SU-8光栅结构中的液晶激光特性

乌日娜; 卢佳琦; 杨帆; 张楠; 郭宋明; 岱钦

doi:doi:10.3788/fgxb20204101.0071

发光学报, 2020, 41 (1): 71, 网络出版: 2020-02-24

SU-8光栅结构中的液晶激光特性

Features of Liquid Crystal Laser in SU-8 Grating Structure

论文大纲

乌日娜 ^*卢佳琦杨帆张楠郭宋明岱钦

作者单位

沈阳理工大学理学院, 辽宁沈阳 110159

手性向列相液晶 SU-8光栅随机激光 chiral nematic liquid crystal SU-8 grating random laser

摘要

设计制作了SU-8光栅结构的染料掺杂手性向列相液晶激光器件, 在器件正面和侧面均实现了随机激光辐射。将激光染料PM597、手性剂S-811、向列性液晶TEB30A按一定比例均匀混合, 注入反平行摩擦处理的液晶盒中, 器件的下基板通过光掩模法刻蚀出周期为15 μm的光栅。利用532 nm的Nd∶YAG固体脉冲激光器作为泵浦源, 器件的侧面既在580~590 nm范围内出现了多个离散分立的随机激光辐射峰, FWHM约0.19 nm, 又在579~585 nm范围内出现独立的两个激光辐射峰, FWHM约0.19 nm; 在器件正面获得了584~590 nm范围的随机激光辐射谱, FWHM约0.17 nm。加热器件至61 ℃, 液晶相变为各向同性态, 器件侧面仍出现了波长约590.60 nm、FWHM约0.24 nm的激光辐射峰。分析得出, 液晶盒中引入SU-8光栅结构后, 光子同时在液晶分子间多重散射和SU-8光栅中布拉格反射获得反馈放大, 两种机制相辅相成。器件侧面出现的独立激光辐射峰主要由SU-8光栅布拉格反射提供反馈放大形成, 而器件侧面和正面的随机激光辐射峰主要由液晶分子间多重散射提供反馈放大形成。

Abstract

The dye-doped chiral nematic liquid crystal (DDCLC) laser with the SU-8 grating structure is designed and fabricated. Random laser emission is realized on both front and side of the device. After an SU-8 grating with a period of 15 μm is produced on the bottom glass substrate of an anti-parallel rubbing treatment cell by the lithography technique, uniformly mixed laser dye PM597, chiral compound S-811 and nematic liquid crystal (LC) TEB30A are infused into the cell. When the cell is pumped by a 532 nm Nd∶YAG pulsed solid-state laser, a series of discrete random lasers with a full width at half maximum (FWHM) of 0.19 nm and a range of 580-590 nm, and two independent lasers with an FWHM of 0.19 nm and a range of 579-585 nm are excited at the side of the cell. In addition, a random lasing emission with an FWHM of 0.17 nm and a range of 584-592 nm is generated on the front of the cell. If the cell is heated to 61 ℃ in which the LC phase changes into an isotropic state, the laser emission with a wavelength of about 590.60 nm and FWHM of about 0.24 nm is still observed on the sideof the device. The experimental results show that after the SU-8 grating structure is introduced into the liquid crystal cell, photons can obtain feedback amplification not only through multiple scattering between liquid crystal molecules but also via Bragg reflection in the SU-8 grating. These two mechanisms can complement each other. The independent laser emissions on the side of the cell are mainly produced by Bragg reflection of the SU-8 grating. Whereas, the random lasers on the side and front of the cell are formed through multiple scattering between liquid crystal molecules.

参考文献

[1] GOLDBERG L S,SCHNUR J M. Tunable internal-feedback liquid crystal-dye laser:USA,3771065 ［P］. 1973-11-06.

[2] FINKELMANN H,KIM S T,PALFFY-MUHORAY A M P,et al.. Tunable mirrorless lasing in cholesteric liquid crystalline elastomers ［J］. Adv. Mater., 2001,13(14):1069-1072.

[3] CHANISHVILI A,CHILAYA G,PETRIASHVILI G,et al.. Phototunable lasing in dye-doped cholesteric liquid crystals ［J］. Appl. Phys. Lett., 2003,83(26):5353-5355.

[4] HUANG Y H,ZHOU Y,WU S T. Spatially tunable laser emission in dye-doped photonic liquid crystals ［J］. Appl. Phys. Lett., 2006,88(1):011107-1-3.

[5] JEONG M Y,CHA J H. First hand in situ observation of active fine laser tuning by combining a temperature gradient and a CLC wedge cell structure ［J］. Opt. Express, 2015,23(16):21243-21253.

