聚焦透镜对喇曼激光器的影响

本文报导了在同样气压等条件下,喇曼池的聚焦透镜对自调Q及BDN调Q甲烷喇曼激光器的影响,并对两者进行了比较。     

Theoretical modelling of the effect of photon lifetime on the output dynamics of Er-doped distributed feedback fibre lasers

By employing a simple model of describing three-level lasers, we have theoretically investigated the effect of photon lifetime on the output dynamics of Er-doped distributed feedback fibre lasers. And based on the theoretical analysis we have proposed a promising method to suppress self-pulsing behaviour in the fibre lasers.     

The mechanism research of the Cr^4＋Nd^3＋：YAG laser

The 946nm diode-pump microchip self-Q-switched laser of a chromium and neodymium codoped yttrium aluminum garnet crystal material (Cr^{4+}Nd^{3+}:YAG) is studied, especially about its physical mechanism of operation. The {}^4F_{3/2}→{}^4I_{9/2} transition of Nd^{3+} ion is beneficial to achieving laser oscillation in a quasi-three-level system based on coating the cavity mirrors of the microchip with films that suppress the 1064nm operation and enhance the 946nm laser. The Cr^{4+} ion is a saturable absorber. The initial loss N_{t1} is high, which acts as the threshold for laser oscillation. The stable loss N_{t2} is low because the Cr^{4+} ion is acceleratively bleached by the fast enhancement of the oscillating laser. The high N_{t1}, small N_{t2} and fast progresses permit the oscillating laser of the Cr^{4+}Nd^{3+}:YAG to have a good self-Q-switched property whose full width at half maximum is about 4.2ns. Its highest laser power is about 5.7mW. Its peak power is about 150W. Its good fundamental transverse TEM_{00} mode results from the absorption bleaching established by both the pump and oscillating lasers, which suppress other transverse mode and allow the oscillation only in the fundamental transverse TEM_{00} mode.     

节流制冷器自调机构低温形变特性分析

微小型节流制冷器具有体积小、重量轻、可靠性高、启动速度快、冷端无运动部件等突出优势,在红外探测器、红外导引头以及其他电子器件冷却领域实现了大量应用。自调式节微型流制冷器特有的自调机构通过感应节流后温度变化来进行流量(制冷量)的调节,不仅能够有效利用有限的循环工质获得最大的制冷量,而且能够实现高的温度稳定性。为了实现对自调式微型节流制冷器自调机构形变的量化分析,指导自调机构波纹管选型,文中针对内充式自调机构充压波纹管建立了三维数值模型,采用变物性参数,分析了不同充注工质及不同波纹管材料下的低温条件形变特性。研究结果表明,所建立的数值分析模型预测结果与实际测量误差在5%以内,证实了模型的准确性。波纹管是自调机构发生形变的主要部件,除充注压力外,自调机构温度分布的不均匀,对于其形变特性也有一定影响。     

基于DSP的自调匀整系统设计

本文主要介绍了基于DSP控制器实现并条机的自调匀整控制系统的硬件设计,其中详细介绍了DSP模块、伺服电机模块、PLC逻辑控制模块的设计电路。     

直接从钛宝石激光器获得超连续光谱

采用啁啾镜和棱镜对相结合补偿色散的方法在自调Q自锁模钛宝石激光器腔内直接产生了超 过一个倍频程的超连续光谱，光谱范围从460nm到1000nm；这是飞秒激光器输出光谱在短波 波段第一次突破500nm.这将使得脉冲的载波包络偏移频率的测量装置得到大大简化，同时也 提高了光频测量的稳定性. 关键词： 超连续光谱 啁啾镜 自调Q自锁模 钛宝石激光器     

Nd,Cr:YAG自调Q自锁模激光器的研究

实验采用光纤耦合激光二极管泵浦,得到了二极管泵浦Nd,CrYAG自调Q自锁模1.064 μm激光输出,其锁模调制深度达到了近100%,其输出功率最高可达1.9 W,平均输出功率稳定性优于1%.实验表明平均输出功率、重复频率和脉冲宽度随泵浦功率增加而上升.     

智能仪表的自动调零分析

通过分析智能仪表产生零漂的原因,探讨了消除零漂的具体方法。     

掺镱光纤激光器时域特性的研究

利用光纤的非线性效应－受激布里渊散射（SBS）和二色镜的选频利用,以国产的激光二极管作泵浦源,在掺镱光纤激光器中得到了稳定的自调Q光脉冲输出,脉冲重复频率为29．4MHz,脉冲光宽度约为2ns。