Patent ID: 7336690

Claim:
A solid-state laser system, comprising: a first pumping laser unit including a first solid-state laser medium and a first light source configured to pump the first solid-state laser medium to emit a light beam from a first and a second end of the first solid-state laser medium; a totally reflecting mirror positioned on an optical path at a first predetermined optical distance from the first end of the first solid-state laser medium to receive the light beam; a partially reflecting mirror positioned on the optical path at a second predetermined optical distance from the second end of the first solid-state laser medium to receive the light beam; an optical element positioned on the optical path between the totally reflecting mirror and the first end of the first solid-state laser medium at a third predetermined optical distance from the first end of the first solid-state laser medium; and a second pumping laser unit positioned on the optical path between the partially reflecting mirror and the second end of the first solid-state laser medium and including a second solid-state laser medium and a second light source configured to pump the second solid-state laser medium to emit a light beam from a first and a second end of the second solid-state laser medium, the first end of the second pumping laser unit facing the second end of the first pumping laser unit, wherein the first and second pumping laser units are positioned so there is a point halfway between the second end of the first solid-state laser unit and the first end of the second solid-state laser unit designated as a centerpoint, and the first and third predetermined optical distances are established to cause a light beam traveling to the totally reflecting mirror to be optically conjugated with a light beam traveling from the totally reflecting mirror at a position between the optical element and the first end of the first solid-state laser medium, the position being located at a distance from the centerpoint equal to a distance between the centerpoint and the partially reflecting mirror and being defined as a virtual mirror position; and wherein the optical element has a focal length of f, a curvature of the totally reflecting mirror is R, a distance between the virtual-mirror position and the optical element is L 1 , and a distance between the optical element and the totally reflecting mirror is L 2 , such that: L 1 =f(f+R)/R, and L 2 =f+R.