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High power or high energy solid-state lasers are required in many applications, but are limited in beam quality or brightness at high pump level by thermal effects. Beam combining with two lasers is an effective way to solve this problem and has been successfully realized in the past (Sabourdy et al., 2002; Sabourdy et al., 2003; Qinjun et al., 2005; Eckhouse et al., 2005). In order to get higher output energy with good beam quality, researchers often regard the two-channel combined configuration as the elementary laser and combine an even number of elementary lasers in a tree architecture (Sabourdy et al., 2002; Sabourdy et al., 2003; Qinjun et al., 2005). These direct extending schemes can successfully combine 2×N channel lasers into one beam intracavity, but the whole scaling geometry is really complicated and bulk, which bring more difficulties for alignment among multiple branches. Besides all these additions of laser beams are only obtained with spatial Gaussion beams(Sabourdy et al., 2002; Sabourdy et al., 2003; Qinjun et al., 2005), which limits the output power for scaling. Using a planar interferometric coupler, Ishaaya firstly reported intracavity beam addition of transverse multimode laser beam distributions (Ishaaya, et al., 2004), then more than two lasers combination has also been demonstrated (Eckhouse, et al., 2005; Eckhouse, et al., 2006). In these schems, the thick planar interferometric coupler with a high-precision plane is the key component. But it is difficult to fabricate this coupler, further, the intracavity loss will increase when multiple beams being combined. In addition, most of these more than two-channel combining schemes are based on the open-ended configuration (Sabourdy et al., 2002; Sabourdy et al., 2003; Qinjun et al., 2005; Eckhouse et al., 2005; Eckhouse, et al., 2006; Ishaaya, et al., 2004), if the symmetries of many branches are not well guaranteed, the loss will be unavoidably introduced from every open end of the beam splitter or coupler, consequently resulting in instability of the whole composite cavity. Generally speaking, these kinds of cavities are not very easy to implement at present. Recently, we have presented a new close-ended Four-Mirror Cavity to combine two beams with two gain media intracavity (Ming & Mali, 2007). Base on this, in this letter, we propose a novel and practical composite-cavity, named Six-Mirror Cavity, to combine four beams with four gain media intracavity. This cavity is based on a close-ended configuration, which makes the output very stable, even when multiple channels combining at the high pump level. Also, it is not the direct extending of the two-channel scheme as the conventional strategies, the Source: Advances in Solid-State Lasers: Development and Applications, Book edited by: Mikhail Grishin, ISBN 978-953-7619-80-0, pp. 630, February 2010, INTECH, Croatia, downloaded from SCIYO.COM

Efficient Intracavity Beam Combining of Multiple Lasers in a Composite Cavity