染料掺杂手性向列相液晶器件中实现随机激光辐射
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摘要
设计制作了染料掺杂手性向列相液晶器件,研究了其随机激光辐射行为。均匀混合激光染料DCM和PM597、手性剂S-811、向列相液晶TEB30A,注入无摩擦取向的40μm液晶盒,制成焦锥织构态的手性向列相液晶激光器件。采用固体Nd:YAG倍频532nm波长的脉冲激光作为抽运光泵浦样品。掺杂激光染料PM597和DCM的液晶器件分别在575～588nm和600～620nm范围显示了尖锐、分立的随机激光辐射峰,线宽约为0.3nm。探测了器件在不同方向上的激光辐射谱,在与样品表面夹角约为45°～150°的范围内均能探测到随机激光。在器件中,手性向列相液晶焦锥织构态对光的强散射作用是随机激光产生的主要原因。
A device of dye-doped chiral-nematic liquid crystal laser is prepared,and the random laser mechanism is analyzed.A focal conic state is achieved after mixing laser dyes DCM and PM597.Chiral compound S-811 and nematic liquid crystal TEB30 Aare infused into 40μm cells with no rubbing treatment,respectively.A Nd∶YAG pulsed solid-state laser with a wavelength of 532 nm is used as pump source.Both cells emit a discrete and sharp random laser with a line-width of 0.3 nm.The laser from the PM597 doped cell has a wavelength region of 575～588 nm,and the laser from the DCM doped cell has a wavelength region of 600～620 nm.The random laser can be detected in a fanshaped region with an angle from 45° to 150° to the cell surface.In the device,the strong scattering of chiral conical texture of liquid crystal in chiral nematic liquid crystal is the main reason of random lasing.
A device of dye-doped chiral-nematic liquid crystal laser is prepared,and the random laser mechanism is analyzed.A focal conic state is achieved after mixing laser dyes DCM and PM597.Chiral compound S-811 and nematic liquid crystal TEB30 Aare infused into 40μm cells with no rubbing treatment,respectively.A Nd∶YAG pulsed solid-state laser with a wavelength of 532 nm is used as pump source.Both cells emit a discrete and sharp random laser with a line-width of 0.3 nm.The laser from the PM597 doped cell has a wavelength region of 575～588 nm,and the laser from the DCM doped cell has a wavelength region of 600～620 nm.The random laser can be detected in a fanshaped region with an angle from 45° to 150° to the cell surface.In the device,the strong scattering of chiral conical texture of liquid crystal in chiral nematic liquid crystal is the main reason of random lasing.
引文
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[3]贺锋涛,贾琼瑶,孙林军.液晶激光投影显示系统设计[J].红外与激光工程,2012,41(10):2699-2702.HE F T,JIA Q Y,SUN L J.Design of liquid crystal laser projection display system[J].Infrared and Laser Engineering,2012,41(10):2699-2702.(in Chinese)
[4]岱钦,邬小娇,吴杰,等.染料掺杂手性向列相液晶激光器的制备和研究[J].液晶与显示,2014,29(6):922-925.DAI Q,WU X J,WU J,et al.Preparation and research of dye-doped chiral nematic liquid crystal[J].Chinese Journal of Liquid Crystals and Displays,2014,29(6):922-925.(in Chinese)
[5]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].Chinese Journal of Liquid Crystals and Displays,2013,28(5):679-682.(in Chinese)
[6]姜宝光,曹召良,穆全全,等.激光为光源的液晶自适应眼底成像系统[J].光学精密工程,2008,16(10):1805-1809.JIANG B G,CAO Z L,MU Q Q,et al.Liquid crystal based retina adaptive optical imaging system with laser source[J].Optics and Precision Engineering,2008,16(10):1805-1809.(in Chinese)
[7]岱钦,乌日娜,杨健,等.电场作用下染料掺杂液晶器件的激光辐射[J].光学精密工程,2011,19(7):1510-1514.DAI Q,WU R N,YANG J,et al.Laser emission of dye-doped liquid crystal devices under applying voltage[J].Optics and Precision Engineering,2011,19(7):1510-1514.(in Chinese)
[8]GOLDBERG L S,SCHNUR J M.Tunable internal-feedback liquid crystal-dye laser:US,3771065[P].1973-11-06.
[9]MORRIS S M,GARDINER D J,HANDS P J W,et al.Electrically switchable random to photonic band-edge laser emission in chiral nematic liquid crystals[J].Applied Physics Letters,2012,100(7):071110.
[10]CHEN C W,HUANG H P,JAU H C,et al.Polarization-asymmetric bidirectional random laser emission from a twisted nematic liquid crystal[J].Journal of Applied Physics,2017,121(3):033102.
[11]LI L W,DENG L G.Random lasing from dye-doped chiral nematic liquid crystals in oriented and non-oriented cells[J].European Physical Journal B,2013,86(3):112.
[12]CAO H,ZHAO Y G,HO S T,et al.Random laser action in semiconductor powder[J].Physical Review Letters,1999,82(11):2278-2281.
[13]FERJANI S,BARNA V,DE LUCA A,et al.Thermal behavior of random lasing in dye doped nematic liquid crystals[J].Applied Physics Letters,2006,89(12):121109.