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由直角梯形棱镜构成的环形谐振腔的输出信号在机械振动环境下会受到影响,使输出波形幅值产生调制。为了改善谐振腔输出信号质量,从工程探索的角度出发,首次将对称型全反射棱镜纳入谐振腔的结构设计方案中。通过理论计算和有限元分析的方法,对比了两种谐振腔的光线传输特性和应力分布。结果表明,对于传输波长为632.8 nm的激光谐振腔而言,对称型结构可以保证构成谐振腔的光学元件具有对称的应力分布,降低棱镜上的应力双折射效应,提高输出信号的稳定性。对称性棱镜环形谐振腔的激光传输轨迹更稳定,装配要求更宽松,应力极值仅为非对称结构的15%。通过对比,在一个激励周期内,对称型谐振腔的激光输出能量波动相比原始结构降低了52.63%,平稳性获得了显著的改善。使用对称型环形谐振腔,对于提高我国现阶段环形激光传感器件的输出稳定性提供了一种新的技术途径。
The output signal of the ring resonator formed by the right-angle trapezoidal prism is affected under the mechanical vibration environment and the output waveform amplitude is modulated. In order to improve the output signal quality of the resonant cavity, from the perspective of engineering exploration, the symmetrical total reflection prism is firstly incorporated into the structural design of the resonant cavity. By means of theoretical calculation and finite element analysis, the light transmission characteristics and stress distribution of the two resonant cavities are compared. The results show that the symmetrical structure can guarantee the symmetrical stress distribution of the optical components in the resonator and reduce the stress birefringence effect on the prism, which can improve the stability of the output signal for the laser cavity with wavelength of 632.8 nm. Symmetric prism ring resonator laser transmission trajectory more stable, more relaxed assembly requirements, stress extremes only 15% of the asymmetric structure. By contrast, in one excitation cycle, the laser output energy of the symmetrical resonator is reduced by 52.63% compared with the original structure, and the smoothness is significantly improved. The use of a symmetrical ring resonator provides a new technical approach for improving the output stability of the ring laser sensor device in our country.