全视差二步彩虹全息

提出一种利用正弦光栅的色散特性 ,并用两步记录法制作全视差彩虹全息的方法。由于未使用狭缝限制物光波 ,再现像无垂直视差损失 ,也无需在狭缝像位置观察。     

双波长光纤光栅的矩阵分析

本文在分析双波长光栅特征的基础上,结合耦合模理论和矩阵分析方法,提出了分析双波长光栅的一种数学模型,并在此基础上,采用矩阵分析方法对双波光栅进行了理论分析,得到的结果与实验结果基本吻合。     

High-Accuracy Measurement of the Dispersion of Chirped Fiber Gratings

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｆｉｂｅｒｇｒａｔｉｎｇｓａｒｅｐｒｏｖｅｄｔｏｂｅｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｒｅｃｅｎｔｄｅｖｅｌｏｐｍｅｎｔｓｉｎｔｈｅｆｉｅｌｄｏｆｏｐｔｉｃａｌｆｉｂｅｒｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓａｎｄｓｅｎｓｉｎｇ .Ｔｈｅｙａｒｅｌｉｋｅｌｙｔｏｈａｖｅａｐｐｌｉｃａｔｉｏｎｉｎｔｗｏｍａｉｎａｒｅａｓ:ｄｉｓｐｅｒｓｉｏｎｃｏｍｐｅｎｓａｔｉｏｎｉｎｌｏｎｇ ｈａｕｌｆｉｂｅｒｎｅｔｗｏｒｋｓ[1,2 ]ａｎｄｗａｖｅｌｅｎｇｔｈｒｏｕｔｉｎｇｉｎｗ…     

相位锁定循环投影技术及其应用

由一组规则栅线投影到物体表面的变形光栅,采用相位锁定循环解调算法解调出含有物体表面高度信息的相位.该技术的最大优势是不需传统的相位去包裹.利用该算法对二维栅线图扫描确定的相位.本文给出了一个典型试件的实验结果和分析.     

表面高分辨弹性反冲探测分析

在中国原子能科学研究院 HI- 1 3串列加速器上建立了用 Q3D磁谱仪动量分析和ΔE- E粒子分辨对材料表面进行高分辨的弹性反冲探测分析技术 .用 1 0 0 Me V12 7I对 C/Li F多层样品的深度分布分析表明 ,表面分辨达到 1 .2 nm.所建立的ΔE(气体 ) - E(半导体 )望远镜探测器可同时分析从轻至中重的所有元素 .实测了新光电材料 Ga N,La2 Sr Cu O4 超导膜和新超硬材料 C3N4 (Si)等样品. High resolution depth profiling technique with elastic recoil detection analysis has been developed at the HI 13 tandem accelerator of CIAE. A depth resolution of 1.2 nm was achieved at the surface of the samples with the Q3D magnetic spectrometer and the focal plane detector. From light to medium heavy elements were simultaneous analyzed with a small Δ E E telescope. The method was applied to depth profile analysis of C/LiF multilayers, La 2SrCuO 4 superconductor and GaN foil samples.     

用莫尔条纹测金属丝杨氏模量

把莫尔条纹的实验装置引入到金属丝伸长量的测量上 ,其测量结果比传统的光杠杆法测量精确度高 ,实用性强。     

导体栅的静电屏蔽作用

采用保角变换的方法 ,计算了导体栅作屏蔽罩时的场强分布 ,所得结果表明导体栅具有很好的静电屏蔽作用     

Estimation of the Refractive Index Change in Glass Induced by Femtosecond Laser Pulses

It is known that local refractive index change occurs when femtosecond laser pulses with extremely high peak power are launched into glass. We focused 130-femtosecond laser pulses of 800 nm into the bulk of glass and examined the shape of the induced refractive index change. We found that the length of the spot of the refractive index change along the optical axis reached about 30 μm despite the diameter being about 2 μm. To estimate the distribution of induced refractive index change, we fabricated Bragg grating by scanning the focused spot and calculated the amount of the change by applying Kogelnik’s coupled mode theory to the measured diffraction efficiencies of the higher order diffracted beams.     

Single-Mode Operation of Broad-Area Diode Laser at 670 nm by External Cavity Configuration with a Diffraction Grating

We demonstrate the single mode operation of a broad-area diode laser at 670 nm by means of an external cavity configuration using a diffraction grating. The output power of 150 mW is obtained with a spectral width of 40 MHz.     

Effect of Material Response Time on Optical Bistability in Nonlinear Distributed Feedback Gratings

The dynamic behaviors of nonlinear periodic waveguides with a finite material response time have been investigated by numerically solving both the coupled-mode equations and Debye relaxation equation. When the response time of the nonlinearity is more than the transit time through the grating, a modulational instability is sufficiently suppressed and one can obtain optical bistability. Unlike a nonlinear Fabry-Perot resonator or ring resonators, overshoot in the transmission never takes place in the case of zero detuning. However, a relaxation (or damped) oscillation always takes place in the presence of detuning. It is also found that the switch-on time depends on the material response time and the switch-off time is almost independent of it.