温度对染料掺杂胆甾相液晶激光波长的影响及应用  

Effect of Temperature on Laser Wavelength of Dye-Doped Cholesteric Liquid Crystal and Its Applications in Temperature Sensor

作　　者：叶丽慧 黄玉华[1] 罗吉祥[1] 

机构地区：[1]浙江师范大学信息光学研究所浙江省光信息检测与显示技术研究重点实验室,浙江金华321004

出　　处：《中国激光》2016年第1期130-135,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61275141)

摘　　要：研究了温度对激光染料掺杂胆甾相液晶的激光波长的影响,发现胆甾相液晶输出的激光波长总体上随温度的升高而红移,但是不同厚度的样品随温度变化的趋势略有不同。样品较薄时,激光波长随温度变化呈周期性的跳变式增长,而在相邻两个跳变温度之间的一小段温度范围内则随温度的升高而蓝移,且激光波长随温度变化产生突变的周期随样品厚度增加而减小。当样品厚度足够大时,激光波长随温度变化产生的突变消失,几乎随温度呈线性增长。分析了产生该现象的物理机制,并对其进行了理论模拟。模拟结果与实验结果一致。厚的染料掺杂胆甾相液晶样品产生的激光波长随温度线性变化的这一特性,可以用于温度传感。The effect of temperature on laser wavelength from a dye-doped cholesteric liquid crystal （CLC） is studied. It is found that the laser wavelength is red shifted with the temperature rise. For a thin dye-doped CLC sample, the laser wavelength abruptly jumps at a certain temperature and then slightly decreases with the temperature rise within a certain temperature range. When the sample is thick enough, i.e. the sample thickness is more than 25 μm, the laser wavelength almost increases linearly with the temperature rise. The physical mechanism of this phenomenon is analyzed, theoretical simulation is performed, and the simulation result is consistent with the experimental result. The property that the laser wavelength increases linearly with the temperature rise can be used for temperature sensors.

关 键 词：材料 胆甾相液晶 液晶激光 温度传感器 波长 厚度 

分 类 号：O43[机械工程—光学工程]