Internal Optical Parametric Oscillator with SBS Phase Conjugate Resonator

It is reported a novel optical parametric oscillator with KTP as medium crystal inside a Nd∶YAG phase conjugate resonator. In the phase conjugate resonator, the laser beam quality is promoted by phase-conjugate mirror, which is realized by stimulated Brillouin scattering effect, and Q-switch is generated simultaneously. With this device, the laser output at 1.57 μm with 15 mJ energy and 8 ns pulse width is obtained.     

受激布里渊散射相位共轭光泵浦的高效率光学参量振荡器

报道了在Ｎｄ：ＹＡＧ１．０６μｍ激光器上，用受激布里渊散射（ＳＢＳ）后向放大输出作泵浦光源，用光学参量振荡（ＯＰＯ）的方法，获得１．５７μｍ激光输出，最大输出能量为２１．６ｍＪ，相应的转换效率为３２％，并与直接用Ｎｄ：ＹＡＧ１．０６μｍ激光泵浦结果相比较，效率提高１．９倍，阈值降低１．７倍，实验结果与理论分析符合的较好。     

SBS作相位共轭谐振腔的研究

用受激布里渊散射（SBS）作为相位共轭腔，同时兼起调Q脉冲压缩作用，得出了在不同聚焦参量下脉宽压缩的结果。     

GPC－FTIR联用测定共聚物SBS的结构分布

凝胶渗透色谱仪（ＧＰＣ）与傅里叶变换红外光谱仪（ＦＴＩＲ）联用，以ＣＳ２为流动相，获得了共聚物ＳＢＳ的ＧＰＣ馏分的红外光谱图。根据图上各分离时间切片的红外光谱数据，计算出各相应时间切片的化学结构组成。结合经普适校正法获得的ＳＢＳ分子量分布的结果，采用自己编程的ＧＰＣ－ＦＴＩＲ－ＳＢＳ软件对ＳＢＳ的结构随分子量的变化进行了测定，得到了ＳＢＳ化学结构－分子量的分布图。     

S-band multiwavelength Brillouin Raman Fiber Laser

In this paper we propose and demonstrate an S-band Brillouin-Raman Fiber Laser (BRFL). The S-band BRFL utilizes a Dispersion Compensating Fiber (DCF) as the non-linear gain medium in a linear cavity configuration and amplified by two 1425 nm, 380 mW pumped Raman Fiber Amplifiers (RFAs). A Brillouin Pump (BP) signal of 1515 nm at 12 dBm in power is injected into the setup to generate Stokes lines via the Stimulated Brillouin Scattering (SBS) process. The S-band BRFL is able of generating a Brillouin comb with 32 Stokes lines with a flat peak output power of − 18 dBm. The best BP to Stokes power ratio of the system is determined to be 50:50, while a ratio of 70:30 is observed to generate Stokes with a higher peak power, but at the expense of the number of wavelengths. The S-band BRFL has many potential applications as multiwavelength sources for communications and sensors.     

反射光中Stokes成分对受激布里渊散射过程的影响

区别于传统的受激布里渊散射(SBS)发生器和放大器，提出了一种新型的SBS模型：自供种子光模型(self stokes seeding,SSS). 通过对抽运光波形函数的傅里叶变换得到了Stokes成分在抽运光中所占的比例，即Stokes能量比. 考虑SSS效应，数值求解了SSS耦合波方程组，得到了SBS反射率的时间演变形式，理论研究发现，当抽运光正入射到平板样品上时，反射光中的Stokes成分极大地促进了SBS起振过程，其结果相当于反向注入一定强度的种子光，而Stokes能量比的大小决定了SBS过程起振 关键词： 光学材料 受激布里渊散射 傅里叶分析 斯托克斯种子光     

Selective swelling blends of block copolymers for nanoporous membranes with enhanced permeability and robustness

Block copolymers (BCPs) are important precursors to produce membranes with well‐defined porosities. However, it remains challenging to prepare robust and affordable BCP‐based membranes. In this work, cheap commodity styrene‐butadiene‐styrene (SBS) elastic triblock copolymers are mixed with polystyrene‐block‐poly (2‐vinylpyridine) (SV) block copolymers in solutions, leading to macroscopically stable blend films upon casting because of the compatibilizer effect of PS existing in both copolymers. By soaking the blend films in ethanol, the microdomains of poly(2‐vinylpyridine) are selectively swollen and cavitated upon drying, resulting in a hierarchical structure with perforated SV phases interwoven with the SBS phases. The blend membranes with 30% SBS exhibit improved water permeability and mechanical robustness due to the presence of elastic SBS compared to neat SV membranes; meanwhile, the rejections of the blend membranes remain largely unchanged. Moreover, the blend membranes exhibit a pH‐responsive function, and homoporous SV regions are obtained by pre‐aligning the SV phases. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 , 55, 1617–1625     

SBS方程有界解的研究

对于SBS方程(双稳态方程) , 当参数 时, 若该方程的1个解在 上有界, 且在该范围内, 定号, 那么此解有1个无限数量的极值. 文中仅对参数 的范围进行了改变, 将SBS方程解的极值控制在了3个常数上, 由此得到了一个更精确的结论, 并同时给出相应的证明.     

SBS作相位共轭谐振腔产生Q突变的研究

用受激布里渊散射(SBS)作为相位共轭腔,同时兼起调Q脉冲压缩作用。并给出了在不同聚焦参数下脉宽压缩的结果。     

利用受激布里渊散射实现在轨运动目标激光跟踪瞄准研究

利用受激布里渊散射相位共轭技术,补偿激光大气传输过程中由于大气湍流等因素所造成的激光波前畸变,并且引入速度补偿镜方法,对模拟运动目标进行激光跟踪瞄准。利用高斯光束的无限腔长相位共轭腔理论分析了这种跟瞄方法的可行性。在室外1．27km距离,进行了在轨运动目标跟踪瞄准的原理性实验研究,实验结果表明,利用受激布里渊散射相位共轭技术和速度补偿镜方法,可以实现对在轨运动目标的跟踪瞄准,并且通过此方法,可以把激光能量能较好地集中于目标上一个很小的区域内。到达目标的最大共轭光能量为24．0mJ。