This paper mainly studied the tensile strength of the splicing point of optical fibers. We analyzed the main factors that influence the tensile strength of the splicing point during the process of fiber splicing and post processing. The results demonstrate that it is the expansion of little cracks produced during fusion process that decreases the tensile strength of splicing point. We eliminated the cracks on the splicing point by using CO2 laser based on the principle of crack production and elimination. The experimental result shows that after eliminating the cracks the tensile strength of the splicing point is observably improved and it reaches more than 160kpsi.
This paper mainly studied the structure of high power pump combiner. Pump combiner is one of the key components of high power fiber laser and fiber amplifier. The ability to conduct high power of pump combiner is often influenced by the heat dissipation structure. The faster the heat dissipates the higher power the combiner conducts and the higher power fiber laser the combiner can be applied in. We made a pump combiner with the help of a conical quartz tube and the heat dissipation structure of the combiner can send away the lights that the combiner leaks so that the heat accumulation in the combiner can be avoided. The experimental result shows that when the pump power reaches 3000W the temperature of the combiner is about 28℃ which indicates that the heat dissipation efficiency of the structure is high.
Polarization maintenance fiber with high birefringence is an important goal for the development of high power fiber lasers. There are different ways to achieve high birefringence, such as change shape of a fiber’s core and apply stress to a fiber’s core. In this paper, fibers with different ovality of elliptical core are fabricated and tested. On the other hand, stress type PM fibers are also made, including PANDA type fibers and bowtie type fibers. Their test results are compared and analyzed together with their structures. Generally, the bowtie type fibers has highest birefringence, while the PANDA fibers are with high birefringence and high production efficiency. Different application can choose different type of PM Laser fibers.
This article analyzes the advantages and disadvantages of a packaging structure for pump coupler, where common heat conduction material is used. In this study, the possibility of using new technology of thermal conductivity is discussed. We also proposes a solution that make the function and effect of package more uniform. A serial of experiments are done for research the cooling effect and the working reliability of the fiber combiners and couplers. Experiment proves that after improved method of package, the cooling speed increases significantly comparing the sample with old type of package technique. The technique discussed in this paper will make the high power fiber laser working long time with steady power output and high efficiency.
We studied the coating technology, research shows that: to coat the internal structure of coupler we need to consider both intensity problem and heat dissipation problem. For instance: thicker coating will increase the coupler’s resistance to stress and resistance to water vapor, but we will prefer a thinner coating because it is easier to let the light pass though and generate less heat. We’ve tried a number of different coating materials, and analyzed the adhesion during its curing process. Finally, according to the experimental results, we believe that cooling capacity needs to be first considered. Recent experimental results show that we can use advanced coupler coating technology to extend the working life of the coupler. At the end of paper, we provide a coating example and show its real contribution to the working life.
Technique of residual cladding pump light detection in active fiber is researched, which is used in assembling the fiber laser system. With this technology, a fiber probe is used to detect the pump light leaking from the cladding with fiber’s coating on or stripped. It’s found that there is a linear relationship between leaking light power and pump light power, and the proportional coefficient is measured. Therefore, there’s no need to cut and fuse the active fiber many times to get the best length of active fiber, and it can save the measuring period and experiment expense a lot. Two types of fiber probes are used, tapered fiber probes and bevel fiber probes. The testing results of low light using these two fiber probes are given and the detecting method is verified.
In this contribution, optic fibers of a serial of doping proportions were prepared and tested. It’s found that B could decrease the sensitivity of refractive index to the temperature, and the sensitivity decreased 2% as the B’s molar percentage increased 1%. By comparing fiber samples’ test results, the proportion of Si: B: Ge to achieve the lowest Δn/ΔT was 0.75: 0.15: 0.1. After balancing the Δn/ΔT and loss, the recommended proportion of Si: B: Ge was given as 0.77: 0.15: 0.08. With this method, the optic fiber delay lines’ time delay could be reduced to 30 ps/km/°C, and their loss is lower than 0.5dB/km at 1550nm wavelength. Besides B and Ge, other kinds of elements are now being used to add into the fiber to improve the property of delay, and decay lines will make the photonic sensing more reliable and stable.
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