双折射光子晶体光纤中超连续谱产生的实验研究

研究了30 fs激光在双折射光子晶体光纤中传输时，泵浦光功率和偏振态对超连续谱产生的影响。实验结果表明:随着泵浦光功率增加，光谱宽度显著增加，出现红移的光孤子和蓝移的色散波；当泵浦光的偏振态分别平行于光子晶体光纤长轴和短轴时，二者都有红移的光孤子和蓝移的色散波，但前者色散波波长更短；当泵浦光偏振态介于长轴与短轴之间，可能在色散波之外出现了交叉相位波，产生的超连续谱最强，且其近场光斑最大且最亮。

Experimental study on supercontinuum generation in birefringent microstructure fibers with 30 femtosecond pulse

The supercontinuum generation attracts more and more interest in nonlinear optical fields. The propagation of 30 fs pulse with different power and polarization state in the birefringent microstructure fibers for supercontinuum generation is studied experimentally. The experiment results show that when the injected power increases, the induced phase modulation is responsible for the initial spectral broadening, and then the fission of higher order solitons into redshifted fundamental solitons and the blueshift of dispersive wave generation attribute to the board supercontinuum generation. By rotating the input polarization of the pump femtosecond laser, besides the redshifted higher order solitons fission and blueshifted dispersive wave generation, when the polarization of the pump pulse is parallel to the long axis direction (namely the angle is 0), the center wavelength of the dispersive wave is shorter than the short-axiss (namely the angle is 90). When the polarization equals to 45, there may come forth the blueshifted cross-phase wave, and the light spot of the white-supercontinuum is the biggest in the near field distributions among the three polarization states of the pump laser.