基于全息液晶／聚合物光栅的分布反馈式激光器的波长调谐特性研究

摘要

首先制备了不同周期的染料掺杂全息液晶／聚合物光栅并进行激光抽运实验，得到了激光器的调谐曲线，确定了激光器在574nm到685nm的谱带里均可以实现激光输出，即激光器具有110nm左右的可调谐范围．之后，通过温控仪控制样品的温度，对周期为610nm的染料掺杂全息液晶／聚合物光栅进行激光抽运，探测不同温度下的输出激光光谱，观察到随着温度由20°C升高到65°C，激光器的中心波长由627．9nm减小到623nm，产生了4．9nm的波长蓝移．%In this paper, we study the wavelength tunable properties for distributed-feedback lasing from 4-（dicyanomethylene）-2-methyl-6（4-dimethylaminostyryl）-4H-pyran （DCM） dye-doped holographic polymer dispersed liquid crystal grating. By preparing and pumping the DCM-doped HPDLC gratings with various grating spacings, we depict the tuning curve of the distributed-feedback lasing and confirm that only in a range from 574 nm to 685 nm, the lasing action can be observed. Then, we adjust the temperature of the sample and measure the lasing spectrum from the DCM-doped holographic polymer dispersed liquid crystal grating with a grating period of 610rim. There is an obvious 4.9 nm blueshift from 627.9 nm to 623 nm for the lasing wavelength with the temperature increasing from 20 °C to 65 °C.