electron.

H.M. Pask, �??The design and operation of solid-state Raman lasers,�?? Prog. Quantum Electron. 27, 3-56, (2003).
[CrossRef]

Other

R.W. Boyd, Nonlinear Optics, (Academic, San Diego, 1992).

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Figures (3)

Fig. 1.
Fig. 1.

The experimental arrangement showing the folded Raman resonator, 532nm pump laser, half-wave plate, and focusing lens. (O/C output coupler, HR high reflector)

Fig. 1.
Fig. 1.

Output power dependence on the 532nm pump power incident on the Raman crystal for the resonator configurations corresponding to maximum second-Stokes output (both crystal orientations shown).

Fig. 2.
Fig. 2.

Near field beam profile for second-Stokes output (ie., largely 589nm output) at maximum pump power.

Tables (1)

Tables Icon

Table 1. The output performance, spectral content and output couplings for maximum overall efficiency at each of the first 4 Stokes orders and for the two orthogonal orientations of the Raman crystal

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