An experimental and simulation study of warm dense carbon foams at ambient density (ne ～ 1021 cm-3) is presented. This study of isochorically heated foams is motivated by their potential application in carbon
We report a 307 W 1018 nm Yb-doped fiber laser pumped by a single 976 nm laser diode. The cavity slope efficiency is up to 75.9% and the amplified spontaneous emission is suppressed by 54 dB. The beam quality of the output laser has an
Objective image quality measure, which is a fundamental and challenging job in image processing, evaluates the image quality consistently with human perception automatically. On the assumption that any image distortion could be modeled as the difference b
Optical detectors with single-photon sensitivity and large dynamic range would facilitate a variety of applications. Specifically, the capability of extending operation wavelengths into the mid-infrared region is highly attractive. Here we implement a mid
A method to fabricate fiber Bragg grating (FBG) in an optical microfiber (OM) from a conventional photosensitive fiber is proposed in this letter. The cladding of a conventional photosensitive fiber is etched to 17 \mu m. The etched fiber is drawn to an
Surface-plasmon (SP) enhancement of amorphous-silicon-nitride (a-SiNx) light emission with single-layer gold (Au) waveguides is experimentally demonstrated through time-resolved photoluminescence measurement. The a-SiNx active layer with strong steady-sta
A Mach-Zehnder interferometer (MZI) based on two spherical structures is proposed and temperature and humidity are measured simultaneously. The device is fabricated by inserting two spherical structures into a single mode optical fiber (SMF). The results
考虑在共振强驱动场作用下二能级原子所构成的Dressed原子和探测光的相互作用。把无限多个互相耦合的一阶微分方程(主方程)简化为四个独立的方程,从而得到Dressed原子与探测光相互作用的Bloch方程,可以把普通原子与光相干相互作用的全部过程推广到Dressed原子。求解了Dressed原子对两个频率探测光的极化率,研究了Dressed原子中的位相共扼波的产生和特性。