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TW级Ti:Al2O3飞秒激光放大器 总被引:5,自引:0,他引:5
报道TW(10^12W)级Ti:Al2O3飞秒激光放大器的研究,采用Ti:Al2O3自锁模激光振荡器和脉冲啁啾放大技术,获得了能量为84mJ,脉宽为75fs的放大光脉冲,峰值功率达到TW量级。 相似文献
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用光纤传输激光的方法实现激光扫描雕刻 总被引:1,自引:0,他引:1
利用扩束镜和聚焦透镜的组合,把峰值功率高达二百多千瓦的调QYAG激光耦合到光纤中,并用双透镜将光纤输出端的出射激光聚焦,成功地应用在光纤传输激光雕刻机中。 相似文献
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用准连续60W的二极管激光列阵侧面泵浦“之”字形Nd:YAG板条激光器,当泵浦功率为45W,脉宽为400μs时,得到3.5mJ的激光输出。用KD*P电光开关调Q,得到18ns(FWHM)、2mJ的脉冲激光输出,用KTP晶体作腔内倍频,得到15ns、0.85mJ的二次谐波激光输出。在腔内无调Q元件且腔长小于5cm时,于近阈值处得到单频绿光输出,而当泵浦功率稍大,腔内有数个纵模振荡时,观察到激光的反相态,并用数值模拟的结果对此作了解释。 相似文献
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利用扫描电镜对波长为1.06μm脉宽为10ns的Nd:YAG脉冲激光辐照金属Al和半导体GaAs产生的表面形貌变化进行了观察,对不同背景气压下液体的溅射现象进行了分析。实验结果表明,液体的溅射速度和距离随着背景气压的降低而增加。在某些特定的实验条件下,在激光烧蚀GaAs的表面上出现了等间距的波纹结构。理论分析发现,这些波纹是由横向表面声波造成的。这些周期性结构的出现与激光功率密度和背景气压密切相关。 相似文献
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二极管激光侧面泵浦腔同人倍频Nd:YAG板条激光顺研究 总被引:1,自引:0,他引:1
用准连续60W的二极管激光列阵侧面泵浦“之”字形Nd:YAG板条激光器,当泵浦功率为45W,脉宽为400μs时,得到3.5mJ的激光输出。用KD.P电光开关调Q,得到18ns、2mJ的脉冲激光输出,用KTP晶体作腔内倍频,得到15ns、0.85mJ的二次谐波激光输出。 相似文献
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随着激光技术的快速发展,激光功率有了很大的提高,这对于光电探测系统来说是一个致命的威胁。任何一种薄膜在激光功率超过薄膜的损伤阈值时,薄膜就被破坏,光电系统就要面临失效。目前尚未见薄膜损伤时间测量的报道。文中研究不同功率激光辐照薄膜的损伤时间。 相似文献
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蓝紫激光和中红外激光在基础研究和国防工程中有重要的应用前景。单光子吸收的碱金属蒸气激光器具有量子效率高、受激发射截面大和热管理性能好等优点,近些年来已成为激光领域中研究热点之一,目前已实现k W量级的输出。双光子吸收的碱金属蒸气激光器可实现蓝紫激光和中红外激光级联输出的特性,也引起越来越多的关注。本文从碱金属原子密度、泵浦光功率、偏振和频率失调量以及调控激光等几种影响因素出发,综述了双光子吸收碱金属蒸气激光的研究进展,在此基础上分析了影响激光输出特性的原因,最后对双光子吸收碱金属蒸气激光器的发展趋势进行了展望。 相似文献
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We propose and demonstrate a simple approach to lower the thermal quenching
effect and improve the output power of Cr:LiSAF lasers, which is
accomplished by employing two laser rods. The resonator contains two laser
rods and is designed by using two ``X' folding cavities in cascade. A tunable
laser output of $\sim $ 180\,mW has been achieved with the pump of single-striped
laser diodes. Compared with lasers using single gain rod, the laser with
dual rods shows less severe thermal effect and increases the output by more
than two times. 相似文献
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A control system which can improve stabilization of laser power in long-term operation automatically is designed for a deuterium cyanide (DCN) far-infrared laser interferometer on the Experimental Advanced Superconducting Tokamak. It stabilizes the output power of the laser by a closed-loop control system aided by a programmable logic controller. The system has been applied to the DCN laser and it has been proven that it is effective in stabilizing the laser near the highest scope of the output power. 相似文献
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H. Y. Shen R. F. Wu Z. D. Zeng W. X. Lin R. R. Zeng Y. P. Zhou G. F. Yu C. H. Huang 《Chinese Journal of Lasers》2000,9(2):103-106
1 IntroductionNd: YLF crystal belongs tO the tetragonal syStem with space group 1 4/ a and it isa POSitive single axial crystal in optics. The life-time Of fluorescence of Nd3 ions incaF crystal is lOnger, being 520 us. Therefore, it is a strong candidate for lasermedium of high stored energy and CW lasers. Especially, the therrnai focal distance OfNd: YLF crystal is much longer than that of Nd: YAG crystal and' so the Nd: YLFcrystal is Particularly suitable for a laser in TEWo m… 相似文献
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H. Y. Shen R. F. Wu Z. D. Zeng W. X. Lin R. R. Zeng Y. P. Zhou G. F. Yu C. H. Huang 《中国光学快报(英文版)》2000,9(2)
A laser diode (LD) pumping high-stability 1047 nm TEM00 mode Nd: YLiF4 (Nd: YLF) continuous wave (CW) laser is reported in this letter. The laser output power of 5.83 W with optical to optical effidency of 27% and slope efficiency of 30% has been achieved The instability of output power is 0.36% and spike caused by relaxation oscillation has not been observed in the laser beam. The transverse cross section of laser beam is an ellipse, the diameters of laser beam at output mirror in both directions are 0.97 mm and 1.07 mm, respectively. The divergent angles are 0. 936 mrad and 0. 774 mrad, and the values of M2 are 1.37 and 1.24, respectively. The polarization degree of laser beam is better than 237:1. 相似文献
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新型全固态激光器作用过程中的激光参数分析 总被引:1,自引:0,他引:1
对影响LD泵浦的Nd∶GdVO4,Nd∶YVO4和Nd∶YAG激光器输出特性的增益介质长度、腔内损耗、输出镜透过率、泵浦光和振荡光的光斑大小进行了分析和数值模拟。当腔内固有损耗为2%,输出镜透过率为10%时,Nd∶Gd-VO4,Nd∶YVO4和Nd∶YAG晶体的振荡阈值分别为1.77W、0.55W和3.34W。在25W泵浦功率下,利用1mm长的Nd∶GdVO4,Nd∶YVO4和Nd∶YAG晶体可分别得到13.17W,13.26W和8.43W的输出功率,相应的输出镜最佳透过率分别为24%,44%和16%。 相似文献