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er, yb co-doped fiber for improving laser efficiency in 1.5μm band

A kind of optical fiber and laser technology, applied in the direction of multi-layer core/clad optical fiber, clad optical fiber, optical waveguide light guide, etc., can solve the problems of laser output power increase and overshoot, achieve suppression of parasitic oscillation, increase conversion efficiency, and widely The effect of practicality

Active Publication Date: 2019-03-05
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this also brings problems: In 2007, Y. Jeong et al. published the article "Erbium: Ytterbium Codoped Large-Core Fiber Laser" in IEEE Journal of SelectedTopics in Quantum Electronics, vol. With 297-W Continuous-Wave OutputPower" shows that although the maximum output power of the ~1.5 μm laser is 297 W, the output power of the ~1 μm laser is also as high as 338 W, which exceeds the output power of the ~1.5 μm laser, and, when After the parasitic oscillation in the ~1 μm band, the slope efficiency of the ~1.5 μm laser output drops from 40% to 19%
The main reason for this phenomenon is that during high power operation, Yb 3+ The generation of parasitic oscillations in the ~1 μm band limits the further improvement of the laser output power in the ~1.5 μm band

Method used

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  • er, yb co-doped fiber for improving laser efficiency in 1.5μm band
  • er, yb co-doped fiber for improving laser efficiency in 1.5μm band
  • er, yb co-doped fiber for improving laser efficiency in 1.5μm band

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Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0034] The technical indicators and basic performance parameters are as follows:

[0035] 1. Center axis offset .

[0036] 2. The diameter of the fiber core is 30 μm, the effective refractive index is 1.538, and the numerical aperture (NA) is 0.08.

[0037] 3. The diameter of the inner cladding is 400 μm, the effective refractive index is 1.536, and the numerical aperture (NA) is 0.4.

[0038] 4. The diameter of the outer cladding is 550 μm.

[0039] 5. The diameter of the coating layer is 700 μm.

[0040] At this time, the bending loss of the fiber at 1 μm and 1.5 μm varies with the pitch The theoretical simulation diagram of the change is shown in image 3 As shown, it can be clearly seen that when When , the fiber loss in the 1 μm band is greater than that in the 1.5 μm band, which can effectively suppress the parasitic oscillation in the 1 μm band.

Embodiment example 2

[0042] The structure of the spiral core fiber is as figure 1 and figure 2 shown, the center axis offset , at this time, the bending loss of the fiber at 1 μm and 1.5 μm varies with the pitch The theoretical simulation diagram of the change is shown in Figure 4 As shown, it can be clearly seen that when When , the fiber loss in the 1 μm band is greater than that in the 1.5 μm band, which can effectively suppress the parasitic oscillation in the 1 μm band.

Embodiment example 3

[0044] The structure of the spiral core fiber is as figure 1 and figure 2 shown, the center axis offset , at this time, the bending loss of the fiber at 1 μm and 1.5 μm varies with the pitch The theoretical simulation diagram of the change is shown in Figure 4 As shown, it can be clearly seen that when When , the fiber loss in the 1 μm band is greater than that in the 1.5 μm band, which can effectively suppress the parasitic oscillation in the 1 μm band.

[0045] In summary, the present invention proposes an Er, Yb co-doped helical core fiber, by adjusting the central axis offset Q and pitch P, the fiber loss corresponding to different wavelengths can be changed, so that the fiber loss in the 1 μm band is greater than The fiber loss in the 1.5 μm band achieves the effect of suppressing the parasitic oscillation of 1 μm.

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Abstract

The invention relates to an Er / Yb co-doped fiber for improving 1.5 mum laser efficiency, and is suitable for the laser communication field. The fiber comprises a fibre core, an inner wrapping layer, an outer wrapping layer and a coating layer from the inside out. The fibre core is formed by straight core and a section of spiral core; and fibre loss can be changed by adjusting spiral pitch of the spiral core and offset amount of a center shaft, and thus fibre loss in 1 mum wave band is allowed to be larger than fibre loss in 1.5 mum wave band. The features above allow the Er / Yb co-doped fiber to be applied to a high-power Er / Yb co-doped fiber laser, and thus the problem of 1 mum parasitic oscillation is effectively solved, and 1.5 mum laser output power is improved.

Description

technical field [0001] The invention relates to an Er, Yb co-doped optical fiber, in particular to an Er, Yb co-doped optical fiber for improving laser efficiency of ~1.5 μm in the technical field of laser communication. Background technique [0002] The ~1.5 μm band belongs to the eye-safe band and is in the atmospheric window, so lasers in this band are widely used in laser communication, ranging, medical treatment, industrial processing and other fields. The main method currently used to generate the ~1.5 μm band is doping Er 3+ Fiber lasers and bulk gain medium solid-state lasers. Compared with traditional bulk laser gain medium solid-state lasers, fiber lasers have the advantages of compact structure, good beam quality, high laser efficiency, and simple thermal management. The existing optical fiber structure includes a core, an inner cladding, an outer cladding, and a coating layer from the inside to the outside. 3+ The gain fiber has low absorption efficiency for p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036G02B6/02
CPCG02B6/02295G02B6/03633
Inventor 沈德元赵永光陈碧辉周伟陈浩
Owner XUZHOU NORMAL UNIVERSITY
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