采用高温固相法合成了Ca3 (PO4)2:RE3 (RE=Eu, Dy, Ce, Tb)系列发光材料, 研究了其发光性质。研究表明Ca3 (PO4)2: RE3 在紫外区域均能有效被激发, 有很强的荧光发射, 且发光范围覆盖蓝到红光波段, 是一类可以紫外激发实现白光LED用的潜在荧光粉。在0.005~0.03 mol 浓度范围内, Eu, Dy和Ce掺杂的荧光粉的发光都发生了浓度淬灭, 分别对应于0.025 mol, 0.025 mol和0.02 mol, 而Tb3 掺杂样品表现出高的发光淬灭浓度。
We demonstrate a 7-bit photonic true-time-delay (TTD) system which uses an 8\times8 micro-optical-electro-mechanical system (MOEMS) optical switch for phased array antennas (PAAs) beamforming applications. The switch controls the optical signal to pass b
制成了一台具有简单横向放电结构的采用高压脉沖引发的氟化氫化学激光器。该系统发射最大能量为11焦耳、半宽度约为100毫微秒的脉沖。相对于输入脉沖发生器的电能效率接近4%。然而,对放电室内电压与电流的研究表明,相对于气体放电中实际贮存的能量效率是非常高的。讨论了最佳运转下的放电参量。
材料必然限制装置的性能。因此,对所需特性的鉴别、新型和改良材料的设想以及这些设想的实现,将推动光学系统的发展。
光激射器(laser)和微波激射器(maser )这两个术语, 是可互换地用来描述产生微波、红外到可见光范围内相干电磁辐射的新型量子电子器件。这些词是“光的受激辐射放大”(light amplification of Stimulated emission of radiation)和受激辐射的“分子放大”(molecularamplifkation)两短语的英文字首缩拼, 虽然按其用法现在最好用“光激射器”称呼红外和可见光范围的器件, 用“微波激射器”称呼微波和毫米波范围的器件, 但在本文中这两个词是可
A two-section offset quantum-well structure tunable laser with a tuning range of 7 nm was fabricated using offset quantum-well method. The distributed Bragg reflector (DBR) was realized just by selectively wet etching the multiquantum-well (MQW) layer abo
An electron beam is obtained using laser wakefield electron accelerator, and converted into a \gamma-ray source after undergoing bremsstrahlung radiation in a dense material. A quasi-monoenergetic structure is observed when the length of the plasma chann
Remotely sensing an object with light is essential for burgeoning technologies, such as autonomous vehicles. Here, an object’s rotational orientation is remotely sensed using light’s orbital angular momentum. An object is illuminated by and partially obst