染料掺杂液晶激光器的光谱特性研究

Study on the Spectrum Characteristics of Dye Doped Liquid Crystal Laser

首先从理论上计算出了染料(DCM)掺杂液晶激光器的泵浦阈值能量为9.2×10-7 J,从而选定了最适合的泵浦光源,并在此基础上设计了相应的泵浦光路。通过检测输出激光的光强和波长,从光栅周期、外加电场两个方面着手对激光器的输出光谱进行了特性研究,结果表明,通过改变光栅周期就可以实现出射激光波长在100nm范围内(585~685nm)的调谐,符合理论计算值。与此同时,通过施加外加电场也可以实现出射波长的调谐,虽然调谐范围较小,但是也实现了输出激光强度的调谐,强度调谐幅度高达90.2%。染料掺杂液晶激光器的波长和光强双向可调谐特性,大大拓展了其在全光网络通信的应用前景。但是,当电场从0V·μm^(-1)增加到20V·μm^(-1)时,出射激光的线宽也从0.4nm增加到了1.5nm,在激光器的可调谐应用中也应注意线宽的变化。

In this paper,the energy of pump threshold value of DCM doped liquid crystal laser is theoretically calculated(9.2×10-7 J).In addition,the most suitablepump light source are selected,and the corresponding pump experiment is designed.The characteristics of the laser are studied through detecting the light intensity and wavelength of the output laser.The results show that the laser wavelength can be tuned in the range of 100 nm(585~685 nm)by changing the grating period which accords with the theoretical calculation.In the meanwhile,the laser wavelength can be tuned by applying the applied electric field.What’s more,the output laser strength can also be switchable,and the intensity switchable abilitycan reach 90.2%.The application prospect of dye doped liquid crystal laser in the all optical network communication field is greatly expanded because of theswitchable ability.However,when the electric field increases from 0 to 20V·μm-1,the line width of the laser is increased from 0.4 to 1.5 nm.The change of line width should be noted in the tunable application of dye doped laser.