Patent ID: 9020007
Filing Date: 2015-04-28
Classification: H01S

Abstract:
1. A laser device comprising: an optical fiber which includes a core and a clad and through which seed light and pumping light propagate; a glass rod which is doped with rare earth elements and has a larger diameter than that of the core; and a lens arranged between an input end surface of the glass rod and the optical fiber, wherein the seed light and the pumping light output from the optical fiber are input to the lens to have increased diameters and then output from the lens, and the seed light and the pumping light output from the lens are input to the glass rod, and output light including at least the amplified seed light is output from the glass rod, wherein at least the seed light with increased diameter is output from the lens as collimated light, wherein the seed light output from the lens is input to the glass rod to propagate through the glass rod in parallel to a longitudinal direction of the glass rod, and wherein the diameter of the pumping light is larger than that of the seed light when the pumping light and the seed light enter the glass rod from the lens.