More than 200 W random Raman fiber laser with ultra-short cavity length based on phosphosilicate fiber.

Abstract

An over 200W high-power first-order random Raman fiber laser (RRFL) at 1238nm is demonstrated. The laser is based on a half-open cavity with a piece of 30m phosphosilicate fiber. This RRFL is pumped by a conventional 1064nm Yb-doped fiber laser. After suppressing the silica Raman component, a maximum output power of 206.7W is obtained with a full width half-maximum linewidth of 7.1nm at a pump power of 346.3W, corresponding to an optical-to-optical efficiency of 59.7%. To the best of our knowledge, this is the highest reported output power of RRFL on the basis of phosphosilicate fiber with the shortest cavity length.