Design of compact dispersion interferometer with a high efficiency nonlinear crystal and a low power CO2 laser
Design of compact dispersion interferometer with a high efficiency nonlinear crystal and a low power CO2 laser
复制标题
高效非线性晶体和低功率CO2激光器的紧凑型色散干涉仪设计
DOI：
10.1088/1748-0221/12/12/c12028
复制
发表时间：
2017
影响因子：
1.3
通讯作者：
Urabe K.
中科院分区：
文献类型：
--
作者：
Akiyama T.;Yoshimura S.;Tomita K.;Shirai N.;Murakami T.;Urabe K.
用常规干涉仪测量高压环境中产生的等离子体的电子密度时，由于中性气体密度的变化而引起的相移会造成很大的测量误差。色散干涉仪测量介质的色散引起的激光基波和二次谐波之间的相移，可以抑制由于中性气体密度变化而测量的相移。近年来，CO2激光色散干涉仪已被应用于大气压等离子体中，并证明了其可行性。将低功率激光器和高效率的非线性晶体相结合用于二次谐波的产生，可以设计出紧凑的色散干涉仪。进行了光学设计和初步实验。
When the electron density of a plasma generated in high pressure environment is measured by a conventional interferometer, the phase shifts due to changes of the neutral gas density cause significant measurement errors. A dispersion interferometer, which measures the phase shift that arises from dispersion of medium between the fundamental and the second harmonic wavelengths of laser light, can suppress the measured phase shift due to the variations of neutral gas density. In recent years, the CO 2 laser dispersion interferometer has been applied to the atmospheric pressure plasmas and its feasibility has been demonstrated. By combining a low power laser and a high efficiency nonlinear crystal for the second harmonic component generation, a compact dispersion interferometer can be designed. The optical design and preliminary experiments are conducted.