光子选通光谱烧孔的全息检测与图像存贮

报道在有机光子选通光谱烧孔材料苯基四苯并卟啉锌/芳晴系统中，进行全息光谱烧孔和图像存贮的实验结果．实验表明全息烧孔极大地提高了光谱孔的检测灵敏度和信噪比．通过全息光子选通光谱烧孔，成功地进行了光子选通型的频率选择的多幅全息图存贮，得到清晰的图像再现 关键词：     

持久光谱烧孔动力学的理论模型和实验研究

建立了单光子光化烧孔的三能级模型，求解了反映质子转位变构机制的速率方程组，推导了成孔过程的动力学特性，获得了可与实验进行比较的解析解．用时域和频域两种方法测量了ＴＨＰ／ＰＭＭＡ和ＴＭＰ／ＰＭＭＡ薄膜样品光谱烧孔的动力学过程，得到与理论分析一致的规律，并测得了有效成孔速率和成孔时间等参数．这些参数对于评价频域光存贮材料性能有一定意义．     

球形微粒样品室温永久光谱烧孔的动力学过程及多重性研究

利用球粒表面形态共振，实现室温下的永久光谱烧孔，建立理论模型对动力学过程进行分析，据此对实验结果进行拟合，得到有效成孔速率等参数；并对烧孔的多重性进行研究，将这些结果应用于室温频域光信息存贮将有较好的前景。     

光谱烧孔技术

论述了光谱烧孔技术的动力学理论模型 ;介绍了单光子烧孔和多光子烧孔所取得的实验结果 ;讨论了光谱烧孔的发展趋势 :提高烧孔度 ,实现室温烧孔和提高探测及读出时的信噪比。问题的关键在于光致填孔机制的研究。同时提出将它投入实际应用亟待解决的问题 ,即作为一种可能的高密度频域光信息存储手段所亟待解决的问题是开发适应于此技术的新材料 ,深入研究材料体系的烧扎特性     

依赖于激光线宽的信息写入效率的研究

本工作研究了在聚苯乙烯八乙基卟啉永久性光谱烧孔材料上进行光谱相位编码时域光全息读写中信息写入效率随激光谱带变宽而降低的现象,建立了分子转动引起光谱再分布模型,并计算了不同写入激光线宽下信号衍射效率随曝光量的变化规律,很好地符合了实验结果.     

双强度调制偏振光谱测量原理及仿真

针对单强度调制偏振光谱测量技术存在混叠且有效光程差有限的缺点,提出双强度调制偏振光谱测量新方法,该方法通过双强度调制干涉信号的和差处理,即保证单强度调制偏振光谱测量的优点,又能有效消除混叠现象,提高有效光程差和光谱分辨率,再对和差处理后的干涉信号进行傅里叶变换即可得到被测偏振光谱。文章对双强度调制偏振光谱测量方法进行了理论推导,并通过MATLAB对模拟入射光偏振光谱的干涉信号和傅里叶反演光谱进行仿真;仿真结果显示,该方法和差处理后可有效消除混叠且有效光程差提高一倍。通过理论分析和仿真验证了该方法的可行性,为进一步的工程实现提供理论支撑。     

全息光栅光谱烧孔系统和材料特性的研究

建立了全息光栅光谱烧孔技术中，系统的存储密度，读出信噪比和材料特性，读写条件关系的数理模型，计算机模拟定量分析得到了最佳材料特参量空间。研究表明，全息光栅光谱烧孔技术可放宽系统对材料特性的要求，将为烧孔材料研究提供新的理论依据。     

室温下的永久性光谱烧孔

本文首次报导了Sm2+掺杂的碱土金属氟卤化物在室温下的光谱烧孔.室温下永久性光谱烧孔的实现,将对频域光存储的应用起到推动作用.     

二价钐离子谱线的非均匀加宽、荧光窄化和永久性光谱烧孔

基于光谱烧孔在高密度光存储中的可能应用,研究了谱线非均匀加宽、荧光谱线窄化、高温永久性光谱烧孔、烧孔机理、烧孔动力学过程和光谱孔的热稳定性。在国际上率先设计并研制出二价钐离子掺杂碱土金属氟卤化物混晶高温光谱烧孔体系,实现了室温永久性光谱烧孔,获得了室温寿命300h的光谱孔。利用时间分辨光谱分离出非均匀线形内的各局域组态,比较烧孔前后光谱再分布证实了三价钐离子的电子陷阱作用。利用Block理论分析了烧孔动力学过程。     

频域干涉及调制光谱的可能性

研究光场频域干涉和谱相关引起的光谱密度变化，探讨通过对光谱调制来构造光谱的可能性．给出一个压窄谱宽的例子并进行了数值计算，发现频域干涉的方法能够在谱宽变窄的同时利用较多的光能量，其可利用的光能量的比例比滤波片要大得多     

