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采用时域有限差分法(FDTD),在微米量级下,模拟了微纳光纤对于光束质量的改善情况。实验中所使用的微纳光纤是采用火焰熔融拉锥法,将单模光纤熔融拉锥制成的,并采用CCD测量光束质量因子M2,对比测量了光束通过普通单模光纤和熔锥微纳光纤的光束质量。实验结果显示,与普通单模光纤相比,熔锥微纳光纤可以改善光束质量。实验与FDTD模拟计算得到的结果相一致。
Using time-domain finite difference method (FDTD), the improvement of the beam quality of micro / nanofiber is simulated under the micron order. The micro-nano optical fiber used in the experiment is made by melting and tapering the single-mode optical fiber using a flame melting taper method. The quality factor M2 of the laser beam is measured by a CCD, and the light beam passing through the ordinary single-mode optical fiber and the fused cone micro- Optical fiber beam quality. Experimental results show that, compared with ordinary single-mode fiber, fused cone micro-nano fiber can improve the beam quality. The experiment is consistent with the FDTD simulation.