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提出了基于液晶相位延迟的用于相干反斯托克斯拉曼散射(CARS)激发源的斯托克斯光的快速宽范围波长电调谐方法。数值仿真分析了脉冲的峰值功率和光子晶体光纤(PCF)长度对光孤子自频移(SSFS)频移量的影响,计算结果表明对2m长的PCF,注入光脉冲的峰值功率为2.7kW时,可探测波数为3509cm-1。基于液晶相位延迟器构建了快速波长调谐装置并搭建了实验系统,实验结果表明波长切换响应时间可达0.165ms,对1.98m长的PCF注入峰值功率范围为0.108~2.517kW的光脉冲时,基阶孤子中心波长调谐范围为807~1064nm,理论可探测波数范围为432~3422cm-1。
A fast and wide-range wavelength electrical tuning method for Stokes light for coherent anti-Stokes Raman scattering (CARS) excitation source based on liquid crystal phase retardation is proposed. The effect of pulse peak power and photonic crystal fiber (PCF) length on the frequency shift of optical soliton self-frequency shift (SSFS) is analyzed numerically. The calculated results show that for 2m PCF, the peak power of implanted light pulse is 2.7kW , Can detect wave number 3509cm-1. The fast wavelength tuning device and the experimental system are built based on the liquid crystal phase retarder. The experimental results show that the wavelength switching response time can reach 0.165ms. When injecting the 1.98m long PCF into the optical pulse with the peak power of 0.108 ~ 2.517kW, The wavelength tuning range of order soliton center is 807 ~ 1064nm, and the theoretically detectable wave number range is 432 ~ 3422cm-1.