【摘 要】
：
In this letter, a new single three-dimensional (3D) laser projector is proposed. As liquid crystal (LC) can produce two image patterns with orthogonal polarization states at 120 Hz, only one projector is required in this approach for reconstruction of a 3
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
In this letter, a new single three-dimensional (3D) laser projector is proposed. As liquid crystal (LC) can produce two image patterns with orthogonal polarization states at 120 Hz, only one projector is required in this approach for reconstruction of a 3D object. The light source is made up of RGB (red, green, and blue) lasers because laser has lots of advantages such as longer life, higher brightness, and larger color gamut. A novel diffusive media with good polarization-maintaining quality is used as rear projection screen for its high transmission efficiency (～90%) and low reflection efficiency. When laser incidents into the diffusive media, which contains lots of spherical particles with sizes between 2 and 15 \mu m, laser is scattered randomly and the laser speckle is reduced. A spatial phase mask is also inserted into the optical path to reduce speckle. With these techniques, the speckle contrast is reduced to 0.1 and the quality of image patterns has been greatly improved.
其他文献
本文叙述一种电弧加热的气动CO2激光器功率输出的实验研究，这种激光器的优点是能连续运转而且流动参量能在一个很宽的范围内变化。
Digital image difference method monitorring coating status of microsphere targets automatically is suggested. A CCD micro-imaging system is developed for monitoring the status of bouncing and adherence between microspheres and the bouncing pan. A new boun
本文报道了用水平无籽晶气相生长法(HUVT)制造的可调谐二极管激光器的性能参数,在12K温度下,脉冲阈值电流密度为370A/cm~2,直流阈值电流密度为440A/cm~2.在13K温度下的电流调谐率为0.15cm~(-1)/mA.在400mA工作电流下的温度调谐率为2.3cm~(-1)/K.
HPD(血卟啉衍生物)光敏疗法是一种治疗恶性肿瘤的新方法，它给一些用常规疗法无效的癌肿病人带来了福音。还在初期，此疗法的基本设想已被许多研究者独立证明。此法治疗恶性肿瘤比其他方法有更好的疗效，实际上在某些病例中它是唯一有效的方法。
日立制作所研制成“扫描光子显微镜”，其原理是：当光照射半导体晶片时，在有结晶缺陷、污染、损伤的部分所产生的表面光电压比正常部存的要低，利用这一现象在晶片上进行光斑扫描，以非接触方式读出各点产生的光电压变化，经数据处理后用与电压值相对应的浓淡图像显示。
Based on total reflection principle, a compact liquid-refractive index measuring equipment was designed and fabricated, in which a diode laser was used as light source and a charge-coupled device (CCD) as photodetector. The influence on measurement accura
理论分析了紫外准分子激光相位掩模法刻写光纤布拉格光栅时相位掩模板干涉场的形式以及对比度特征,并结合干涉光场对比度与光纤光栅折射率调制度的关系,通过实验证明了随着光纤与相位掩模板距离的增加,相位掩模板形成的干涉光场对比度会越来越低,这种对比度的降低导致了光纤布拉格光栅损耗的增加。进一步的分析显示:非±1级衍射能量的增加、紫外光束斜入射角度增加、紫外激光时空相干性的恶化等因素也会导致干涉场对比度降低,因此实验上要尽量避免这些不利因素的影响。该研究结果对高功率FBG刻写装置的光源、相位掩模板的选择以及光路调试等
为了提高反坦克导弹在复杂背景下的目标识别能力，可利用目标和背景的偏振特性差异实现目标探测和识别。采用激光主动偏振成像方法获取车辆目标在无背景、草地背景、混凝土背景和沙土背景4种典型背景下的强度图像和偏振图像，比较分析两类图像的边缘强度、清晰度和空间频率，结果表明，偏振图像的边缘和细节特征比强度图像更好，有利于在复杂背景中识别车辆目标。激光主动偏振成像方法对提高反坦克导弹在复杂地物背景下的目标识别能力有重要意义。
We demonstrate a simple technique to filter out the continuum background in filament-induced remote breakdown spectroscopy. By inserting a polarizer before the detector, the continuum background was reduced by more than 42% in filament-induced breakdown s