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首页> 外文期刊>東北大学電通谈话会記録 >Research on Tunable Mid-infrared Generation Employing Nonlinear Optical Processes
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Research on Tunable Mid-infrared Generation Employing Nonlinear Optical Processes

机译：利用非线性光学过程的可调谐中红外发生器研究

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摘要

Designs of parametric oscillation and mixing processes are described for generating widely tunable mid- infrared radiation. Detailed study and measurements are presented which signifies the usefulness of mid-ir source composed of an optical parametric oscillator (OPO) and difference frequency generator (DFG). The design of the angle tuned LiNbO_3 optical parametric oscillators have been optimized and their performances have been tested by difference frequency mixing of the OPO output waves in a second nonlinear crystal. The 1.75 -- 2.02 μm tuning range of parametric oscillator has been extended to 5 - l2μm and 5 -- l8 μ by difference frequency mixing in AgGaS_ and AgGaSe_ crystals, respectively. For efficient different frequency generation the parametric oscillation output beam should exhibit low beam divergence and should have narrow spectral linewidth. Beam divergence has been reduced by employing unstable resonator fOr the OPO, and this OPO is injection seeded by another OPO of narrower linewidth, to force the former to oscillate in narrow spectral range. Using the narrow-linewidth low- divergence output from the OPO, maximum DFG conversion efficiency with a 2-cm-long AgGaSe_2 crystal obtained is about 3.6% at around 7.5 μm.
机译：描述了用于产生可广泛调谐的中红外辐射的参数振荡和混合过程的设计。进行了详细的研究和测量，这表明由光学参量振荡器（OPO）和差频发生器（DFG）组成的中红外光源的实用性。角度调谐LiNbO_3光学参量振荡器的设计已得到优化，并且通过在第二个非线性晶体中对OPO输出波进行差频混合来测试其性能。通过分别在AgGaS_和AgGaSe_晶体中进行差频混合，参数振荡器的1.75-2.02μm调谐范围已扩展到5-12μm和5-18μm。为了有效地产生不同的频率，参量振荡输出光束应表现出较低的光束发散度并应具有较窄的光谱线宽。通过使用不稳定的OPO谐振腔可以减小光束发散，该OPO由另一种较窄线宽的OPO注入，以迫使前者在较窄的光谱范围内振荡。使用OPO的窄线宽低散度输出，获得的2cm长的AgGaSe_2晶体的最大DFG转换效率约为7.5μm，约为3.6％。

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