Vergien Christopher, Dajani Iyad, Zeringue Clint
Advanced Electric Lasers Branch, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico 87117, USA.
Opt Express. 2010 Dec 6;18(25):26214-28. doi: 10.1364/OE.18.026214.
We analyze the scalability of amplifying the output from a single-frequency diode laser operating at 1178 nm through the utilization of a core pumped Raman fiber amplifier. A detailed model that accounts for stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) in relation to the fiber mode field diameter, length, seed power, and available pump power in both co-pumped and counter-pumped configurations is developed. The backward travelling Stokes light is initiated from both spontaneous Brillouin and spontaneous Raman processes. It is found that when fiber length is optimized, the amplifier output scales linearly with available pump power. Although higher amplifier efficiency is obtained with higher seed power, the output power diminishes. In order to mitigate the SBS process for further power scaling, we employ and optimize a multi-step temperature distribution. Finally, we consider the feasibility of generating the D(2a) and D(2b) lines in a sodium guide star beacon from a single Raman amplifier by examining four-wave mixing (FWM).
我们通过利用纤芯泵浦拉曼光纤放大器，分析了放大工作在1178纳米的单频二极管激光器输出的可扩展性。开发了一个详细模型，该模型考虑了在共泵浦和反泵浦配置中与光纤模场直径、长度、种子功率和可用泵浦功率相关的受激拉曼散射（SRS）和受激布里渊散射（SBS）。反向传输的斯托克斯光由自发布里渊和自发拉曼过程产生。研究发现，当光纤长度优化后，放大器输出与可用泵浦功率呈线性比例关系。虽然较高的种子功率可获得更高的放大器效率，但输出功率会降低。为了减轻SBS过程以实现进一步的功率扩展，我们采用并优化了多步温度分布。最后，我们通过研究四波混频（FWM），考虑了从单个拉曼放大器在钠导星信标中产生D(2a)和D(2b)线的可行性。
