影响棱镜角度精度的几个因素及解决方法

由于在棱镜制造过程中的每一道工序都有可能影响角度精度 ,所以对角度精度的控制始终贯穿于整个制造过程。讨论了在制造过程中的五个主要因素对角度精度的影响 ,并给出了解决方法     

Relationship between Timing Jitter and Prism Separation in Mode-locked Solid State Lasers

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Dm—99数字折光仪

简要介绍Dm-99数字折光仪的工作原理、仪器组成、主要部件设计和它的特点。     

Electronic Structure and Photophysical Properties of 2-(N,N-diethylanilin-4-yl)-4,6-bis(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine

Electronic structure and photophysical properties of 2-(N,N-diethylanilin-4-yl)-4,6-bis(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine are studied theoretically with quantum chemical methods as well as 2D site and 3D cube representations. The theoretical results reveal that the first excited state is an intramolecular charge transfer excited state. The change in dipole moment for the first excited state of the excitation is fitted, and the calculated result the change in dipole moment ￠1=6.40 D is consistent with the experimental result ￠1=6.90 D. The polarizability is also fitted. The large changes in dipole moment and the polarizability of the excitation show that S1 is of large nonlinear optical (NLO) effect. The NLO will promote efficient two-photon-absorption cross sections. The excited state properties of dpbt with different external electronic fields are also discussed theoretically.     

锥体棱镜的加工与检验

锥体棱镜是一种重要的逆向反射器 ,它广泛应用于远距离测距等方面。同时也是一种精度高、加工难度大的光学元件。介绍了锥体棱镜的两种加工工艺及其特点 ;着重叙述了立方体切角的方法 ,即借助于 T型抛光定位夹具和切角定位夹具加工锥体棱镜的工艺过程。同时给出了当用干涉法测量锥体棱镜时 ,干涉图的判别原则和棱镜合格时干涉图的特点。该方法对综合角度误差≤ 3″的锥体棱镜来说可获得很高的合格率。     

微正方形角锥棱镜定向反射特性

对微正方形角锥棱镜阵列定向反射器的特性进行了理论研究和模拟。证明了其定向反射特性 ,并利用几何光学方法解决了全反射条件对入射孔径角的限制 ,以及单元有效反射面积对定向反射率的影响问题 ,同时也给出了阵列器件表面反射对定向反射率的影响。为了便于比较 ,也给出了微三角形角锥棱镜阵列定向反射器的单元反射面积。所得结果为微正方形角锥棱镜阵列定向反射器的制作提供了理论依据。     

棱镜晶体旋转法测量液晶器件大预倾角

晶体旋转法是测量液晶分子预倾角的常用方法,但不适用于测量20°~70°之间的预倾角。提出一种棱镜辅助晶体旋转法测量预倾角的方案。把液晶盒夹在两个直角棱镜间,入射光从前面棱镜一个面入射,经过液晶盒从后面棱镜出射,改变入射光的入射角,测量出射光透过率,能得到对应双折射相位差为零、透射光强最大的入射角,进而由几何光学关系确定预倾角。数值模拟和实验结果显示该方法具有可行性。     

角锥棱镜腔Nd:YAG/Cr4+:YAG被动锁模激光器的研究

理论分析并数值模拟了腔内光强随角锥棱镜旋转的变化,实验证明在角锥棱镜腔Nd:YAG/Cr4 :YAG被动锁模激光器中,偏振耦合输出得到了锁模深度和锁模几率近乎100%的线偏振被动锁模脉冲输出.通过旋转角锥棱镜改变偏振耦合输出、调节腔内光强,可以得到被动锁模和被动调Q两种状态的脉冲输出,脉冲能量166.5 mJ/pulse,脉冲动静比高达59.7%.     

Investigation of Two Zr-p-NO2Bn-DOTA Isomers via NMR and Quantum Chemical Studies

A combination of NMR studies and quantum chemical calculations were employed to investigate the structure and energetics of Zr⁴⁺ chelates of pNO₂Bn-DOTA. We have demonstrated that two discrete regioisomeric chelates are generated during the complex formation. The nitrobenzyl substituent can adopt either an equatorial corner or side position on the macrocyclic ring. These regioisomers are incapable of interconversion and were isolated by HPLC. The corner isomer is more stable than the side, and the SAP conformer of both regioisomers is energetically more favorable than the corresponding TSAP conformer.