双向泵浦钛宝石脉冲激光的多通放大

从基本理论出发,系统地计算分析了双向泵浦钛宝石激光放大器的增益特性,进而采用新的放大构型完成了啁啾脉冲八通放大实验,放大总增益近106,输出脉冲能量达0.8mJ。     

双向泵浦钛宝石脉冲激光的多通放大

 从基本理论出发，系统地计算分析了双向泵浦钛宝石激光放大器的增益特性，进而采用新的放大构型完成了啁啾脉冲八通放大实验，放大总增益近10⁶，输出脉冲能量达0.8mJ。     

双向抽运钛宝石啁啾脉冲激光多通放大的理论与实验研究

以双向抽运方式为基点，提出了新的、更接近实际的多通放大计算模型与方法，系统地计算分析了共焦腔双向抽运钛宝石激光放大器的放大特性，进而采用新的放大构型完成了啁啾脉冲多通放大．将实验结果与理论计算进行了比较，两者符合得很好．这种放大器大大减少了放大次数并彻底避免了再生腔必需的诸多光电元件 关键词：     

飞秒超强激光多通预放大过程中的脉冲信噪比研究

从啁啾脉冲放大的基本理论出发,详细计算了啁啾脉冲在多通预放大中各个时间点的增益情况,并设计了一个十通预放大器进行了实验研究. 结果显示,在抽运通量为1.6 J/cm²的非饱和放大情况下,种子脉冲经过十通预放大之后信噪比由10^-5提高到10^-7. 这表明在非饱和抽运通量下,多通预放大器可以有效提高激光脉冲的信噪比. 关键词： 多通预放大 信噪比 飞秒钛宝石激光器     

双向泵浦钛宝石的四通放大器

 由多通放大器的理论计算了脉冲的放大特性,并进行了钛宝石的四程放大实验。当输入信号光为1mJ时,通过四程放大,获得了20mJ的脉冲输出。     

双向泵浦钛宝石的四通放大器

由多通放大器的理论计算了脉冲的放大特性,并进行了钛宝石的四程放大实验。当输入信号光为1mJ时,通过四程放大,获得了20mJ的脉冲输出。     

用钛宝石再生放大器产生高重复率啁啾脉冲列

针对啁啾脉冲放大技术建成的钛宝石激光装置，提出一种获得高重复率激光脉冲列的方法.通过改变钛宝石再生放大器中泡克耳斯盒电光开关的传统工作模式，使得腔内放大的脉冲从某特定时刻起，每当在腔内往返一次就以一定的倒出比例（倒出率）倒出腔内脉冲能量的一部分，从而可以在有限的时间段内产生高重复率的啁啾激光脉冲列.基于Franz-Nodvik放大理论，建立了该高重复率再生放大器的理论模型，通过数值计算，系统地分析了初始增益、倒出时刻、倒出率对输出的脉冲序列的影响.在抽运功率为35mJ、倒出率为1/2的实验条件下，通过腔外的脉冲数量选择器，在一个抽运周期内的有限时间段内已获得了14个幅度相近、单脉冲能量约为0.02mJ、重复率为100MHz的啁啾脉冲序列.从此啁啾脉冲列中选取数个脉冲，通过10TW级的激光系统放大和压缩，已获得100MHz重复率的飞秒太瓦级脉冲列. 关键词： 高重复率 多通放大 啁啾脉冲放大 钛宝石激光器     

钛宝石飞秒激光的啁啾脉冲再生放大

根据多通放大理论计算分析了再生放大器的激光放大特性,并采用啁啾脉冲放大技术完成了钛宝石飞秒脉冲激光的再生放大实验,获得了2mJ的输出脉冲能量,增益大于106,对有关现象作了讨论。     

钛宝石飞秒激光的啁啾脉冲再生放大

根据多通放大理论计算分析了再生放大器的激光放大特性，并采用啁啾脉冲放大技术完成了钛宝石飞秒脉冲激光的再生放大实验，获得了２ｍＪ的输出脉冲能量，增益大于１０６，对有关现象作了讨论。     

可调谐窄线宽钛宝石激光脉冲的放大和频率展宽

在频域上进行了光参变激光器对钛宝石激光脉冲作选取放大并频率扩展的理论分析和数值模拟。实验上实现了用BBO光学参变振荡器作钛宝石激光脉冲选取、频率展宽为120nm的连续可调谐窄线宽（小于0.02nm）激光输出。     

Spatial chirp in Ti:sapphire multipass amplifier

The spatial chirp generated in the Ti:sapphire multipass amplifier is numerically investigated based on the onedimensional(1D) and two-dimensional(2D) Frantz–Nodvik equations. The simulation indicates that the spatial chirp is induced by the spatially inhomogeneous gain, and it can be almost eliminated by utilization of proper beam profiles and spot sizes of the signal and pump pulses, for example, the pump pulse has a top-hatted beam profile and the signal pulse has a super-Gaussian beam profile with a relatively larger spot size. In this way, a clear understanding of spatial chirp mechanisms in the Ti:sapphire multipass amplifier is proposed, therefore we can effectively almost eliminate the spatial chirp and improve the beam quality of a high-power Ti:sapphire chirped pulse amplifier system.     

