Abstract
In this paper, we present a study of thermal, average power scaling, change in index of refraction and stress in photonic crystal fiber lasers with different pump schemes: forward pump scheme, backward pump scheme, forward pump scheme with reflection of 98%, backward pump scheme with reflection of 98% and bi-directional pump scheme. We show that management of thermal effects in fiber lasers will determine the efficiency and success of scaling-up efforts. In addition, we show that the most suitable scheme is the bi-directional.
Highlights
The superiorities of the conventional solid-state and gas lasers make Yb3+ doped fibers lasers reported [1]-[4]
We expect that changes in the index of refraction due to the stress-optic effect will be negligible in different pump schemes, and thermally induced birefringence will be absent in fiber lasers, the stress component σ z (r ) increases with the increase of the length the fiber in the cases and decreases along the fiber laser in the cases
We have investigated a comparison of stress and thermo-optic of photonic crystal fiber (PCFs) in different pump schemes
Summary
The superiorities of the conventional solid-state and gas lasers make Yb3+ doped fibers lasers reported [1]-[4]. We expect that changes in the index of refraction due to the stress-optic effect will be negligible in different pump schemes, and thermally induced birefringence will be absent in fiber lasers (in all cases of pumping), the stress component σ z (r ) increases with the increase of the length the fiber in the cases (forward pump schemes) and decreases along the fiber laser in the cases (backward pump schemes). These values are between −0.4 × 10−6 kg/m2 and −3.4 × 10−6 kg/m2 in the four primer cases.
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