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摘要

A new configuration of the confinement structure is utilized to improve optoelectronic performance, including threshold current, ac current gain, optical bandwidth, and optical output power of a single quantum well transistor laser. Considering the drift component in addition to the diffusion term in electron current density, a new continuity equation is developed to analyze th

PDF全文 Chinese Optics Letters | 2017,15(06):062501
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In this Letter, we present a novel design method of image-side telecentric freeform imaging systems. The freeform surfaces in the system can be generated using a point-by-point design approach starting from an initial system consisting of simple planes. The proposed method considers both the desired object–image relationships and the telecentricity at the image-side during the

PDF全文 Chinese Optics Letters | 2017,15(06):062202
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在高功率激光参数测量中, 高倍率衰减方案设计是空间分布测量的关键。分析了远场测量光学系统, 将95%环围能量直径作为评价远场测量系统的重要指标, 明确了高倍率衰减对远场测量结果的影响, 确立了高倍率衰减方案的设计原则。利用Virtual Lab软件, 针对单个平板、成对平板、成对楔板三种常见的高倍率衰减方案, 分析了衰减片摆放角度、位置、厚度、成对衰减片间距等因素对于远场测量系统的影响。针对焦距3 000 mm

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对高功率激光多程放大系统中脉冲强度的三维时空变化特性进行了详细的数值分析,理论计算表明具有一定时空分布的光束在放大过程中会产生复杂的时空演化畸变,给脉冲功率的整形预测带来了一定的难度。提出了输入输出积分能量曲线拟合的方法,实现对多程放大系统输入脉冲波形的高精度反演预测,对于方波和复杂多台阶波形输出都能得到很好的预测结果,方波预测相对功率偏差低于0.032%,三台阶脉冲相对功率偏差为0.

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片状放大器腔内钕玻璃表面的洁净度是保证放大器高工作性能和长寿命的关键指标,而合理的腔内流场分布是放大器保持腔内洁净的前提条件。运用计算流体力学方法,利用Fluent软件对纯氮气冲洗片状放大器过程中的腔内流场进行模拟,并在样机上验证了模型的有效性;通过调整放大器的进出气口结构及位置排布,获得了最佳的流场分布。实验结果表明,相比未优化放大器,优化后的放大器仅使用一半时间就可以达到相同的腔

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为了解决双通单平行光栅对压缩器构型里光栅失调问题,设计了一套结构简单的监测系统方案,根据系统结构进行数值模拟,通过模拟分析提出了一种新的光栅在线调节方法。考虑两块光栅不同维度的失调量,结合模拟得出监测量与失调量的关系,根据监测量变化将失调量一一分离调节,最后将真空室中的失调光栅调回理想位置。对该方法进行了误差和可行性分析,根据压缩器构型参数,得到调节精度范围为0.30~2.78 μrad。

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A fiber-based,high precision long-term stable time synchronization system for multi-channel laser pulses is presented,using fiber pulse stacker combined with high-speed optical-electrical conversion and electronics processing technology. This scheme is used to synchronize two individual lasers including a mode-lock laser and a time shaping pulse laser system. The relative tim

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Laser beam alignment is very important for high-power laser facility. Long laser path and large-aperture lens for alignment are generally used, while the proposed alignment system with a wedge by far-field sampling technique reduces both space and cost requirements. General alignment system for large-aperture laser beam is long in distance and large in volum because of taking n

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在单光束照明3PIE(Ptychographic Iterative Engine)方法中,照明光垂直照射在待测样品表面,没有考虑照明光倾斜对重构结果的影响。在单光束照明3PIE方法的基础上提出了双光束照明3PIE方法,同时模拟分析了初始猜测照明光中相位倾斜因子对成像质量的影响。双光束照明3PIE方法在迭代恢复样品的过程中,两束照明光均用于更新同一样品的复振幅分布,理论分析和实验结果均表明,双光束照明3PIE方法能够提高算法的收

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摘要

Amplified spontaneous emission (ASE) causes the decrease of the inverted population density and the nonuniformity of gain in slab amplifier for high power laser systems. In this paper, a three dimension model, based on the data in SG-II, in which the residual reflection in the cladding and the ASE process are taken into consideration, is built to analyze the space distribution

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