基于光子晶体光纤和飞秒激光源的近红外波段宽带孤子和可见区高效色散波产生的实验

Experiment on the generation of broad band soliton and visible region highly efficient dispersion wave using photonic crystal fiber and femtosecond laser source

将钛宝石激光器产生的飞秒激光脉冲泵浦实验室自制的高非线性双折射光子晶体光纤,脉冲的中心波长为820 nm,位于光子晶体光纤的接近于零色散的反常色散区.实验结果表明:随着泵浦功率的增加,一阶孤子的中心波长发生了红移,同时产生的色散波的中心波长则发生蓝移进入可见光区.当泵浦功率达到0.45 W时,色散波与残余泵浦的输出功率比为42.67,色散波的带宽达到81 nm,而处于近红外波段的红移孤子带宽可达231 nm.利用高非线性光子晶体光纤产生近红外波段宽带孤子和可见区高效色敬波的实验对飞秒激光频率转换和光谱展宽具有很好的借鉴意义.

A high-linear birefringence photonic crystal fiber is pumped by a femtosecond laser pulse generated by Ti. sapphire laser. The center wavelength of the pulse is 820 nm, which is located in the anomalous dispersion region of the photonic crystal fiber near zero dispersion. Experimental results show that the central wavelength of soliton is red shifted while that of dispersion wave is blue shifted into the visible wavelength with the increase of pump power. When the average power of the pump is increased to 0.45 W, the ratio of the dispersive wave to the residual pump intensity can be up to 42.67, while the spectral width of dispersion wave is broadened to 81 nm as well as the soliton bandwidth to 231 nm. Near infrared broad soliton and the highly efficient dispersive wave in the visible region was generated in the high nonlinear photonic crystal fiber, which provides an important reference for the frequency conversion and spectral broadening of the femtosecond laser.