Patent ID: 8442089
Filing Date: 2013-05-14
Classification: H01S

Abstract:
1. A laser device comprising: an optical fiber which includes a core and a clad surrounding the core and through which a seed light and a pumping light propagate; and a glass rod which is disposed at one end of the optical fiber, doped with rare earth elements and has a larger diameter than that of the core wherein the glass rod includes an input end surface and an output end surface opposite to the input end surface, wherein the seed light and the pumping light output from the optical fiber are input to the glass rod at the input end surface, wherein the glass rod is configured by a GRIN lens having the same length, between the input end surface and the output end surface, as odd multiple of 0.25 pitch defined by fluctuation of the seed light, wherein the seed light is amplified while the diameter of the seed light is increased, and wherein output light including at least the amplified seed light with the increased diameter is output from the glass rod at the output end surface.