单模石英光纤受激拉曼散射温度特性研究

研究了在不同温度下单模石英光纤的受激拉曼散射光谱,从实验和理论上分析了温度对拉曼散射光谱特性的影响,在脉冲调Q倍频YAG激光的泵浦作用下,获得了石英光纤一级斯托克斯光的拉曼频移、带宽及光强随温度的变化规律.实验表明随着温度的升高,拉曼频移逐渐增大,在一定的温度范围内拉曼频移和温度成线性关系.在相同的泵浦功率作用下,当温度较低时,拉曼光谱的级次较低,低温对高阶斯托克斯光有抑制作用;温度越低其阈值越高;而拉曼光谱的谱线宽度随温度的变化不是线性的,存在一个谱线宽度极大值点.理论和实验表明温度对光纤受激拉曼散射的光谱特性有直接的影响.

Study on Temperature Character of Stimulated Raman Scattering Spectrum in Silica Fiber

Stimulated Raman scattering(SRS)spectrum of silica fiber was studied under different temperatures.The influence of temperature on feature of SRS spectra was analyzed theoretically and experimentally.The laws of how the Raman frequency-shift,bandwidth and intensity of the first order Stokes light change with the temperature were obtained using a pulsed Q-switched doubled frequency laser.The experiments indicate that the frequency-shift becomes bigger with the increasing the temperature.Raman frequency-shift has a linear relationship with the temperature.Under the same pump power,when the temperature is lower,the order of SRS spectrum is lower.Lower temperature has high order Stokes light.For higher order Stokes lights,the lower the temperature,the higher the threshold.But the changes in spectrum bandwidth show no linear relationship with the temperature,and there is a maximum of bandwidth.Theory and experiments indicate that temperature has direct effect on the SRS of fiber.