[6] INOUE Y,MATSUHISA Y,YOSHIDA H,et al.. Electric field dependence of lasing wavelength in cholesteric liquid crystal with an in-plane helix alignment ［J］. Mol. Cryst. Liq. Cryst., 2010,516(1):182-189.

[7] KOPP V I,FAN B,VITHANA H K M,et al.. Low-threshold lasing at the edge of a photonic stop band in cholesteric liquid crystals ［J］. Opt. Lett., 1998,23(21):1707-1709.

[8] 岱钦,李漫,王兴,等. 梳状电极胆甾相液晶激光器的激光辐射谱［J］. 发光学报, 2018,39(9):1305-1309.

DAI Q,LI M,WANG X,et al.. Lasing spectrum of cholesteric liquid crystal with interdigitated electrodes pattern ［J］. Chin. J. Lumin., 2018,39(9):1305-1309. (in Chinese)

[9] 张伶莉,孙秀冬,刘永军,等. 具有外部谐振腔的胆甾相液晶激光器的研究［J］. 液晶与显示, 2013,28(5):679-682.

ZHANG L L,SUN X D,LIU Y J,et al.. Cholesteric liquid crystals laser with external cavity ［J］. Chin. J. Liq. Cryst. Disp., 2013,28(5):679-682. (in Chinese)

[10] 袁丛龙. 外场操控手性液晶自组装微纳结构与光子学应用［D］. 上海:华东理工大学, 2018.

YUAN C L. Controllable Chiral Liquid Crystal Self-organized Micro/Nanostructure and Photonic Applications ［D］. Shanghai:East China University of Science and Technology, 2018. (in Chinese)

[11] BLINOV L M. Lasers on cholesteric liquid crystals:mode density and lasing threshold ［J］. JETP Lett., 2009,90(3):166-171.

[12] 刘永军,王斐儒,孙伟民,等. 胆甾相液晶激光器的调谐特性研究［J］. 物理学报, 2013,62(7):076101-1-5.

LIU Y J,WANG F R,SUN W M,et al.. Tunable capability of dye-doped cholesteric liquid crystal lasers ［J］. Acta Phys. Sinica, 2013,62(7):076101-1-5. (in Chinese)

[13] BLINOV L M,LAZAREV V V,PALTO S P,et al.. Electric field tuning a spectrum of nematic liquid crystal lasing with the use of a periodic shadow mask ［J］. J. Nonlinear Opt. Phys. Mater., 2007,16(1):75-90.

[14] 邓舒鹏,李文萃,黄文彬,等. 基于透射式液晶/聚合物光栅的分布反馈式激光器的研究［J］. 物理学报, 2011,60(5):056102-1-6.

DENG S P,LI W C,HUANG W B,et al.. Distributed-feedback lasing from dye-doped holographic polymer dispersed liquid crystal transmission grating ［J］. Acta Phys. Sinica, 2011,60(5):056102-1-6. (in Chinese)

[15] 刘明欢,李大禹,姚丽双,等. 基于液晶/聚合物光栅选频的高效率有机半导体激光器［J］. 液晶与显示, 2017,32(11):853-860.

LIU M H,LI D Y,YAO L S,et al.. High efficiency organic semiconductor laser using a liquid crystal/polymer grating as an oscillation cavity ［J］. Chin. J. Liq. Cryst. Disp., 2017,32(11):853-860. (in Chinese)

[16] 刘明欢. 高转化效率液晶/聚合物光栅激光器的制备研究［D］. 长春:中国科学院长春光学精密机械与物理研究所, 2018.

LIU M H. The Research of Fabricating a High Conversion Efficiency Liquid Crystal/Polymer Grating Laser ［D］. Changchun:Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences, 2018. (in Chinese)

[17] 乌日娜,王兴,杨帆,等. 染料掺杂手性向列相液晶器件中实现随机激光辐射［J］. 液晶与显示, 2018,33(6):464-468.

WU R N,WANG X,YANG F,et al.. Realization of random lasing in dye-doped chiral nematic liquid crystal ［J］. Chin. J. Liq. Cryst. Disp., 2018,33(6):464-468. (in Chinese)

[18] 高鸿锦. 液晶化学［M］. 北京:清华大学出版社, 2011.

GAO H J. Liquid Crystal Chemistry ［M］. Beijing:Tsinghua University Press, 2011. (in Chinese)

乌日娜, 卢佳琦, 杨帆, 张楠, 郭宋明, 岱钦. SU-8光栅结构中的液晶激光特性[J]. 发光学报, 2020, 41(1): 71. WU Ri-na, LU Jia-qi, YANG Fan, ZHANG Nan, GUO Song-ming, DAI Qin. Features of Liquid Crystal Laser in SU-8 Grating Structure[J]. Chinese Journal of Luminescence, 2020, 41(1): 71.

SU-8光栅结构中的液晶激光特性

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