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。     

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。     

混合卟啉体系中的光化学烧孔

在有机电子转移型烧孔体系中,混杂两种电子给体-苯并卟啉锌衍生物分子,可增加吸收带的非均匀宽度。本文通过对光谱孔的宽度和烧孔效率的讨论,证明了混杂电子给体的方法对孔宽和烧孔效率无明显影响,可以达到增加此类材料体系的烧孔数目,提高信息存储密度的目的。     

卟啉类有机体系THP／PMMA的永久性光谱烧孔

首次报道了四-对羟基苯基卟吩/有机玻璃体系(THP/PMMA)的单光子永久性光谱烧孔.研究了烧孔特性和成孔条件.测量了孔的稳定性,在液氦温度下孔的保存时间已超过几个小时.实现了孔的擦除和重复烧孔.探讨了烧孔机制,认为激光诱导质子转位变构是导致该体系永久性光谱烧孔的原因.     

光子选通多重光谱烧孔中的光致填孔机制

报道了给体－受体电子转移型材料ｚｉｎｃ－ｔｅｔｒａｐｈｅｎｙｌｂｅｎｚｏｐｏｒｐｈｒｉｎ＋ｚｉｎｃ－ｔｅｔｒａｐｈｅｙｌ ｂｅｎｚｏｔｒｉｂｅｎｚｏｐｏｒｐｈｒｉｎ／ｐｈｙｄｒｏｘｙｂｅｎｚａｌｄｈｙｄｅ／ｐｏｌｙ（ｍｅｔｈｙｌ）ｍｅｔｈａｃｒｙｌａｔｅ的光子选通多重烧孔过程。结果表明要获得高质量的多重光谱孔，从短波往长波的逐次烧孔更为有效。其影响来自与波长有关的光致填孔现象，造成该填孔的主要机制     

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     

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.     

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。     

不同选通条件下对光谱烧孔孔深的研究

本文从理论上分析了低激发密度下，选通光分别为脉冲光和连续光时，孔深随时间的变化，得到可以通过脉冲光烧孔、连续光选通的方法缩短烧孔时间．应用ＢａＦＣｌ０．５Ｂｒ０．５：Ｓｍ２＋（２％）进行了实验，分析了单脉冲烧孔的孔深．     

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．     

Persistent spectral holes in external fields

Experimental results and model calculations of the effects of an external electric field on persistent spectral holes are reviewed. Hole-burning spectroscopy of impurity centers in crystals and amorphous solids yields information on various properties of the centers and their interaction with the electric field. The applications of persistent spectral hole burning presented in this paper include: optical-data storage in the electric-field dimension, modulation and pulse shaping of light beams, determination of the Debye-Waller factor of host-guest systems with strongly inhomogeneously broadened transitions, detection of ultra-sound and high-frequency acoustic phonons. The effects of a magnetic field and external pressure on persistent spectral holes are discussed.     

A new system of photon-gated persistent spectral hole burning material for frequency-domain optical storage

Two-color persistent spectral hole-burning was achieved for the first time for a new system Zn-tetrabenzoporphin-crotonic acid/phenoxy resin at 20 K. The time dependence experiments show that the spectral holes are persistent at the temperature of 20 K. These holes can be erased by laser irradiation and reversible holeburning is performed. The hole width remains almost constant during the erasing process.     

Programmable frequency reference for subkilohertz laser stabilization by use of persistent spectral hole burning

We report what is believed to be the first demonstration of laser frequency stabilization directly to persistent spectral holes in a solid-state material. The frequency reference material was deuterated CaF(2): Tm(3+) prepared with 25-MHz-wide persistent spectral holes on the H(6)(3)?H(4)(3) transition at 798 nm. The beat frequency between two lasers that were independently locked to persistent spectral holes in separate crystal samples showed typical root Allan variances of 780+/-120Hz for 20-50-ms integration times.     

Nonresonant hole burning spectroscopy of the relaxor ferroelectric PLZT

The polydispersive dielectric response of a lanthanum-modified lead zirconate titanate relaxor ferroelectric was studied using nonresonant hole burning (NHB) spectroscopy. The dynamic heterogeneity of this material was evidenced by the fact that it was possible to burn frequency-dependent spectral holes. The maximum position of the spectral holes depended on the square root of the pump frequency Ω. The refilling of the spectral holes was monitored subsequent to excitation using various pump frequencies. The refilling data could be collapsed onto a master curve by re-scaling them, again, using Ω^−0.5 as scaling factor. The refilling time was found to be much longer than the time scale addressed most by the pump process. This behavior underscores the importance of domain wall motions for the dielectric relaxation process.     

Coherent hole-burnings induced by a bichromatic laser field

In a Doppler-broadened three-level Λ-type system driven simultaneously by a coupling laser and two equal-amplitude saturating laser fields with a frequency difference 2δ, the absorption spectrum of a weak probe laser exhibits multiple deep spectral holes through coherent hole-burning CHB with controllable numbers, widths, depths, and positions. More significant, changing δ or lasers directions, CHBs can degenerate into narrower and deeper spectral holes where the slope of the refractive index is very steep. The multiple narrow spectral holes in a single absorption profile are expected to have potential applications in high density storage, optical information processes, and slow-light.     

Evaluation and properties of a model for the determination of internal electric fields in proteins from the Stark effect of spectral holes

In this paper, we further evaluate a model for the analysis of Stark-shifted spectral holes, which allows for the determination of electric fields generated at the site of probe molecules by their host environment. In contrast to the conventional treatment of the Stark effect, our model regards both the internal electric field and the externally applied electric field as perturbations to the Hamiltonian of the probe molecule. Diagonalization of the Hamiltonian and fitting to the Stark-shifted spectral holes allows for the extraction of the internal electric field. We apply this model to Stark-shifted spectral holes burnt in a biological system, namely, myoglobin. Determining internal electric fields at the active sites of biological systems is particularly interesting, as these fields may contribute substantially to the function of such systems. As input to the data analysis procedure, state energies, transition dipole moments, and the local field factor are needed. We demonstrate here how the number of electronic states, the choice of local field factor, and the energies of several excited states of the probe molecule affect the resulting internal electric fields.     

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.     

Spectrally narrow, long-term stable optical frequency reference based on a Eu3+:Y2SiO5 crystal at cryogenic temperature

Using an ultrastable continuous-wave laser at 580 nm we performed spectral hole burning of Eu(3+):Y(2)SiO(5) at a very high spectral resolution. The essential parameters determining the usefulness as a macroscopic frequency reference, linewidth, temperature sensitivity, and long-term stability, were characterized using a H-maser stabilized frequency comb. Spectral holes with a linewidth as low as 6 kHz were observed and the upper limit of the drift of the hole frequency was determined to be 5±3 mHz/s. We discuss the necessary requirements for achieving ultrahigh stability in laser frequency stabilization to these spectral holes.     

Distribution function,population inversion and FIR gain of hot holes in germanium in crossed electric and magnetic fields

The energy distribution function of hot heavy and light holes, the degree of population inversion and of the accumulation of light holes are determined from an investigation of near infrared light absorption in crossed magnetic and electric fields. Analysis of the data shows that inversion of the population is caused not only by accumulation of light holes, but also by weaker heating of light holes compared with heavy holes and drift in momentum space. The numeral value and spectral dependence of the FIR gain, are determined. The distribution function and optical gain are in good qualitative and quantitative agreement with the values calculated by the Monte Carlo method. The power of the far-infrared laser is estimated.