Abstract
We have constructed a novel ring cavity for a double-clad
thulium-doped fiber laser, by placing the fiber’s 45° angle-polished
output end before the input end and relaunching the pump and the laser
power into the fiber. This design can reduce reabsorption by using
short fibers without loss of pump efficiency. The dependence of the
laser’s performance on the fiber’s length and the output coupler’s
reflectivity is investigated experimentally and theoretically. With
an 80-cm-long fiber, 2.7-W single-mode continuous-wave output is
generated for 11.5 W of launched pump power.
© 2001 Optical Society of America
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