We describe a novel side-pumping configuration of the virtual-point-source diode-array-pumped Nd:YAG laser with 32 cw 10-W laser diodes. A new concept of the virtual point source and an image-relay system are proposed for the generation of a Gaussian-like pumping profile with an optically thin gain medium. A cw linearly polarized TEM00-mode, 26.5-W output was obtained at a diode pump power of 171 W. The M2 values at the x and y axes were measured to be Mx2=1.03 and My2=1.20, respectively.

© 1995 Optical Society of America

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Alfrey, A. J.

Bowers, M. S.

Byer, R. L.

Byers, R. L.

Farinas, A. D.

Freitag, I.

Golla, D.

Gustafson, E. K.

Kaneda, Y.

Knoke, S.

Kubota, S.

Magni, V.

Masuda, H.

Oka, M.

Schöne, W.

Seamans, J. F.

Shine, R. J.

Tidwell, S. C.

Tünnermann, A.

Welling, H.

Zellmer, H.

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Figures (4)

Fig. 1
Fig. 1

Experimental setup of the VPS 32 cw 10-W diode-array- pumped Nd:YAG laser. FT, flow tube; M1, 5-m radius-of-curvature high-reflectance mirror; M2, flat output coupler (77.5% reflectance).

Fig. 2
Fig. 2

Calculated pumping profiles in a Nd:YAG rod of 3.0-mm diameter for (a) the first pass, (b) the second pass, (c) the total passes.

Fig. 3
Fig. 3

Measured input and output characteristics. The open and filled circles show random-polarization operation (without a Brewster plate) and linear-polarization operation (with a Brewster plate), respectively. The maximum output power of 26.5 W with a cw linearly polarized TEM00 mode was obtained at a diode pump power (Pin) of 171 W.

Fig. 4
Fig. 4

Measured contour plot of the linearly polarized output beam 100 cm from the output mirror with a 26.5-W output power.

Equations (2)

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d ρ ( r ) d r = ρ ( r ) ( α - 1 r ) .
ρ ( r ) = ρ ( R ) R r exp [ α ( r - R ) ] ,