灯泵钛宝石激光器调Q运转

论述了色散棱镜谐振腔调Q运转方法。其中棱镜既起到波长调谐色散元件的作用 ,又起到Q开关起偏器的作用 ,省掉了制作难度大的宽带起偏器。为了使晶体高压随波长调谐同步运转 ,采用了单片机控制全反射镜驱动电源 ,同时也控制调Q电压 ,使全反射镜的转动与施加在晶体上的高压同步运行 ,达到了宽带调谐与调Q电压同步运转的目的 ,获得了波长调谐巨脉冲激光。实验中应用精确数字退压延迟技术和晶压与波长调谐同步运转方法 ,获得了激光脉宽 31ns、能量 2 70mJ的结果     

Temporal characteristics of Ti: sapphire laser pumped synchronously by bounded pulse train

A Ti: sapphire laser pumped synchronously by a bounded frequency-doubled pulse train of a pulsed mode-locked Nd : YAG laser was presented. The temporal characteristics of the laser and optimal conditions of generating stable ultrashort pulses are also given.     

Broadband spectral shaping in a Ti:sapphire regenerative amplifier

A birefringent crystal quartz plate of known thickness has been used as a spectral filter for spectral shaping in a Ti:sapphire regenerative amplifier. The spectral profile of the amplified pulse ejected from the regenerative amplifier was observed while adjusting the birefringent crystal plate in the cavity. By altering the gain spectrum, the bandwidth of the regeneratively amplified pulse was increased from 18 to 35 nm by using a 0.34-mm thick birefringent plate. The output pulse spectrum from the regenerative amplifier neared the bandwidth of the seed pulse. As a comparison, we used a coated filter outside the regenerative amplifier cavity, and the bandwidth of the regeneratively amplified pulse was stretched to 28 nm. When the bandwidth was stretched to 35 nm, the pulse was compressed to 35 fs.     

闪光灯泵浦钛宝石可调谐激光器

为了提高灯泵钛宝石激光器的输出能量和效率，对灯泵钛宝石激光器进行了大量的试验研究工作。对国产氙灯进行了快速放电和寿命试验；测得了在不同放电电流密度情况下的氙灯发光光谱分布；试验采用双灯串接泵浦，双棱镜色散光学谐振腔，平平腔型，调谐范围为７５０～９５０ｎｍ，在中心波长８００ｎｍ处得到激光输出能量为８９３ｍＪ，电光转换效率为０．８９％。该激光器的阈值约为１５Ｊ。     

PW级掺钛蓝宝石激光放大器中横向寄生振荡控制

 介绍了目前世界上在建的第一台掺钛蓝宝石激光系统中大口径晶体内横向寄生振荡的抑制方法。采用一种掺炭的热塑料MeltMount 1.704作为折射率匹配材料，掺入炭粉作为吸收体。理论上它可以将晶体中的寄生振荡阈值从13增加到2100。     

Ti:sapphire Regenerative Amplifier at 1.056 μm

The design and performance of a Ti:sapphire regenerative amplifier operating at 1. 056 μm are described. A laser pulse with an initial pulsewidth of 100 fs is amplified to ≥1.5 mJ in the amplifier after firstly stretched to 850 ps. The amplified pulse can be re-compressed to ～300 fs with energy of ～1 mJ. Loss of the spectrum happens in the regenerative cavity since bandwidth of the coat of optics in the cavity is not enough adequate.     

采用飞秒光纤激光同步泵浦的自启动锁模钛宝石激光研究

针对常规连续激光泵浦钛宝石激光振荡器不能自启动锁模的缺点,采用倍频飞秒光纤激光同步泵浦,通过调节振荡器腔长与泵浦腔长匹配,实现了飞秒钛宝石激光的自启动锁模。实验中采用3.4 W的倍频掺镱光纤激光同步泵浦钛宝石激光振荡器,获得了平均功率大于130 mW、重复频率75 MHz、光谱宽度大于47 nm、脉冲宽度17 fs的锁模脉冲输出,不仅能够稳定可靠地实现自启动锁模,解决了常规钛宝石激光振荡器锁模启动的困难,而且还具有同步输出1040,800,520 nm三束飞秒激光的特点,为进一步开展飞秒激光相干合成以及光参量放大等研究提供了优势基础。     

Beam overlapping in a multipass Ti:sapphire amplifier based on a parabolic mirror

According to laser beam transporting in a multipass Ti:sapphire amplifier based on a parabolic mirror, the influential factors to induce astigmatism are analyzed. The beam waists of the laser beam transporting in the multipass amplifier are calculated by ABCD law in sagittal and tangential planes, respectively, and are compared with each other. Our analyses of these influential factors provide valuable data to optimize this design of multipass Ti:sapphire amplifier, and our experimental results of getting Gaussian beam from such a kind of amplifier confirmed our theoretical analyses.