I developed a high power thulium fiber linear cavity with that can generate only 25% efficiency (FBG 1950 nm high reflection and low reflection equipped). Based from literature review maximum efficiency from thulium fiber laser is around 60%. The low efficiency maybe due to the mismatch core and cladding diameter between pump combiner output fiber (DCF-UN-8/125, NA 0.14/0.46) and active fiber (SM-TDF-10p/130-M). Since I am still new in high power fiber laser field so I run the experiment using available component in my lab. There are no equipment to test if my assumption is right or wrong. the splicer for this setup is fitel s178 a ver 2. There are few question that i have in mind.
is there anywhere to have better efficiency with core and diameter mismatch?
Is the fusion splicer used in by the fitel really core align the fiber? Is it better to use custom splice?
Does fiber end caped used in most of the literature?
any of your answer will be much appreciate. thank you
1. I think you need to check you fiber length, the fiber of FBG, and the position of your FBG in the cavity. If your the fiber of your FBG is matched with your Tm fiber, then you can put the combiner outside of your laser cavity. You also need to check your combiner, if it is designed for 1um, then it can not work at 2um.
2. For 10P/130 fiber I think splicer will not have big influence.
3. Don't need end cap, in your case. Power is not so high.
Thank for the response. May I know how do you fusion splice between the active fiber and passive fiber in high power application. Is there a special technique in or default single mode fusion setup is already suitable for this kind of splice. If the technique is confidential its okay for me. At least i know that the single mode splice is not suitable.
typically we will place the active fiber symmetrically up and down, taking the edge of the octagon as a reference. But for single mode fiber you don't need.
if your splicer has a rotary alignment mode, then try.
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