提出一种研制光子晶体光纤（PCF）的氢氟酸填充腐蚀新方法。该方法将氢氟酸填充于已拉制的光子晶体光纤空气孔中,通过改变其横截面结构,研制具有特定结构的光子晶体光纤,改变其导光性能。研究表明,随着对光子晶体光纤空气孔腐蚀程度的加深,其泄露损耗和散射损耗不断减小,非线性系数明显提高,纤芯基模的有效折射率和包层的等效折射率相应减小,群速度色散也随之改变。

We introduce a new fabrication method for photonic crystal fibers (PCFs) using the hydrofluoric acid’s corrosive property. The transversal structure of a PCF can be changed by filling its air-holes with hydrofluoric acid, which corrodes the glass wall around and therefore widens the air-holes. By accurately controlling the hydrofluoric acid corrosion time, we can enlarge the air holes up to millimeter precision. This method can be used as a supplement of the traditional fusing-drawing technology to realize more complicated structures of PCFs in practice. Meanwhile, this method greatly modifies the light-guiding properties of PCFs. Experimental results indicate that, with the increase of corrosion time, the leakage loss and the scattering loss will decrease, the nonlinear coefficient will increase, the effective refractive index of fundamental mode and the equivalent refractive index of cladding will decrease, and the group velocity dispersion will be modified accordingly.