Stimulated Raman Scattering (SRS) is an important nonlinear process in optical fibers that can realize the MIR wavelength shift from our existing pump source. In this paper, we experimentally investigated an efficient 2.19- and 2.42 μm cascaded Raman pulse fiber laser that was composed of 2 μm electronically modulated pulse source, one typically three-stage Tm-doped fiber amplifier and a segment of commercially nonlinear fiber. A simple single-pass configuration was built to avoid the bandwidth limitation of optical components for Raman pulse generation at longer wavelengths.
We numerically investigate a Raman soliton source cascaded by a fluorotellurite fiber and a chalcogenide fiber. By using a 2.8 μm fiber laser with a pulse width of 137 fs as the pump light, widely tunable Raman solitons spanning from 2.8 to 8.1μm are observed in the nonlinear media cascaded by 5 cm fluorotellurite fiber and 10 cm chalcogenide fiber. The pulse width of the red-shift soliton at 8.1 μm is 132 fs. For the first time we propose the idea of coupling the tellurite fiber and chalcogenide fiber to further enhance the SSFS effect in mid infrared region (MIR). Our simulated results show the possibility of generating long wavelength Raman soliton use a source cascaded by fluorotellurite fiber and chalcogenide fiber
In this work, we demonstrated a numerical model of 3.5 μm mid-infrared Er3+-doped ZBLAN fiber laser based on 655 nm and 1981 nm dual-wavelength pump(DWP) for the first time. Comparisons between simulation and experimental results are presented. And we optimize parameters such as fiber length, output coupler reflectivity and pumping method of two DWP schemes. Selecting the same 1981nm pump power, the output of parallel DWP scheme is larger under their respective optimal conditions.
We demonstrated a three-stage cascaded Raman soliton frequency shift structure in mid-infrared region (MIR) through numerical simulation. By cascading germania-core fiber, Er3+ ZBLAN fiber amplifier with an indium fluoride or (InF3) or TeO2-Bi2O3-ZnO-Na2O (TBZN) fiber, we achieved 2-4.75 μm and 2-5.5 μm tunable range respectively. When the same tunable range was achieved, both the energy and conversion efficiency of Raman solitons in the designed three stage cascaded structure were greatly improved, comparing with structure with single Raman shifter fiber. Our work could provide an effective way to improve the energy and conversion efficiency of Raman solitons in the commonly used single Raman frequency shift structure.
In this work, we employed a micro-electro-mechanical system (MEMS) mirror as the scanner to reduce the size of the opto-acuostic-fludic system. To evaluate the performance of this system, we imaged flowing droplets generated by Tjunction and flow focusing configurations. The results demonstrate the feasibility of this method in the study of droplet formation dynamics. We also imaged flowing magnetic microspheres to verify the influence of magnetic field. In the end, cancer cells were successfully detected in the microchannel to demonstrate the potential of this method in clinical applications.
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