Hu Jonathan, Menyuk Curtis R, Wei Chengli, Brandon Shaw L, Sanghera Jasbinder S, Aggarwal Ishwar D
Opt Lett. 2015 Aug 15;40(16):3687-90. doi: 10.1364/OL.40.003687.
We computationally investigate cascaded amplification in a three-level mid-infrared (IR) Pr(3+)-doped chalcogenide fiber amplifier. The overlap of the cross-sections in the transitions (3)H(6)→(3)H(5) and (3)H(5)→(3)H(4) enable both transitions to simultaneously amplify a single wavelength in the range between 4.25 μm and 4.55 μm. High gain and low noise are achieved simultaneously if the signal is at 4.5 μm. We show that 45% of pump power that is injected at 2 μm can be shifted to 4.5 μm. The efficiency of using a mid-IR fiber amplifier is higher than what can be achieved by using mid-IR supercontinuum generation, which has been estimated at 25%. This mid-IR fiber amplifier can be used in conjunction with quantum cascade lasers to obtain a tunable, high-power mid-IR source.
我们通过计算研究了三能级中红外（IR）掺Pr(3+)硫族化物光纤放大器中的级联放大。(3)H(6)→(3)H(5)和(3)H(5)→(3)H(4)跃迁中截面的重叠使得这两个跃迁能够同时放大4.25μm至4.55μm范围内的单一波长。如果信号位于4.5μm，则可同时实现高增益和低噪声。我们表明，在2μm处注入的泵浦功率的45%可以转移到4.5μm。使用中红外光纤放大器的效率高于使用中红外超连续谱产生的效率，后者估计为25%。这种中红外光纤放大器可与量子级联激光器结合使用，以获得可调谐的高功率中红外光源。
