A High Efficiency Yb3+-doped Fiber Ring Cavity Laser with Narrow Line-width

A novel Yb3+-doped fiber ring cavity laser pumped by a 977 nm laser diode is presented with its output laser wavelength of 1060 nm. Based on a fiber Bragg grating (FBG), the laser exhibits 0.20 nm line-width, 7.5 mW laser output power, 40 dB signal-to-noise ratio (SNR) and 66% slope efficiency.     

Measurement of Thermal Lens Focal Length and Its Effect on Laser Output Characteristics in LD End-pumped Nd∶YVO_4 Lasers

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｌａｓｅｒｄｉｏｄｅｐｕｍｐｅｄｓｏｌｉｄ ｓｔａｔｅｌａｓｅｒｓｈａｖｅａｄｖａｎｔａｇｅｓｏｆｈｉｇｈｅｆｆｉｃｉｅｎｃｙａｎｄ ｇｏｏｄｂｅａｍｑｕａｌｉｔｙ .Ｈｏｗｅｖｅｒ ,ｔｈｅｔｈｅｒｍａｌｌｙｉｎｄｕｃｅｄｌｅｎｓｉｎｇａｉｎｍａｔｅｒｉａｌｓｌｉｍｉｔｓｔｈｅｏｕｔｐｕｔｐｏｗｅｒｏｆｌａｓｅｒｓｗｉｔｈｇｏｏｄｂｅａｍ ｑｕａｌｉｔｙｔｏａｎａｒｒｏｗｐｏｗｅｒｒａｎｇｅａｎｄｍａｋｅｓｔｈｅｂｅａｍｄｉａｍｅｔｅｒ ,ｂｅａｍｄｉｖｅｒｇｅｎｃｅａｎ…     

非线性波导腔耦合特性研究

对一种非线性波导耦合腔进行了理论和实验研究。研究表明,该系统的透过率随入射光强变化。对于不同的初始偏置、耦合区长度和入射功率系统具有微分放大、限幅、反常耦合和双稳运行等不同的响应。     

球体谐振腔(Ⅱ)——球体腔中的喇曼振荡

本文对球体谐振腔与法布里-珀罗腔作了比较。详细讨论了球体腔中产生的喇曼振荡、振荡输出谱及场分布等特性。从水滴及酒精液滴的实验结果分析了输出共振和输入共振,对实验中还观察到的液滴中的高阶斯托克斯振荡和组合斯托克斯振荡作了讨论。     

Cavity Field Spectra of the Intensity-Dependent Two-Mode Jaynes–Cummings Model

The cavity field spectrum of a two-level atom interacting with two modes of the radiation field through intensity-dependent coupling in an ideal cavity is investigated. The results for the initial fields in pure number states, coherent states, and squeezed vacuum states are calculated. We find that the frequency of one mode is tuned by the intensity of the other mode when the two modes are both in pure number states or coherent states. A complicated multipeak structure appears when both field modes are in a superposition of number states initially.     

改造测量数据确定空洞位置的数学模型

对所给测量数据加以改造 ,使弹性波的测量长度相同 ,找出了空洞的位置及洞径     

用光腔衰荡光谱法判断钕玻璃体损伤的产生

运用光腔衰荡光谱技术测量钕玻璃在激光辐照下其透过率的变化,判断出钕玻璃体损伤的产生。实验采用直腔型衰荡光腔,通过检测钕玻璃在强激光辐照下产生应力时其透过率的变化,测试出了钕玻璃在强激光辐照下产生体损伤的激光能量密度。该测试方法灵敏度高,且对测试元件无破坏作用。     

高Q法布里-珀罗腔中二阶串级非线性相移

在高Q值法布里珀罗腔中研究了二阶串级非线性相移.结果表明,通过改变入射光强,可以全光学控制基频光束的透射率和它的相移.基频透射光束的非线性相移相对入射光强的变化率被提高了腔精细度的平方.这可用作光子学开关器件 关键词： 二阶串级效应 法布里珀罗腔 非线性相移     

Neoteric Advances in Oxygen Bridged Triaryl Boron-based Delayed Fluorescent Materials for Organic Light Emitting Diodes

Since their first demonstration, thermally activated delayed fluorescence (TADF) materials have been emerged as the most promising emitters because of their promising applications in optoelectronics, typified by organic light-emitting diodes (OLEDs). In which, the rigid oxygen bridged boron acceptor-featured ( DOBNA ) emitters have gained tremendous impetus for OLEDs, which is ascribed to their excellent external quantum efficiency (EQE). However, these materials often displayed severe efficiency roll-off and poor operational stability. Therefore, there needs to be a comprehensive understanding of the aspect of the molecular design and structure-property relationship. To the best of our knowledge, there is no detailed review on the structure-function outlook of DOBNA -based emitters emphasizing the effect of the nature of donor units, their number density, and substitution pattern on the physicochemical properties, excited state dynamics and OLED performance were reported. To fill this gap, herein we presented the recent advancements in DOBNA -based acceptor featured TADF materials by classifying them into several subgroups based on the molecular design i. e. donor-acceptor (D−A), D−A-D, A−D-A, and multi-resonant TADF (MR-TADF) emitters. The detailed design concepts, along with their respective physicochemical and OLED performances were summarized. Finally, the prospective of this class of materials in forthcoming OLED displays is also discussed.