Maximum Pump Power Coupled in Raman Resonator for Maximum Power Delivered at 1115 and 1175 nm

Abstract

In this report, we present our analysis of the relationship between critical power and stimulated Raman scattering in Raman fiber lasers. Through our research, we have established a connection between the R.G. Smith constant at critical power and the necessary pump power required to reach the maximum power delivered by the first Stokes just prior to the generation of the second Stokes. In our experiments, two setups were successful in reaching the second Stokes generation, one utilizing a glass–air interface as the output coupler without HR mirrors and the other using HR-FBGs for both Stokes in conjunction with a glass–air interface. We found that the 1 Km 1060-XP fiber has an R.G. Smith constant of ~4.94 at critical power, which when multiplied by 2 gives ~9.88, a value close to the R.G. Smith constant (9.75) for maximum Stokes corresponding to a pump power of 5.5 W, with an approximation of ~98.6%. Our results demonstrate the importance of knowing the R.G. Smith constant at critical power in estimating the necessary pump power to achieve maximum power delivery in any Stokes component.

Engineering and Applied Sciences

“…To corroborate the efficiency of the simulation, two types of silica fibers used in telecommunications were considered: 1060XP and LEAF, both with experimental results already published in (de la Cruz May et al, 2023), each with different lengths. As can be seen in Figure 2, each of them was subjected to a special configuration, the LEAF fiber was analyzed under the free running configuration and the 1060XP fiber in a configuration applying Bragg gratings with the aim of speeding up Stokes' generation.…”

“…Comparing the simulation with these experimental results under specific conditions will allow us to see the scope of the simulation. Based on the experimental data published on the 1060XP fiber obtained by (de la Cruz May et al, 2023;Juárez-Hernández et al, 2016) using a coupled power of 8 W it is possible to obtain 2 Stokes as seen in the Graph 1. When comparing with the simulation result, a 92% agreement was achieved in the Stokes generation, but the spectra obtained with the simulation present a small gap with respect to the coupled power.…”

“…However, the simulation for the 1060XP fiber was not able to fully reproduce the experimental results, due to the incorporation of Bragg gratings in the optical fiber, which for the development of the experiment is advantageous due to the faster obtaining of the Stokes generation; however, it causes a delay in pump depletion which could also be due to the limited length of the study fiber which turns out to be very short. In the case study of the LEAF fiber based on the results published in (de la Cruz May et al, 2023;Juárez-Hernández et al, 2016), a free running configuration was used with a length even longer than in the 1060XP fiber, the comparison with the experimental data and the simulation results contemplates a coupled power of 4 W that allows the generation of the first and second Stokes as can be seen in Graph 2. With these results, we managed to reproduce the experimental results of Stokes generation for the first and second Stokes.…”