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。
通过双离子束溅射方法在蓝宝石、硅衬底上制备了单层SiO2薄膜，分析了SiO2薄膜残余应力、表面形貌、微观结构以及光学性能(可见-近红外0.4~1.2 μm和中红外3~5 μm波段)在400 ℃~1 000 ℃温度范围内的演化规律.研究结果表明：在400 ℃附近，SiO2薄膜残余应力存在局部极小值；SiO2薄膜光学性能的演化与膜层表面质量、内部残余应力及微观结构变化密切相关；经1 000 ℃高温处理后，蓝宝石窗口表面SiO2薄膜红外透射性能仍能保持很好的稳定性，且膜层表面没有出现显著的气泡、开裂等损伤形貌.
用越来越短的时间分辨率来测量物理现象的变化情况是当代研究和发展的一个主要部分。实际上，在激光聚变、时间分辨光谱学和激光研究这样的领域,了解瞬态过程(所谓短脉冲）和稳态过程对于未来的发展是至关重要的。