共查询到20条相似文献,搜索用时 109 毫秒
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一般动态聚焦打标机在聚焦镜前加一套准直扩束系统,随扫描振镜的转动,同步调整准直扩束系统的位置,使激光束始终聚焦在打标平面上。但对更大幅面,聚焦效果不够理想,边缘部分比较模糊。为了适应更大幅面的打标,在原准直扩束系统的基础上,设计了动态准直扩束系统,通过优化设计准直扩束系统的运动轨迹,进一步提高了聚焦性能。经优化后的聚焦指标性能提高了20%,实现了小光斑、大范围的激光打标。同时利用多项式对扩束镜的轨迹进行拟合,提高打标速度,并利用分段线性插值查找表的方法对边缘部分的枕形失真进行校正。经装机测试,该系统打标效果好,能满足使用要求。 相似文献
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光纤激光打标机较其他打标机具有光束质量更好,光使用率更高,输出稳定功率,环境适应性强,无需水冷,体积小等一系列优势.本文介绍了光纤激光打标机的组成原理及应用,通过分析常见故障,着重提出了原因和解决方法,为快速排除故障提供参考. 相似文献
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针对大型机械零部件表面激光打标的特殊要求,对激光打标技术和工艺过程进行了研究。本文介绍了一种便携式光纤激光打标头的结构设计,通过使用便携式激光打标头取代固定式激光打标头,使激光打标技术能有效应用于不便于移动的大型零部件表面打标,进一步拓展了激光打标的应用范围,并提高了激光标记机的使用灵活性。 相似文献
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激光打标系统的核心问题是如何控制激光头的精确运动.插补和校正算法是激光打标系统数据处理的重要组成部分,直接影响到打标结果的质量和效果.介绍了以DSP-BF533为硬件平台,采用优化的直线插补算法和畸变校正算法来设计的打标运动控制系统.该系统成功完成了按照打点精度对矢量图形数据的良好输出,实现了对激光头的精确控制,提高了激光打标系统的打标精度. 相似文献
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为有效应对红外成像制导武器,激光定向干扰技术在近年得到重点发展,并有望成为未来红外对抗的主要方式。着眼于对激光干扰条件下红外系统成像特性的研究需求,对机载激光定向干扰从发射、大气传输、光学系统传输以及探测器响应的全链路过程进行了分析建模,构建了激光干扰条件下红外系统成像特性的仿真模型,最后通过试验验证了文中方法和模型在对激光的红外成像灰度等级、成像光斑及灰度分布特性、成像饱和与致盲毁伤效果方面能够有效反映红外成像系统对激光的实际响应特性,并取得与实测试验相近的仿真结果,从而为后续深入研究激光定向干扰效能奠定基础。 相似文献
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A closed-form nonlinear model of the distributed feedback (DFB) laser accounting for all of its distortion mechanisms is presented. The laser's nonlinearity is analyzed by combining Volterra models of the laser's driving circuit and pn heterojunction nonlinearity with rate equation based models of the active region nonlinearities. The prediction of the model is then compared to distortion measurements 相似文献
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Gain saturation coefficients of unstrained- and strained-layer multiple-quantum-well lasers were measured experimentally. These coefficients were higher in lasers that had compressive strain in their active-layer wells: 2.45×10-17 cm3 with unstrained wells and 12.6×10-17 cm3 with strained wells. The higher gain saturation coefficient in lasers with strained active-layer wells is related to their higher linear TE mode gain coefficient. The linearity factor (K factor) between a laser's damping constant and the square of the laser's resonant frequency decreased slightly with the introduction of the strain in the laser's active layer wells. This factor, however, took the value of about 0.2×10-9 s for each of these lasers 相似文献
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Electron capture from a quantum dot's (QDs) wetting layer is described by Fermi's golden rule that relates the transition rate to the density of final states. The wetting layer capture causes a brief nonequilibrium electron distribution between the QD ground state and its wetting layer states and can slow a QD laser's modulation response. This effect is studied for time constants and capture conditions relevant to self-organized InAs QDs. It is shown that even a moderately fast electron capture consistent with present low temperature measurements can limit a QD laser's modulation speed. 相似文献
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通过对双环微波光子振荡器(DMPO)的理论分析和研究,探讨了双环结构的优点和激光光源的相对强度噪声、光纤的长度以及振荡器的结构对MPO的相位噪声的影响。分析结果表明,MPO的相位噪声随着频偏的平方减小,并且与振荡频率无关;相对强度噪声越小,光纤越长,使得振荡器的相位噪声更小。分析结果可为MPO的实验研究提供理论依据。 相似文献
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D.-L. Cheng Tsu-Chiang Yen En-Chi Liu K.-L. Chuang 《Photonics Technology Letters, IEEE》2004,16(6):1435-1437
Mode hopping is characterized by a stochastic exchange of power between two longitudinal modes of a laser, inducing a high-level intensity noise in the laser's output. This investigation proposes an orthogonal-polarization optical feedback (OPF) method to suppress mode hopping in semiconductor lasers. Experimental results indicated that, under some operating conditions, mode hopping could be completely suppressed by an OPF of around -29.3 dB in feedback ratio while the laser was conducted into a single-mode state. Moreover, the mode-hopping region was significantly reduced, enabling the laser's wavelength to be tuned continuously over a wider range. These results can be used to greatly improve the performance of semiconductor lasers. 相似文献