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中红外激光在激光医疗、激光光谱学和红外对抗等领域有着广泛的应用前景.为了获得结构紧凑、便携性好的中红外激光源,采用975nm半导体激光器泵浦高掺铒氟化物双包层光纤实现了2.8μm的中红外光纤激光输出.将光纤耦合输出的中心波长为975nm的半导体激光,经过消像差非球面透镜系统耦合进双包层光纤,激光谐振腔由高反镜和具有4%菲涅耳反射率的光纤端面组成,当注入到增益光纤的泵浦功率高于0.37 W时,获得了中红外激光输出.实验结果表明:中红外光纤激光器中心波长为2.785μm,谱宽0.9nm;工作阈值为0.37W,最大输出功率为0.98W,斜率效率为17%,激光工作模式为单模.利用高掺杂浓度铒离子间的能量转移上转换,获得了高效率瓦级单模中红外光纤激光输出.
Mid-infrared laser has a wide range of applications in the field of laser medical treatment, laser spectroscopy and infrared confrontation.In order to obtain a compact and portable mid-infrared laser source, a 975nm semiconductor laser is used to pump high erbium fluoride double clad fiber The output of mid-infrared fiber laser is 2.8μm.The semiconductor laser whose central wavelength is 975nm which is coupled out of the fiber is coupled into the double-clad fiber through the astigmatism aspheric lens system.The laser resonator consists of a high reflector and a 4% Fresnel reflectivity, the mid-infrared laser output is obtained when the pumping power injected into the gain fiber is higher than 0.37 W. The experimental results show that the mid-infrared fiber laser has a center wavelength of 2.785 μm and a spectral width of 0.9 nm , The working threshold is 0.37W, the maximum output power is 0.98W, the slope efficiency is 17%, and the laser operating mode is single mode. By using energy transfer up-conversion between erbium ions with high doping concentration, Infrared fiber laser output.