Switchable Multi-Wavelength Erbium-Doped Fiber Lasers based on a Mach-Zehnder Interferometer Using a Twin-Core Fiber

A switchable multi-wavelength erbium-doped fiber ring laser based on a compact in-fiber Mach-Zehnder interferometer comb filter at room temperature is presented. The comb filter is formed by splicing a section of twin-core fiber between two single mode fibers. By adjusting the states of the polarization controller appropriately, the laser can be made to operate in stable single-, dual- and three-wavelength lasing states. The operation principle is based on spectral hole burning induced by the saturated effect and polarization hole burning.     

Switchable multi-wavelength fiber ring laser using a side-leakage photonic crystal fiber based filter

A switchable multi-wavelength fiber ring laser is proposed and experimentally demonstrated with a novel side-leakage photonic crystal fiber (SLPCF) based filter incorporated into the ring cavity at room temperature. Stable multi-wavelength laser operations can be achieved due to the spatial mode beating, polarization hole burning and spectral hole burning effects. By adjusting the polarization controller appropriately, the laser can be switched among the single-, dual- and triple-wavelength lasing oscillations whose signal-to-noise ratio is up to 50 dB. In addition, the lasing wavelength can be also tuned and switched by applying the strain to the filter.     

光谱烧孔中孔的宽度和深度与烧孔光持续时间的关系

本文由光学Bloch方程出发,讨论了二能级系统光谱烧孔中孔宽和孔深与烧孔激光脉冲持续时间的关系.在强场下短脉冲烧孔中,用π脉冲可以得到足够深且宽度小于稳态值的孔.弱场下,孔深与烧孔时间成指数关系.Bloch方程的修正对上述两种条件下烧孔行为的描述无明显影响.以二能级系统光谱烧孔为基础,讨论了永久性光谱烧孔和光子选通光谱烧孔中孔的行为.     

High frequency wavelength modulation spectroscopy with diode lasers

High frequency wavelength modulation spectroscopy with diode lasers is accomplished by dithering the drive current at RF frequencies as high as 250 MHz. This technique is useful for fast and sensitive detection of absorption lines in the near-and mid-infrared spectral regions. Detection of 300 MHz wide spectral features corresponding to 1% changes in transmission is accomplished in time intervals as short as 500 ns. A potential application is for fast reading of information contained in frequency domain optical memories based upon photochemical hole burning.     

无机材料BaFCl0.5Br0.5：Sm^2＋光子选通光谱烧孔

本文报道了无机材料的BaFCl_(0.5)Br_(0.5):Sm~(2+)的光子选通光谱烧孔.文中叙述了光子选通光谱烧孔的机制.在低温4.2K下进行多孔烧孔和探测.测量了孔的选通性和稳定性.实现了孔的可擦除和重复烧孔.测量结果表明,处于4.2K的BaFCl_(0.5)Br_(0.5):Sm~(2+)样品,在一个非均匀加宽轮廓内可实现1×10~3个以上数目的永久性光谱烧孔.     

Fluorescence-excitation and hole-burning spectroscopy of heavy-dose neutron-irradiated α-Al2O3

We report on persistent spectral hole-burning and fluorescence-excitation spectroscopy in heavy-dose (3 × 10²⁰ n/cm²) neutron-irradiated and annealed sapphire using a Ti:Sapphire ring laser in single-frequency and broad-band operation. The optimum conditions for hole burning were obtained after annealing the crystals to 400 °C. Holes have been detected in the near-infrared spectral range between 745 and 795 nm. At 1.5 K, the narrowest hole widths were approximately 2 GHz, so that about 10⁴ holes can be burnt in this spectral region. Besides the storage density in the wavelength dimension, the coefficient describing the electric-field-induced filling of a spectral hole also rises by more than one order of magnitude as compared to crystals with low neutron-irradiation dose.     

频域中固体多重光谱烧孔研究

报道固体选通光谱多重光谱烧孔研究的新进展，分析影响多生烧孔形成的一些主要因素，首次报道了在有机材料ＺｎｔｂＰ／ＣＡ／ＰｈＲ的非均匀加宽线内获得一次连续烧出１００多光谱孔的结果，还进一步报道用穿带激光获得更窄线宽的光谱烧孔的情况。     

Three comments on single impurity-molecule spectroscopy

Three issues of interest in the present stage of development of single impurity-molecule spectroscopy (SIMS) are discussed: (i) prospects of SIMS in quantum informatics, (ii) the possibility of SIMS realization by measuring the surface enhanced Raman scattering in solids, and (iii) concentration effects in SIMS and in persistent spectral hole burning.